The Chlorine anlon provides a strong attraction to the potassium ion. That is option A.
What is an anion and a cation?An anion is defined as the negatively-charged ions which means that they have more electrons than protons due to having gained one or more electrons.
A cation is defined as the positively-charged ions which means that atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons.
The potassium is a cation while the chlorine atom is an anion in the crystal salts.
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need help on this chemistry question please.
The theoretical yield of AlCl₃ is 28.65g and percentage yield is 33.15%.
What is yield of a reaction?
In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.
Theoretical yield of a reaction is calculated assuming that there is no error in the reaction procedure. Percentage yield can be calculated by the formula-
%Yield = (Actual yield ÷ theoretical yield) ×100
Given,
Mass of Al(OH)₃ = 50.3g
According to reaction given,
78g Al(OH)₃ gives - 44.44g AlCl₃
1g Al(OH)₃ gives - 0.56g AlCl₃
Then, 50.3g Al(OH)₃ gives - 0.56×50.3 = 28.65g AlCl₃
%Yield = (9.5÷28.65) × 100
Therefore, the theoretical yield of AlCl₃ is 28.65g and percentage yield is 33.15%.
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280Cm3 of a gas diffuse in 40 seconds and 350Cm3 of another gas diffuse in 10 seconds. calculate the rate of diffusion of two gases
The rate of diffusion of two gases is 7 cm³/sec and 35 cm³/sec respectively.
What is rate of diffusion?The rate of diffusion is the amount of gas passing through the an area in unit time.
The diffusion rate depends on several factors:
the concentration gradient (the increase or decrease in concentration from one point to another); the amount of surface area available for diffusion; and the distance the gas particles must travel.Given,
Volume of first gas = 280 cm³
Time of first gas = 40 seconds
Volume of second gas = 350 cm³
Rime of second gas = 10 seconds
Rate of diffusion = volume of gas diffused ÷ time
Rate for first gas = 280 ÷ 40
= 7 cm³/sec
Rate of second gas = 350 ÷ 10
= 35 cm³/sec
Therefore, The rate of diffusion of two gases is 7 cm³/sec and 35 cm³/sec respectively.
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2.76 Provide the name or chemical formula, as appropriate, for
each of the following acids: (a) hydroiodic acid, (b) chloric
acid, (c) nitrous acid, (d) H2CO3, (e) HClO4, (f) CH3COOH.
Hydroiodic acid - HI
Chloric acid - HClO3
Nitrous acid - HNO2
H2CO3 - Carbonic acid
HClO4 - Perchloric Acid
CH3COOH - Acetic acid
How do you know the name of a chemical compound?The name of a chemical compound is typically determined by its chemical formula and the rules of nomenclature, which provide a systematic way of naming compounds based on their composition and structure.
The name of an ionic compound is usually composed of the name of the cation followed by the name of the anion. The cation is typically named first and is usually the name of the metal element or the polyatomic ion.
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What is the percent yield
Help!!!
The percent yield for this reaction of oxygen with Iron, would be 73. 2 %.
How to find the percent yield ?The percentage yield in a reaction can be found by the formula :
= Actual yield / Theoretical yield x 100 %
Theoretical yield of iron (III) oxide = 12.3 g
Actual yield of iron (III) oxide = 9.00 g
The percentage yield is therefore ;
= 9. 00 / 12. 3 x 100 %
= 0.732 x 100 %
= 73. 2 %
In conclusion, the percent yield is 73. 2 %.
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(4) If 144. kJ of energy were removed from 55.0 g of water vapor at 100 deg * C what would be the final temperature of the water?
The final temperature of the water is 100°C - 63.4°C = 36.6°C. Temperature can affect the physical and chemical properties of substances, including their volume, pressure, and reactivity.
What is Temperature?
Temperature is a measure of the average kinetic energy of the particles in a substance. In other words, it is a measure of how hot or cold a substance is. Temperature is usually measured in units of degrees Celsius (°C) or degrees Fahrenheit (°F), or Kelvin (K) in the scientific context. The Celsius and Fahrenheit scales are based on the freezing and boiling points of water, while the Kelvin scale is based on the absolute zero point where all molecular motion ceases.
q = m·C·ΔT
where q is the heat transferred, m is the mass of the substance, C is the specific heat capacity, and ΔT is the change in temperature.
First, we need to determine the initial temperature of the water. We know that the water vapor is at 100°C, which is also the boiling point of water at standard pressure. Therefore, we can assume that the water vapor is in equilibrium with liquid water at 100°C. The heat required to convert 55.0 g of water at 100°C into water vapor at 100°C can be calculated as follows:
q1 = m·ΔHv
q1 = 55.0 g · 2257 J/g = 124,135 J
This means that 124,135 J of heat were absorbed by the water to vaporize it at 100°C.
Next, we need to determine the amount of heat that is removed from the water vapor. We know that 144 kJ of energy were removed from the water vapor. This can be converted to joules as follows:
q2 = 144 kJ · 1000 J/kJ = 144,000 J
Now, we can use the equation to find the final temperature of the water:
q1 + q2 = m·C·ΔT
where ΔT is the change in temperature, which is what we want to find.
First, we need to determine the total mass of the water vapor and liquid water:
m = 55.0 g + 124,135 J / 2257 J/g = 108.3 g
Next, we need to determine the specific heat capacity of water at constant pressure. This is approximately 4.18 J/g·°C.
Now we can substitute these values into the equation and solve for ΔT:
144,135 J + 144,000 J = 108.3 g · 4.18 J/g·°C · ΔT
ΔT = (144,135 J + 144,000 J) / (108.3 g · 4.18 J/g·°C) = 63.4°C
Therefore, the final temperature of the water is 100°C - 63.4°C = 36.6°C.
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Consider the reaction:
CH4 + 2 O2 → CO2 + 2 H2O
Select the true statement:
1. 4.00 moles of CH4 will react with 2.00
moles of O2.
2. The limiting product is CO2.
3. The limiting reactant is CO2.
4. 8.00 moles of O2 can react to produce 144.0 g of H2O.
5. 4.00 moles of O2 can react to produce 4.00 moles of CO2.
6. 88.01 g of CO2 could be produced upon reaction of 64.00 g of O2.
5. 4.00 moles of O2 can react to produce 4.00 moles of CO2.
What is the relationship between moles of O2 and moles of CO2?
The balanced chemical equation shows that 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2 and 2 moles of H2O.Therefore, 4 moles of CH4 would react with 8 moles of O2 to produce 4 moles of CO2.Since the ratio of O2 to CO2 is 2:1, 4 moles of O2 would react with 2 moles of CH4 to produce 2 moles of CO2.Therefore, statement 5 is true: 4.00 moles of O2 can react to produce 4.00 moles of CO2.According to the balanced chemical equation, the ratio of moles of O2 to moles of CO2 is 2:1, which means that 4 moles of O2 would react with 2 moles of CH4 to produce 2 moles of CO2. Therefore, statement 5 is true.
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3. When your body fills with extra electrons and you touch a good conductor, you get a shock. Is this
shock an example of static electricity or an electrical current? Explain your answer. (Hint: Review
the definitions of static and current.)
Answer:
Static Electricity
Explanation:
The shock that you feel when your body fills with extra electrons and you touch a good conductor is an example of static electricity, not an electrical current.
Static electricity is an imbalance of electric charges within or on the surface of a material. When two objects with different electric charges come into contact, such as your body and a good conductor, electrons can transfer from one object to another, resulting in a buildup of static electricity. When the electrical potential difference between the two objects becomes high enough, the electrons can jump across the gap in the form of a spark, creating a sudden discharge of static electricity, or shock.
In contrast, an electrical current is a continuous flow of electric charge through a conductor, such as a wire. Electrical currents are typically created by the movement of electrons or ions, and they are the basis for most forms of electrical energy and power.
So, the shock that you feel when your body fills with extra electrons and you touch a good conductor is an example of static electricity because it involves a buildup of electric charge that is released suddenly in the form of a spark or shock.
If the initial rate does not double nor stay the same (as in it times itself by 1.1-1.9 times) then is the exponent to the power of 1 or to the power of 0?
The exponent to the power of 0 would be the correct answer in this situation.
What is initial rate?Initial rate is the rate of reaction at the beginning of a chemical reaction. It is usually measured at the start of the reaction and is usually higher than the rate at equilibrium. The initial rate is an important factor in determining the rate of reaction and the products of the reaction. It can be used to determine the effects of various factors such as temperature, pressure, and concentration on the reaction rate.
Exponents represent the number of times the base number is multiplied by itself. So, if the rate does not double nor stay the same, then it is not being multiplied by itself, so the exponent would be to the power of 0.
Exponentiation can be used to show how many times a number is multiplied by itself, and this is done by raising the base number to a certain power. For example, 4 to the power of 3 means 4 x 4 x 4 = 64. In this case, the exponent is 3.
If the initial rate does not double nor stay the same, then the power associated with the exponent would be 0. This is because the rate is not being multiplied by itself, so it would not be associated with any power. Therefore, the exponent would be to the power of 0.
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Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy. Calculate the moles of ammonium perchlorate needed to produce .075mol of water.
Thus, in order to make 0.075 mol of water, 0.0375 moles or ammonium perchlorate are required.
How licit is ammonium perchlorate?Perchlorate can be purchased by any qualified specialists who plan to utilize the substance legally. Since this molecule and all of its derivatives are compounds requiring extremely professional expertise in handling, the procurement and handling of item must be subject to a number of laws.
What purposes does ammonium perchlorate serve?An odorless, white, dust powder known as ammonium perchlorate. As an etching and etching agent, it is employed in analytical chemistry. Moreover, it is utilized in explosives and for animal fattening. According to DOT and NFPA citations, ammonium perchlorate is listed as a hazardous substance.
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If 25.82 mL of 0.0500 M NaOH solution are required to reach the equivalence point of an acid-base titration of 40.0 mL of 7-Up, how many moles of NaOH were required?
If 25.82 mL of 0.0500 M NaOH solution are required to reach the equivalence point of an acid-base titration of 40.0 mL of 7-Up, the number of NaOH required is 0.00126 moles.
What is equivalence point?The point at which chemically identical amounts of reactants are put together is known as the equivalence point in a chemical reaction.
In other words, during titration, it is the point at which the titrant addition is sufficient to totally neutralize the analyte solution. The number of moles of a solution with an unknown concentration is equal to the number of moles of a titrant, or standard solution. Because it is a point where the amount of acid and base required to neutralize a solution is equal, it is often referred to as the stoichiometric point. It should be noted that the acid to base ratio need not be 1:1. The balanced acid-base chemical equation explains this acid-base ratio. For this, indicators might be used, for example, phenolphthalein or methyl orange.
The reaction between citric acid and NaOH is,
H₃C₆H₅O₇(aq) + 3NaOH(aq) → Na₃C₆H₅O₇(aq) + 3H₂O(l)
According to the formula,
M = [tex]\frac{n}{V}[/tex]
where,
M is the molarity,
n is the number of moles and,
V is the volume(L)
For NaOH;
M = 0.0500 M
V = 25.82ml = 0.02582 l
n = M × V
n = 0.00126 moles
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If 25.0 grams of carbon (graphite) and 66.6 grams of oxygen combine to form carbon dioxide, how many grams of carbon dioxide must form?
According to the question 88.4 grams of carbon dioxide must form.
What is carbon dioxide?Carbon dioxide is a colorless, odorless, non-toxic gas composed of two oxygen atoms and one carbon atom. It is a natural component of Earth's atmosphere and is produced through natural processes such as respiration and combustion. It is also produced artificially through processes such as burning fossil fuels and manufacturing. Carbon dioxide plays an important role in regulating the Earth's climate.
The reaction equation for the formation of carbon dioxide is:
C (graphite) + O2 → CO2
To find the amount of carbon dioxide that must form, we must multiply the number of moles of carbon (graphite) by the molar mass of carbon dioxide (44.01 g/mol).
25.0 g C × (1 mol C / 12.01 g C) × (44.01 g CO2 / 1 mol CO2) = 88.4 g CO2
Therefore, 88.4 grams of carbon dioxide must form.
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Determine if each set of the quantum numbers is allowed or not allowed.
1). n = 3, l = 1, ml = −2, ms = +1/2
2). n = 4, l = 3, ml = −1, ms = −1/2
3). n = 0, l = 2, ml = 1, ms = −1/2
The energy, size, orientation, or spin of an electron within an atom are all described by quantum numbers. When giving these quantum numbers values, specific guidelines and limitations must be followed.
What are the four quantum numbers?There are a collection of four quantum numbers in atoms: the main quantum number (n), its orbital rotational inertia fractional number (l), the spin quantum number (mm), and the electron quantum number (ms = +1/2).
This collection of complex numbers is permitted since the primary quantum number, n = 3, the azimuthal fractional number, l = 1, the spin quantum amount, ml = -2, and the modulus, ms = +1/2, are all permissible values.
n=4, l=3, ml=-1, and ms=-1/2
This set set quantum numbers is permitted because the main quantum number, n, has a valid value of 4, the azimuthal fractional number, l, a valid value of 3, the spin quantum number, ml, a valid value of 1, and the spin quantum number, ms, a valid value of -1/2.
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What are the steps to making electricity with a generator? sort them in order
1. electron creates a current of electricity
2. mechanical energy spins a turbine
3. a magnetic field moves electrons in a conductor
4. a turbine spins a magnet creating disturbances in a magnetic field.
Mechanical energy spins a turbine, a turbine spins a magnet creating disturbances in a magnetic field, a magnetic field moves electrons in a conductor, electron creates a current of electricity are the steps to making electricity with a generator.
What is electric field ?
According to mathematics, the electric field is described as a vector field that may be connected to each point in space and represents the force per unit charge that is applied to a positive test charge that is at rest at that location. Either the electric charge or time-varying magnetic fields can produce an electric field.
What is energy?
The capacity to work comes from energy. Energy types include chemical, nuclear, and electrical energy. Science and engineering both depend on the idea of energy. Here is a look at the classification of energy as well as its description and examples.
Therefore, Mechanical energy spins a turbine, a turbine spins a magnet creating disturbances in a magnetic field, a magnetic field moves electrons in a conductor, electron creates a current of electricity re the steps to making electricity with a generator.
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Answer:
The correct order of the steps to making electricity with a generator is:
Mechanical energy spins a turbine.A turbine spins a magnet creating disturbances in a magnetic field.A magnetic field moves electrons in a conductor.Electrons create a current of electricity.First, mechanical energy is used to spin a turbine, which is typically connected to a magnet. As the turbine spins the magnet, it creates disturbances in a magnetic field. These disturbances then cause the magnetic field to move electrons in a nearby conductor, such as a wire. This movement of electrons creates a flow of electrical current through the wire, which can be used to power various devices. Therefore, the final step is the production of electricity, as electrons flow through the conductor and create a current of electricity.
balancing equation: Solid iron is added into aqueous copper(II) chloride to produce aqueous iron(III) chloride and solid copper.
The balanced chemical equation for the reaction is: Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)
What is the balanced chemical equation?The equation shows that one mole of solid iron reacts with two moles of aqueous copper(II) chloride to produce two moles of aqueous iron(III) chloride and one mole of solid copper.
To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Here's how we balance the equation:
Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)
On the left-hand side, we have one iron atom (Fe) and two copper atoms (Cu). On the right-hand side, we have two iron atoms (Fe) and one copper atom (Cu). To balance the iron atoms, we add a coefficient of 2 in front of Fe(s) on the left-hand side:
2Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)
Now we have two iron atoms on both sides. However, we also have four chloride ions (Cl-) on the left-hand side and six chloride ions on the right-hand side. To balance the chloride ions, we add a coefficient of 3 in front of CuCl2(aq) on the left-hand side:
2Fe(s) + 3CuCl2(aq) → 2FeCl3(aq) + Cu(s)
Now we have two iron atoms, six chloride ions, two copper ions (Cu2+), and one copper atom on both sides. The equation is balanced!
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what is an ionic equation for sodium hydroxide and calcium carbonate
An ionic equation for sodium hydroxide and calcium carbonate is Na⁺ + OH⁻ + Ca²⁺ + CO₃²⁻[tex]\rightarrow[/tex]Na⁺ +CO₃²⁻ + Ca²⁺ + OH⁻.
What is ionic equation?Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.
An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.
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The mass of sodium acetate produced in the following reaction is 123 grams. NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2 What mass of carbon dioxide and water are produced? Show how you get the answer 66 g CO , 27 g H2O
Thus, the mass of carbon dioxide created is 66.02 g, while the volume of water produced was 27.03 g.
How does carbon dioxide affect the body?Many health impacts from CO2 exposure may occur. These symptoms could include a coma, hypoxia, convulsions, sweating, disorientation, restlessness, a tingling and pins-and-needles sensation, difficulty breathing, fatigue, increased heart rate, and high blood pressure.
Are people harmed by carbon dioxide?Through inhalation, CO2 is regarded as having low toxicity. CO2 behaves like a basic asphyxiant, which is what causes the majority of its negative health impacts. A gas known as a simple asphyxiant lowers or replaces the typical oxygen in breathing air. Headache and sleepiness are two signs of modest CO2 exposure.
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PLA HELP ASAP
(50 POINTS)
The graph shows a steady increase of atmospheric carbon
dioxide. At the current rate of carbon dioxide being released into
the atmosphere, it should reach 420 parts per million by year
2030.
How does this contribute to the greenhouse effect?
The planet will return to normal because of the
amount of carbon dioxide.
The planet will have the same temperature because
of the amount of carbon dioxide.
The planet will get colder because of the amount of
carbon dioxide.
The planet will get warmer because of the amount of
carbon dioxide.
Why is a different product formed at the anode when copper sulfate is electrolysed using graphite electrodes rather than copper electrodes?
salt is a solid but it can dissolve in a liquid. HOW?
Answer:
When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.
Explanation:
its like cotton candy in water
AWater can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance
Explanation:
What mass of potassium nitrate is needed to generate 239.0 L of gas, composed of 105.0 L of N2 and 134.0 L of O2 at 0.920 atm and 287 K, using these two reactions?
Mass of potassium nitrate is needed to generate 215.0 L of gas, composed of 111.0 L of N₂ and 104.0 L of O₂ at 0.920 atm and 291 K, using these two reactions is 1186.75 g.
What is the purpose of potassium nitrate?Potassium nitrate is a crystalline (sand-like), clear, white, or colorless powder or solid with a salty, pungent flavor. It is employed in the production of glass, rocket fuel, fireworks, fertilizer, explosives, and matches. Due to DOT's citation, potassium nitrate is included on the Hazardous Substance List.
The reactions are :
2KNO₃ ---> 2KNO₂ + O₂
4KNO₂ ----> 2K₂O + 3O₂ + 2N₂
Therefore,
4KNO₃ ----> 2K₂O + 5O₂ + 2N₂
using the formula:
PV = nRT
moles of N₂ = PV / RT
P = 0.920 atm
T =287 K
R = 0.082 Latm/mol/k
moles of N₂ = 4.279 mol
moles of O₂ = (0.92 × 134) / 0.082 × 287 = 123.28 / 23.534
= 5.24 mol
from the equation .
moles of potassium nitrate to produce nitrogen = 2 × 4.279
= 8.55 mol
moles of nitrate tp produce oxygen = (4 / 5) × 4
= 3.2 mol
total moles of nitrate = 8.55 mol + 3.2 mol
= 11.75 mol
mass of potassium nitrate = number of moles × molar mass
= 11.75 × 101
= 1186.75 g
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What do these two changes have in common baking cookies and using polish to remove tarnish from a silver spoon?
Answer: Both are Chemical changes.
Explanation: When you bake a cookie, you start out with a mixture of ingredients. These can include substances such as Baking Soda. When high heat is applied to Baking Soda, it starts to break down into Carbon Dioxide. This is an example of a chemical change because a new substance is formed. Proteins also break down at high heat in an oven resulting in a chemical change.
For the second change, a chemical reaction might help you visualize what's going on. 3 Ag2S(s) + 2 Al(s) ---> 6 Ag(s) + Al2S3(s) is the reaction that's occuring. We can clearly see that the products are different substances than the reactants indicating a chemical change.
To review, chemical changes are changes that result in the alteration of the structure of a substance which leads to the production of a new substance.
Hope this helps!
how many molecules in 3.72 moles of sulfur dioxide
Answer:
3,272,000
Explanation:
Find the number of molecules in 3.72 mol of sulfur dioxide: There are 78.54 g of nitrogen dioxide in 3.72 mol of sulfur dioxide, so there are 3,272,000 molecules in 3.72 mol of sulfur dioxide.
If a system has 375 kcal of work done to it, and releases 5.00×102 kJ of heat into its surroundings, what is the change in internal energy (Δ or Δ) of the system?
Δ= kJ
Explanation:
We need to use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system:
ΔU = q - w
First, we need to convert the units of work from kcal to kJ:
375 kcal × 4.184 J/kcal = 1570.5 J = 1.5705 kJ
Now we can plug in the values we have:
ΔU = (5.00×10² kJ) - (1.5705 kJ)
ΔU = 498.4295 kJ
Therefore, the change in internal energy of the system is ΔU = 498.4295 kJ.
The distance time graphs for two objects are shown below. Which statement is true?
A: Both objects move at variable speeds.
B: Both objects move at a constant speed.
C: Object A is moving at constant speed but Object B is moving at variable speed.
D: Object A is moving at variable speed but Object B is moving at constant speed.
As per the distance time graph object A is moving at variable speed but Object B is moving at constant speed.
What is speed?
The speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval;the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, miles per hour (mph).
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QUESTION 1
Which kind of atom is not found in a molecule of amoxicillin?
sulfur
oxygen
carbon
nickel
QUESTION 2
Which one of the following is a chemical change?
A tomato ripening on the vine
Yellow and red dye solutions mixing to make an orange solution
Making tea by placing a tea bag in hot water
Removing a green coating from copper coin with steel wool
7 points
QUESTION 3
You pour 35.4 mL of water into a graduate cylinder. You then place a 183.4 g sample of copper into the water and it quickly sinks to the bottom of the water. What is the new volume reading in the graduate cylinder?
7 points
QUESTION 4
Which one of the following is the best way to report the result of 36.51g / 47.0 mL?
0.777 g/mL
0.77g/mL
0.78 g/mL
0.8 g/mL
0.776 g/mL
7 points
QUESTION 5
Which one of the following atoms has can form a molecular compound with chlorine?
zinc
chlorine
sodium
argon
oxygen
7 points
QUESTION 6
How neutrons are in one Zn-71 atom?
41
7 points
QUESTION 7
Which is not the correct formula of an ionic compound?
LiClO2
AlCl4
Fe(NO3)3
Ag2SO4
NiS
7 points
QUESTION 8
In an ionic compound, strontium can form an ion with the same charge as an ion formed from..
radium
rubidium
sulfur
bromine
7 points
QUESTION 9
What is the chemical name of Ge2F6?
7 points
QUESTION 10
How many grams of iron are in 6.45 moles of iron?
360.20025
7 points
QUESTION 11
How many grams of bromine are needed to react with 155.2g of calcium to form calcium bromide?
7 points
QUESTION 12
A sample of a compound of S and F is found to contain 26.4g S and 78.2g F.
What could be the molecular formula of the compound?
SF
SF3
S2F10
S3F
Cannot be determined without the molecular mass of the compound.
7 points
QUESTION 13
Which sample contains the greatest number of atoms?
5g of Na
10g of K
10g of Na
5g of K
The correct answers are given below, based on the given prompt:
NickelRemoving a green coating from copper coin with steel wool36.0 mL0.776 g/mLOxygen38 neutronsAlCl4CalciumDigermanium hexafluoride360.2 g394.4 gS2F1010g of NaWhy is this so?Nickel as it is not an element in amoxicillin's molecular structure. Amoxicillin is a molecule composed of carbon, hydrogen, nitrogen, oxygen, and sulfur atoms.
The correct answer is Removing a green coating from copper coin with steel wool as it involves a chemical reaction where the green coating (copper oxide) is being reduced to copper metal by the iron in the steel wool.
The volume of water displaced by the copper sample is equal to the volume of the sample.
Using the density of copper (8.96 g/mL), the volume of the copper sample can be calculated as 183.4 g / 8.96 g/mL = 20.46 mL.
Thus, the new volume reading in the graduate cylinder is 35.4 mL + 20.46 mL = 55.86 mL or 56.0 mL (rounded to the nearest tenth).
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What is the molarity of a HCl solution that
contains 7.68 g of HCl in 253 mL of solution?
Answer in units of M. Answer in units of
M.
Answer:
The first step is to convert the given mass of HCl to moles:
moles of HCl = mass of HCl / molar mass of HCl
moles of HCl = 7.68 g / 36.46 g/mol
moles of HCl = 0.2103 mol
Next, we need to convert the given volume of solution to liters:
volume of solution = 253 mL = 0.253 L
Now we can calculate the molarity of the solution:
molarity = moles of solute / volume of solution
molarity = 0.2103 mol / 0.253 L
molarity = 0.831 M
Therefore, the molarity of the HCl solution is 0.831 M.
Explanation:
7.
What is the height of the parallelogram-
shaped pattern block shown below?
A=525 mm²
21 mm
The height of the parallelogram-shaped pattern block is 25 mm.
Heights calculation.
The formula to find the area (A) of a parallelogram is A = base x height.
In the given parallelogram-shaped pattern block, we are given the area A = 525 mm² and the base b = 21 mm (assuming the base is the bottom side of the parallelogram).
Using the formula, we can rearrange it to solve for the height h:
A = base x height
=> h = A / base
Substituting the given values, we get:
h = 525 mm² / 21 mm
h = 25 mm
Therefore, the height of the parallelogram-shaped pattern block is 25 mm using A = base x height.
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The height of the parallelogram-shaped pattern block can be calculated using the formula:
Area of parallelogram = base x height
What is the height of the parallelogram?We know that the area of the parallelogram is A=525 mm² and the base is 21 mm. We can rearrange the formula and solve for the height:
height = A / base
height = 525 mm² / 21 mm
height ≈ 25 mm
Therefore, the height of the parallelogram-shaped pattern block is approximately 25 mm.
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two gas containers are connected by a valve.the first container has a volume of 3L and contains oxygen at 10kpa. the second container has a volume of 5L and contains helium at 5kpa. Find the total pressure if the valve is opened and the gases are allowed to mix. show diagram as well.
The total pressure after the valve is opened and the gases mix is 6.875 kPa
What is ideal gas law?
The ideal gas law is a fundamental equation in physics and chemistry that relates the pressure, volume, temperature, and number of molecules of an ideal gas. The equation is expressed mathematically as:
PV = nRT
To find the total pressure after the valve is opened and the gases mix, we can use the ideal gas law, which states:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Assuming the temperature is constant and the gases behave ideally, we can write:
(P₁V₁+ P₂V₂) / (V₁+ V₂) = Ptotal
where P1 and V1 are the pressure and volume of the oxygen, P2 and V2 are the pressure and volume of the helium, and Ptotal is the total pressure after the valve is opened.
Plugging in the values, we get:
(P₁V1+ P₂V₂) / (V₁+ V₂) = Ptotal
((10kpa)(3L) + (5kpa)(5L)) / (3L + 5L) = Ptotal
(30kpa + 25kpa) / 8L = Ptotal
55kpa / 8L = Ptotal
Therefore, the total pressure after the valve is opened and the gases mix is 6.875 kPa (rounded to three significant figures).
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BASED ON TYPES OF CHEMICAL REACTIONS. CAN SOMEONE HELP WITH THIS QUESTION?✨
The following chemical equation can represent the reaction:
Mg (s) + FeSO4 (aq) → MgSO4 (aq) + Fe (s)
In this reaction, the magnesium metal (Mg) replaces the iron (Fe) in the iron (II) sulfate (FeSO4) solution to form magnesium sulfate (MgSO4) and elemental iron (Fe). This is an example of a single displacement or substitution reaction, where one element replaces another element in a compound.
What is a catalyst?A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. Catalysts provide an alternative pathway for the reaction that requires less energy to reach the desired products.
Give one example of a catalyst.Examples of catalysts include enzymes, which are biological catalysts involved in many biochemical reactions in living organisms, and transition metal complexes, commonly used in industrial chemical reactions.
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A 15 kg piece of zinc at 66◦C is placed in a
container of water. The water had a mass of
39 kg and a temperature of 17◦C before the
zinc was added.
What is the final temperature of water and
zinc? The specific heat of zinc is 388 J/kg ·
◦ C
and of water 4180 J/kg ·
◦ C.
Answer in units of ◦C.
The final temperature of the water and zinc mixture is 22.8◦C.
What is principle of conservation of energy?The principle of conservation of energy is a fundamental law of physics that states that the total energy of an isolated system remains constant over time. This means that energy cannot be created or destroyed; rather, it can only be transformed from one form to another. In other words, the total amount of energy in a system remains constant, even though it may change form or be transferred from one object to another.
This principle is a consequence of the laws of physics, and it applies to all natural processes. It is a fundamental principle of thermodynamics, which is the branch of physics that deals with the relationship between heat, energy, and work. According to this principle, energy can be converted from one form to another, such as from thermal energy to kinetic energy, but the total amount of energy in the system remains constant.
To solve this problem, we can use the principle of conservation of energy, which states that the total energy in a closed system remains constant. The energy gained by one object must be equal to the energy lost by the other object.
Let T be the final temperature of the water and zinc mixture. Then, the energy gained by the zinc is:
Q1 = mcΔT1
where m is the mass of the zinc, c is its specific heat capacity, and ΔT1 is the change in temperature of the zinc, given by:
ΔT1 = T - 66
The energy lost by the water is:
Q2 = mcΔT2
where m is the mass of the water, c is its specific heat capacity, and ΔT2 is the change in temperature of the water, given by:
ΔT2 = T - 17
According to the principle of conservation of energy, Q1 = Q2. Therefore, we have:
mcΔT1 = mcΔT2
Simplifying and solving for T, we get:
T = (mcΔT2 + 66cΔT1)/(mc)
Plugging in the given values, we get:
T = (39 kg x 4180 J/kg·◦C x (T - 17◦C) + 15 kg x 388 J/kg·◦C x (T - 66◦C))/(39 kg x 4180 J/kg·◦C + 15 kg x 388 J/kg·◦C)
Simplifying and solving for T, we get:
T = 22.8◦C
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