The molar quantity must be multiplied by Avogadro's number to be converted to moles or atoms.
How can a scientist use Avogadro's number?
One of the basic constants in chemistry is Avogadro's number. When the same amount of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of a given substance.
A material's mole is equivalent to 6.022 x 10²³of that substance (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the integer 6.022*10²³. The mole idea can be used to convert between particle mass and number.
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ANSWER ALL THE FOLLOWING
The molecular formula of a compound is a whole number multiple of its empirical formula. In molecular formula the actual number of atoms of various elements are depicted.
What is empirical formula?The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
Answer for Vth question:
a. C₅H₄
b. CH
Answer for VIth question:
a. Na₂SO₄ , Ca(NO₃)₂ = Reactants CaSO₄ , NaNO₃ = Products
b. Mg , N = Reactants Mg₃N₂ = Product
Answer for VIIth question:
a. 2Hg(NO₃)₂ (s) → 2HgO (s) + 4NO₂ (g) + O₂ (g)
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I've been trying to Understand what this problem met, along with I don't know which law I'm using
Can anyone help me out on this?
If 60.0 L of nitrogen is collected over water at 40.0 °C when the atmospheric pressure (total pressure) is 760.0 mm Hg, what is the partial pressure of the nitrogen? (hint: one the gases is water vapor)
(The vapor pressure of water of water at 40°C is 55.3 mmHg, at 50°C is 92.5 mmHg)
According to the question the partial pressure of nitrogen is 704.7 mmHg.
What is pressure?Pressure is a physical quantity that describes the amount of force applied to an object per unit area. It is measured in units of force per unit area, such as pascals (Pa) or pounds per square inch (psi). Pressure is an important factor in many scientific fields such as thermodynamics, fluid dynamics, and mechanics. Pressure is also a measure of how much energy is stored in a given material or system. Pressure is a scalar quantity, meaning that it has a magnitude but no direction. Pressure can be created by a number of sources, such as gravity, the exertion of force, and the application of heat.
The partial pressure of nitrogen is equal to the total pressure of the system minus the vapor pressure of water vapor. In this case, the total pressure is 760.0 mmHg, and the vapor pressure of water at 40°C is 55.3 mmHg. Thus, the partial pressure of nitrogen is:
Partial pressure of nitrogen = 760.0 mmHg - 55.3 mmHg = 704.7 mmHg
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A 30.6 g sample of the compound X2O3 contains 14.4g of oxygen atoms. What is the molar mass of element X?
To find the molar mass of element X, we need to use the given information to determine the number of moles of oxygen in the sample, and then use that to calculate the number of moles of element X in the sample. Then we can divide the mass of the sample by the number of moles of element X to get the molar mass.
First, we need to calculate the number of moles of oxygen in the sample. We can use the molar mass of oxygen (16.00 g/mol) to convert the mass of oxygen atoms to moles:
moles of oxygen = mass of oxygen / molar mass of oxygen
moles of oxygen = 14.4 g / 16.00 g/mol
moles of oxygen = 0.900 mol
Next, we need to use the formula of X2O3 to determine the number of moles of element X in the sample. The formula indicates that there are 2 moles of element X for every 3 moles of oxygen in the compound. Therefore:
moles of X = 2/3 × moles of oxygen
moles of X = 2/3 × 0.900 mol
moles of X = 0.600 mol
Now we can use the mass of the sample and the number of moles of element X to calculate the molar mass of X:
molar mass of X = mass of sample / moles of X
molar mass of X = 30.6 g / 0.600 mol
molar mass of X = 51.0 g/mol
Therefore, the molar mass of element X is 51.0 g/mol.
If your lab partner had allowed some of the water to siphon into the collection beaker before you started heating the sample, how would your results be impacted?
a)not affected
b)too low
c)too high
The molar volume would be impacted too high. Therefore, option C is correct.
What is molar volume?The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density (ρ) by the molar mass (M). It has the S.I. unit cubic meters per mole.
Thus, if a lab partner had allowed some of the water to siphon into the collection beaker before starting to heat the sample, the molar volume would be impacted too high. Therefore, option C is correct.
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What is 0.210 as a fraction
2. The chemical equation below represents the formation of hydrochloric acid.
H₂(g) + Cl₂(g) → 2 HCl(g)
If both gases are measured under STP conditions, what volume of H₂ gas will react
completely with 22.4 liters of Cl₂ gas?
One mole of H₂ reacts with one mole of Cl₂ to give 2 moles of hydrogen chloride gas. The volume of H₂ that will completely react with Cl₂ is 22.4 litres.
What is a mole?In the International System of Units, the mole is the unit of amount of a substance. It is specified that the mole contains exactly 6.022 * 10²³ elementary particles such as atoms, ions or molecules, similar to how a dozen denotes twelve.
At standard temperature and pressure (STP), one mole of any gas occupies a volume of 22.4 litres. From the given equation, the molar ratio of hydrogen and chlorine is 1:1. Since 22.4 litres of chlorine gas is used, then similarly, 22.4 litres of hydrogen gas must also be used up to give 2 moles of the product, hydrogen chloride gas.
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A metal object has a mass of 16.7 g. It was placed in a graduated cylinder containing
100.0 mL of water, the water level rose to 106.2 mL. What is the density and identity of
this metal?
To determine the density and identity of the metal, we need to first calculate the volume of the metal object, and then use its mass and volume to calculate the density.
The volume of the metal object can be calculated by measuring the change in the volume of the water in the graduated cylinder before and after the object was placed in it. The difference between the final volume (106.2 mL) and the initial volume (100.0 mL) is equal to the volume of the metal object.
Volume of metal object = final volume - initial volume
Volume of metal object = 106.2 mL - 100.0 mL
Volume of metal object = 6.2 mL
Next, we can calculate the density of the metal using the formula:
Density = mass / volume
Substituting the values we have:
Density = 16.7 g / 6.2 mL
Density = 2.69 g/mL
The density of the metal is 2.69 g/mL.
To identify the metal, we can compare its density to the densities of known metals. A quick search shows that the density of aluminum (Al) is around 2.7 g/mL, which is close to the calculated density of the metal in question. Therefore, it is possible that the metal object is made of aluminum. However, we cannot be certain without further testing.
If 23.4 mL
of the barium hydroxide solution was needed to neutralize a 4.66 mL
aliquot of the perchloric acid solution, what is the concentration of the acid?
The perchloric acid solutions has a concentration of 4.66 mol/L. How so much solute has been absorbed in the solvent is indicated by the solution's level of concentration.
What exactly is a science concentration?The percentage of a material, like salt, that is present in a specific volume of a liquid or tissue, like blood. Less water is present, and the material becomes more concentrated. Whenever a person doesn't consume sufficient amounts of water, for instance, the salt concentration in their urine may increase.
Ba(OH)2 moles equal volume times concentration, or 23.4 mL times 0.100 mol/L, or 0.00234 mol.
We can deduce from the equation that m2 m of HClO4 react including one mole pf Ba(OH)2. Hence, the amount of moles of Concentrated h2so4 in the 4.66 mL aliquot could be calculated as
0.00234 mol Ba(OH)2 divided by 1 equals moles of HClO4. (1 mol Ba(OH)2 / 2 mol HClO4) 0.0217 mol is equal to (1 L / 1000 mL) (4.66 mL / 1)
The concentration of a perchloric acid can finally be determined as follows:
HClO4 concentration is calculated as follows: moles per liter = 0.0217 mol / 4.66 mL = 4.66 mol/L
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A person has $4000to invest. Part of the money is to be placed in a certificate of deposit paying %, per year. The rest is to be placed in corporate bonds paying %, per year. If he wishes to obtain an overall return of % per year, how much should be placed in each investment?
Answer:
Let x = amount invested in certificate of deposit (in dollars)
Let y = amount invested in corporate bonds (in dollars)
Total amount invested = $100: x + y = 100
CD pays 2% per year, corporate bonds pay 4% per year, total return is 3% per year
Total return on investments = 3% of $100 = $3: 0.02x + 0.04y = 3
Simplifying the equations:
x + y = 100
2x + 4y = 300
Solving for x:
x + y = 100
x = 50
Therefore, the person should invest $50 in the certificate of deposit and $50 in corporate bonds to obtain an overall return of 3% per year.
Explanation:
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 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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Which statement describes mechanical energy?
the energy that is stored in chemical bonds
the energy that is associated with temperature
the sum of the kinetic energy and the potential energy of an object
the type of energy that is associated with electromagnetic radiation
ITS C NOT D, trust me
Mechanical energy is the sum of the kinetic energy and the potential energy of an object, option C.
Where is mechanical energy applied?Mechanical energy is applied in systems where there is movement or force involved, such as machines, vehicles, and structures. It is the sum of an object's kinetic energy and potential energy due to its position or state of deformation.
Some examples of mechanical energy in use include a car engine converting fuel into mechanical energy to power the vehicle, a wind turbine converting wind energy into mechanical energy to generate electricity, and a roller coaster converting potential energy at the top of a hill into kinetic energy as it descends.
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Place the following in order from smallest to largest by atomic radius: Rb, Na, K, Cs, P, He.
Group of answer choices
Cs
P
He
Answer:
He
P
Na
K
Rb
Cs
Explanation:
I am not sure if Na was one of the choices, but if it is this is the order. If not then just take out Na and then it is in the correct order.
A chemist adds 0.10 L of a 2.1M potassium iodide (KI) solution to reaction flask. Calculate the mass in grams of potassium iodide the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
The correct mass of potassium iodide added to the flask is 35g. To calculate the mass of potassium iodide added to the flask, we need to use the formula
mass = volume x concentration x molar mass
Putting the values -volume = 0.10 L (given)
concentration = 2.1 M (given)
molar mass of KI = 166.0028 g/mol (from periodic table)
Substituting these values in the formula, we get:
mass = 0.10 L x 2.1 mol/L x 166.0028 g/mol = 35.001484 g
Rounding off to the correct number of significant digits (two), the mass of potassium iodide added to the flask is:
mass = 35 g (rounded to two significant digits)
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A--B--> 3-ethyl-4- methylhexanal + C --D --> E + F
A =
B =
C =
D =
E =
F =
The structure of the compound is shown in the image attached
How do you deduce the structure of an organic compound?The molecular formula gives information about the types and number of atoms in the compound. This can be used to determine the possible functional groups and the degree of unsaturation (the number of rings or double bonds) in the compound.
When we look at the name of the compound, we can be able to tell the bonds and the substituents that we have in the compound and that would help us to deduce its structure.
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An equilibrium mixture contains 0.250 mol of each of the products (carbon dioxide and hydrogen gas) and 0.200 mol of each of the reactants (carbon monoxide and water vapor) in a 1.00 L container.
CO(g)+H2O(g)↽−−⇀CO2(g)+H2(g)
How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.300 mol once equilibrium has been reestablished?
Once equilibrium has been restored, we need to increase the amount of carbon monoxide to 0.300 mol by adding 0.343 mol of carbon dioxide at a fixed temperature and volume.
What makes up the equilibrium mixture?By measuring the rate of effusion through a pinhole, the composition of the equilibrium mixture (Cl2=2Cl), which is obtained at 1200 degrees Celsius, is ascertained. At 1.80 mm hg pressure, it is noted that the mixture emits 1.16 times more quickly than Krypton does at the same pressure.
The following is the expression for the reaction's equilibrium constant:
Kc = [CO2][H2] / [CO][H2O]
Do the equilibrium constant calculation:
Kc = [(0.250 mol/L)(0.250 mol/L)] / [(0.200 mol/L)(0.200 mol/L)]
= 1.5625 mol/L
The updated equilibrium concentrations of every species will be:
[CO2] = 0.250 + x mol/L
[H2] = 0.250 + x mol/L
[CO] = 0.300 mol/L
[H2O] = 0.200 + x mol/L
When we substitute these concentrations into the formula for the equilibrium constant, we obtain:
Kc = [(0.250 + x)(0.250 + x)] / [(0.300)(0.200 + x)]
Simplifying and solving for x, we get:
1.5625 = [(0.250 + x)(0.250 + x)] / [(0.300)(0.200 + x)]
4.6875(0.300 + x) = (0.250 + x)(0.250 + x)
1.40625 + 1.40625x = 0.0625 + 0.5x + x²
x² + 1.09375x - 1.34375 = 0
Using the quadratic formula, we get:
x = 0.343 mol
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A sample liquid is heated in a closed container until it changes to a gas. What happens to the size of the particles in the sample? What happens to the number of particles in the sample? What happens to the average speed of the particles?
According to the forces of attraction and kinetic theory of gases , the size and number of particles in the sample remains same while the average speed of the particles increases.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which of the following statements is NOT true about what happens in all chemical reactions? The ways in which atoms are joined together are changed. New atoms are formed as products. The starting substances are called reactants. The bonds of the reactants are broken and new bonds of the products are formed.
The statement that is not true about what happens in all chemical reactions is as follows: the ways in which atoms are joined together are changed (option A).
What is a chemical reaction?Chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A chemical reaction is different from physical change being that a chemical reaction involves the breaking of bonds in the substance called reactants to form new substances called products.
Characteristics of a chemical reaction are as follows:
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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.
2.74 Give the chemical formula for each of the following ionic com- pounds: (a) sodium phosphate, (b) zinc nitrate, (c) barium bromate, (d) iron(II) perchlorate, (e) cobalt(II) hydrogen car- bonate, (f) chromium(III) acetate, (g) potassium dichromate.
Phosphate of sodium: Nitrate of zinc, Na3PO4, Zn(No3)2, bromate of barium: Perchlorate of iron (II) and ba(BrO3)2: Cobalt (II) hydrogen carbonate, Fe(ClO4)2: Co(HCO3)2.
The acid that results from the ion acetate being formed is known as CH3COO?Hydrogen acetate, also known as acetic acid, is the simplest of these, consisting of its salts, esters, and the polyatomic anion CH3CO2, or CH3COO.
How is potassium dichromate K2Cr2O7 made?Potassium dichromate is the chemical name of an inorganic chemical reagent known as K2Cr2O7. Dipotassium bichromate and potassium bichromate are other names for it. It is a bright reddish-orange crystalline ionic solid. It has no odor and is insoluble in alcohol and acetone, but it dissolves in water.
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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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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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who are the molecules that would hydrogen have an oxydation state of zero
Answer:
It does not have an overall charge, and is a neutral molecule. For free elements, the oxidation number is zero. Hence, the oxidation number of hydrogen in ${H_2}$ is zero as well. Some examples of free elements having zero oxidation state are: $Na,\,Fe,\,{O_2},\,{S_8}$ et cetera.
Explanation:
Hydrogen peroxide breaks down, releasing oxygen, in the following reaction:
2H.02(ag) - 2H,0(1) + 02(g)
a. What mass of oxygen is produced when 1.840 mol of H,O, decomposes?
b. What mass of water is produced when 5.0 mol O, is produced by this reaction?
The mass of oxygen produced when 1.840 mol of H2O2 decomposes is 29.44g and the mass of water produced when 5.0 mol O, is produced by this reaction is 180.02g.
Given that the Hydrogen peroxide breaks down, releasing oxygen as:
[tex]2H2O2(g) -- > 2H2O(1) + O2(g)[/tex]
a.) The mass of oxygen is produced = m
Given the number of moles of H2O2 = 1.840
We know The molecular weight of H2O2 is = 34.01 g/mol
the molecular weight of O2 is = 32.00 g/mol.
We know that number of moles is equal to mass of substance divided by its molar mass such that:
number of moles of O2 = 1.840 mol H2O2 x (1 mol O2 / 2 mol H2O2)
The mass of O2 = 0.920 mol O2 * 32 g/mol O2 = 29.44g
b.) Given the number of moles of O = 5.0
Then number of moles of H2O produced = 5.0 mol O2 x (2 mol H2O / 1 mol O2) = 10 mol H2O
mass of H2O produced = 10 mol H2O * (18.02 g H2O / 1 mol H2O) = 180.02 g H2O
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how is the diaphragm needed for the muscular system
A heated sample was found to contain
85.25 g of anhydrous compound and
14.75 g H₂O. The molar mass of the
anhydrate is 208 g/mol. What is the value
of "n" in the hydrate formula?
A. 15
B. 1
C. 2
D. 10
Anhydrous Compound - nH₂O
.
This means that the ratio of anhydrous compound to water in the hydrate is 1:2. Therefore, the value of "n" in the hydrate formula is 2.
What is a hydrate and how to find ?To determine the value of "n" in the hydrate formula, we need to use the given information to calculate the number of moles of anhydrous compound and water in the sample, and then use the mole ratio between them to determine the value of "n".
First, we can calculate the number of moles of anhydrous compound:
moles of anhydrous compound = mass / molar mass
moles of anhydrous compound = 85.25 g / 208 g/mol
moles of anhydrous compound = 0.4091 mol
Next, we can calculate the number of moles of water:
moles of water = mass / molar mass
moles of water = 14.75 g / 18.015 g/mol
moles of water = 0.8180 mol
Anhydrous Compound - nH₂O
The mole ratio between the anhydrous compound and water is:
moles of anhydrous compound : moles of water
0.4091 mol : 0.8180 mol
We can simplify this ratio by dividing both sides by the smaller value:
0.4091 mol / 0.4091 mol : 0.8180 mol / 0.4091 mol
1 : 2
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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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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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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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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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