John is completing a lab in which he is using the corrosive base sodium hydroxide (NaOH). For this laboratory experiment, what types of safety precautions should he take
Please put on a lab apron. It helps shield clothing from damage and stains. Examining glass for fractures and chips. This damaged or chipped glassware needs to be properly disposed of.
In order to deal with it safely, we must take the appropriate precautions. Skin burns or other skin injury can be brought on by sodium hydroxide. Additionally, it can injure eyes. Learn as much as you can about the chemicals that will be utilized, including any exposure or leak risks. Find the spill kits and learn how to use them. Verify labels and throw away any chemicals that aren't 100 percent pure. For ease of access, alphabetize the lab chemicals. Security is the practice of keeping unwelcome dangers and hazards out of the lab environment.
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PLS HELP ASAP PLSSSS
A compound with a molecular mass of 56.104 grams is found to be 86% carbon. The rest of the compound is hydrogen. Find its molecular formula. Group of answer choices C3H6 C4H8 C2H4 C6H10
The molecular formula for this compound is C4H8 that can be calculated from its empirical formula.
The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. The compound is made up of only carbon and hydrogen atoms thus it is known as hydrocarbon. The percentage of carbon is 86%, therefore the percentage of hydrogen is 14%.
The molecular mass of the compound is given i.e., 56.104 grams.
Moles of C= 86 g * 1 mol/12 g =7 moles
Moles of H=14 g* 1 mol/1 g= 14 moles
Thus, the mole ratio of C:H can be given as:
Moles of C/ Moles of H= 7/14=1/2
Thus, the empirical formula is CH2 while its molecular formula is C4H8.
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A student has a 5. 00 gram sample of calcium chloride (CaCl2) solid. How many miles of calcium chloride are contained in this sample
0.0450 moles of calcium chloride are contained in this sample
A mole of every substance weighs the same as its molecular mass and contains the same number of particles, according to Avogadro's law.
Utilizing the equation, we can determine the moles.
Number of moles= Given Mass/ Molar Mass
Number of Moles = [tex]5.00 mg / 110.98 g/mol = 0.0450 moles[/tex]
Thus there are 0.0450 moles of [tex]Cacl2[/tex]
The mole is the volume of a substance that contains exactly as many molecules, atoms, radicals, ions, or electrons as there are in 12 grams of 12C.
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Carefully feel the sides of the flask. Is the crystallization of sodium acetate endothermic or exothermic? How do you know?
Answer:
It is not possible to determine whether the crystallization of sodium acetate is endothermic or exothermic simply by feeling the sides of the flask. To determine the heat of crystallization, you would need to measure the temperature of the solution before and after crystallization and compare the two values.
The heat of crystallization is defined as the heat absorbed or released during the process of crystal formation from a solution or a melt. If heat is absorbed during the process, the reaction is endothermic and the temperature of the solution or melt will decrease. If heat is released, the reaction is exothermic and the temperature will increase.
In the case of sodium acetate, it is an exothermic reaction, meaning that heat is released during crystallization and the temperature of the solution will increase. This is because the process of forming the crystal lattice requires the breaking of hydrogen bonds and other intermolecular forces, which releases energy.
Explanation:
Answer:
exothermic
Explanation:
When you crystallize the solution, sodium acetate forms a new bond from the soluble aqueous state ( Na+ and C2H3O2- ) to the solid state (NaC2H3O2). Forming bonds in chemistry is generally an exothermic reaction.
What percentage of alpha-linolenic acid (ALA) converts to a biologically available form called eicosapentaenoic acid (EPA)
Alpha-linolenic acid (ALA) is an essential omega-3 fatty acid that is found in certain plant oils, such as flaxseed and canola oil, and in some nuts and seeds. It is considered an essential fatty acid because the body cannot produce it and it must be obtained through the diet.
Eicosapentaenoic acid (EPA) is a biologically available form of omega-3 fatty acid that can be produced from ALA through a series of metabolic processes. The percentage of ALA that converts to EPA in the body varies depending on a number of factors, such as individual genetics, dietary factors, and overall health.
On average, the conversion rate of ALA to EPA is relatively low, with estimates ranging from 0.1-9% in healthy adults. The exact percentage of conversion is not well-established, but it is believed to be low due to the limited activity of the enzymes involved in the conversion process.
It's also important to note that not all of the EPA produced from ALA will be used by the body, as some of it will be converted to other fatty acids such as docosahexaenoic acid (DHA). The conversion rate of ALA to DHA is even lower, typically less than 0.5%.
It's important to note that some studies show that supplementation with EPA and DHA may be more beneficial for some health outcomes than supplementing with ALA, as these forms of omega-3 are more easily incorporated into cell membranes and have a more direct effect on the body.
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Question 6
Since the Moon has no living organisms, which method would be best for determining the age of a Moon rock?
А
radioactive dating
B
law of superposition
С
density of sediment collection
D
fossil and mineral comparison
Me
Radioactive dating measures the rate of decay of radioactive materials in rocks.
What is radioactive dating?Radiometric dating, radioactive dating, or radioisotope dating is a technique used to date things such as rocks or carbon that included trace radioactive contaminants when they were produced. Radioactive dating is a technique for dating rocks and minerals that makes use of radioactive isotopes. This approach is appropriate for igneous and metamorphic rocks that cannot be dated using the sedimentary stratigraphic correlation method. There are around 300 naturally occuring isotopes known. The underlying idea behind radiometric dating is that you can compute the age of a sample by comparing the presence of a radioactive isotope within it to its known abundance on Earth and its known half-life (rate of decay).
Here,
Radioactive dating determines the rate at which radioactive elements in rocks decay.
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What do Nitrogen, Oxygen, and Fluorine have in common, with regards to their electronegativity and position in the periodic table
The elements that are nitrogen, oxygen and fluorine all of them exist as diatomic gases at room temperature.
There are total seven diatomic elements that are written as follows: hydrogen (H), nitrogen (N), oxygen (O), fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). The formation of diatomic gases is done by making up two atoms of the same gas. For example, the formula for nitrogen gas is N2, the formula for oxygen gas is O2 and the formula for Fluorine gas is F2. The word diatomic has other synonym which is known as heteronuclear. The position of all these three elements in the periodic table is different so their electronegativities, the only common factor is that they exist as a gas.
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State what is meant by the term polarised (2 marks)
Explanation:
use to describe something that is complete opposite
How many moles of KCI are produced at the same time at 9 moles O2? 2KCIO3=2KCI+3O2
Answer:
Explanation:
To determine how many moles of KCI are produced at the same time as 9 moles of O2, you can use the balanced chemical equation for the reaction. The balanced equation for the reaction of potassium chlorate (KCIO3) with oxygen gas (O2) is:
2KCIO3 = 2KCI + 3O2
This equation tells us that for every 2 moles of potassium chlorate that react, 2 moles of potassium chloride (KCI) are produced, along with 3 moles of oxygen gas.
Since we know that 9 moles of O2 are produced, we can use the balanced equation to determine how many moles of KCI are produced as well. Since the ratio of O2 to KCI in the equation is 3:2, we can divide 9 moles of O2 by 3 and multiply the result by 2 to find the number of moles of KCI that are produced:
9 moles O2 / 3 = 3 moles KCI
So, for 9 moles of O2, 6 moles of KCI are produced.
Answer: 6 mol KCI
Explanation:
How much horizontal force must be applied to a 1 kg puck to make it accelerate on a friction-free air table of 9.8 m/s2?
The force of 9.8 N must be applied to a 1 kg puck to make it accelerate on a friction-free air table of 9.8 m/s².
What is force?Force is the influence that can change the state of the body of motion or rest. The S.I. unit of measurement of force can be written as Newton and force is a vector.
Force can change the direction as well as the speed. The force can be calculated from the mass (m) & acceleration.
F = ma
Given, the mass of the puck, m = 1 Kg
The acceleration of the puck, a = 9.8 m/s²
The force acting on the puck can be calculated as:
F = ma = 1 × 9.8
F = 9.8 N
Therefore, the force needed to apply on a puck is equal to 9.8 N.
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What can help overcome a positive enthalpy of solution and allow a solid solute to dissolve in water
New ion-dipole or dipole-dipole attractions take effect if the solute is an ion or polar molecule on its own.
When things go well, they could release enough potential energy to partially offset the energy needed to integrate the solute into the structure. Ammonia dissolving in water is a striking illustration of this. Solution's enthalpy. A solution is a uniform combination of two or more components that can exist in the solid, liquid, or gas phases. The amount of heat that is emitted or absorbed during the dissolving process is known as the enthalpy change of solution (at constant pressure).The solvent molecules begin to dissociate as a result. This process' enthalpy is referred to as. Since energy is needed to break the contact between the B molecules, this reaction, like the first, is always endothermic (). Let's try to picture what has transpired up to this point.
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The measured electric mobilities of K+ (aq) and Cl– (aq) at a KCl concentration of 0.30 mol L–1 are respectively, 5.9 10 –4 and 6.14 10–4 cm2 V–1 s–1 at 30 OC. Calculate the transport numbers and molar ionic conductivity of K+ and Cl–. What is the molar conductivity of KCl at this concentration? Assume complete ionisation of KCl.
The molar conductivity of KCl at this concentration and transport numbers and molar ionic conductivity of K+ and Cl– are
Λm =1.806×10−4 t(K+)=4.90033223×10^−9 t(Cl-) =5.09966777×10^−9What is the molar conductivity of KCl at this concentration?Generally, The transport number, t, of an ion can be calculated using the equation: t = (μi x Ci) / Λm,
where
tμi is the electric mobility of the ion, Ci is the concentration of the ion, and Λm ishe molar conductivity of the electrolyte solution.Given that the electric mobility of
K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1, the electric mobility of Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1, and the concentration of KCl is 0.30 mol L^-1, we can calculate the transport numbers as:
t(K+) = (5.9 x 10^-4 cm^2 V^-1 s^-1 x [K+]) / Λm t(Cl-)
= (6.14 x 10^-4 cm^2 V^-1 s^-1 x [Cl-]) / Λm
where
[K+] and [Cl-] are the molar concentrations of K+ and Cl- ions, respectively.
The molar ionic conductivity, Λi, of an ion can be calculated using the equation: Λi = μi x Ci,
where
μi is the electric mobility of the ion and Ci is the concentration of the ion.Given that the electric mobility of K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1 and the concentration of K+ is 0.15 mol L^-1, the molar ionic conductivity of K+ is:
Λ(K+) = 5.9 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1
Λ(K+) =8.85×10−5
Similarly, given that the electric mobility of
Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1 and the concentration of Cl- is 0.15 mol L^-1, the molar ionic conductivity of Cl- is:
Λ(Cl-) = 6.14 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1
Λ(Cl-) =9.21×10^−5
Finally, the molar conductivity of KCl can be calculated as:
Λm = Λ(K+) + Λ(Cl-)
=9.21×10^−5+8.85×10^−5
Λm =1.806×10−4
The transport numbers of K+ and Cl- can be calculated by
t(K+) = Λ(K+) / Λm and
t(Cl-) = Λ(Cl-) / Λm respectively.
t(K+) = 8.85×10−5/1.806×10−4 '
t(K+)=4.90033223×10^−9
and
t(Cl-) =9.21×10^−5/1.806×10−4
t(Cl-) =5.09966777×10^−9
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Ethylene burns in oxygen to form carbon dioxide and water vapor:
C2H4(g) + 3 02(g) --> 2 CO2(g) + 2 H2O(g)
How many liters of water can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are
consumed in this reaction?
67.0L of H₂O can be formed if 1. 25 liters of ethylene at 1. 00 atm and 298K are consumed in this reaction.
What do you mean by mole?A mole is know to be the unit used in chemistry to measure the amount of a substance. It is defined as the amount of matter that contains as many atoms, molecules, or other particles as there are in 12 grams of carbon-12. Moles are a convenient way to measure large numbers of very small particles such as atoms, molecules, ions and electrons.
The molar volume of gas at 1.00 atm and 298 K is 22.41 L/mol.
Given that
2 moles of water are produced from 1 mole of ethylene,
The number of liters of water produced can be calculated with the following formula:
1.25 L C₂H₄ x (2 mol H₂O / 1 mol C₂H₄) x (22.41 L H₂O / 1 mol H₂O)
= 67.0 l H₂O
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How does Angelica Hernandez work help others
Answer:Angelica currently works on energy efficiency programs for Nexant, Inc, an Arizona-based company focused on clean energy solutions.
Explanation:
I need help plssss:(
the question is in the photo
Malachite is a green colored mineral that is 57.5% copper. What mass of copper is present in a 250.0 g sample of malachite
57.5% Cu2(CO3)(OH) (OH) Other elements are also present in addition to copper.
To get the mass percent of copper in malachite (Cu2(OH)2CO3), apply the following formula:
Malachite (Cu2(OH)2CO3) has a molar mass of 2x63.5% + 2(16+1) + 12 + (16x3) = 127 + 2(17) + 12 + 48 = 127 + 34 + 12 + 48 = 221g/mol.
Cu2(OH)2CO3 has a Cu mass of 2 x 63.5g, or 127g.
The mass-based fraction of Cu in Cu2(OH)2CO3 is calculated as Cu2(OH)2CO3 mass per mol mass multiplied by 100 = 127/221 x 100 = 57.5%.
Malachite Cu2(OH)2CO3 has 57.5% of its mass in copper.
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Identify the following chemical reaction: 8 Cu + S8 → 8 CuS
Combination reaction: 8 Cu + S8 8 CuS in terms of chemistry. There are multiple reactants and multiple products.
Combination reaction: what is it?Combination reactions occur when two or more substances combine to form a single new substance. Composite processes are also referred to as synthetic reactions. The typical structure of an active components is A+BAB. A combination reaction occurs when two components combine to form a compound.
What qualities make into a combination reaction?A combination synthesis can involve any number of different reactants. A non-metal and a metal combinations reaction every time leads to an electrolytic process. Combination conformational changes fall into one of three categories. In particular, they consist of two elements combined, two compounds combined, and one element combined with one compound.
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Enrichment Activity 2.
Next up, let us compare the frequencies of different EM waves. Copy and answrr the table on page 16, refer to figure 2, then answer the question that follows.
PA HELP POOOOO
EM rays, or electromagnetic radiation, is a form of energy that is emitted and absorbed by charged particles.
What are Gamma rays?
Gamma rays are a type of electromagnetic radiation, similar to visible light and x-rays, but with much higher energy. They are produced by the hottest and most energetic objects in the universe, such as neutron stars, pulsars, and black holes. Gamma rays can also be produced artificially, in particle accelerators or nuclear reactions. Gamma rays have the shortest wavelength and highest energy of any type of electromagnetic radiation.
| Wave | Frequency (Hz) |
| Radio Waves | < 3 x 10^9 |
| Microwaves | 3 x 10^9 |
| Infrared Radiation | 3 x 10^12 |
| Visible Light | 4 x 10^14 |
| Ultraviolet | 7.5 x 10^14|
| X-Rays | 3 x 10^16 |
| Gamma Rays | 3 x 10^19 |
Which type of EM wave has the highest frequency?
Gamma Rays have the highest frequency with 3 x 10^19 Hz.
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Calculate the pH of each of the following solutions of a strong acid in water.
(a) 0.16 M HCl
(b) 4.4 M HClO4
(c) 2.3???10?11 M HI
The pH of each of the following solutions of a strong acid in water for (a) 0.16 M HCl is 0.78, (b) 4.4 M HClO4 is 3.35, (c) 2.31011 M HI is 10.64.
A strong acid is an acid that is completely ionized in water. Therefore, the pH of a solution of a strong acid in water can be calculated using the following formula:
pH = -log[H+]
(a) 0.16 M HCl:
= [H+]
= 0.16 M
pH
= -log(0.16)
= -(-0.78)
= 0.78
(b) 4.4 M HClO4:
[H+]
= 4.4 M
pH
= -log(4.4)
= -(0.35)
= 3.35
(c) 2.3 x 10^-11 M HI:
[H+]
= 2.3 x 10^-11 M
pH
= -log(2.3 x 10^-11)
= -(-10.64)
= 10.64
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2 H2 + O2 --> 2 H2O
What mass of water (H2O) will be collected if 20. 0 grams of hydrogen gas (H2) are consumed?
Select one:
179 grams
89. 4 grams
44. 7 grams
358 grams
Answer:
2H2 +O2 - 2H20
4g of H react to give 36g of H20
20g of H gives Xg of H20
cross multiply
4x= 36*20
4x= 720
Xg = 720/4
Xg= 180g approximately
That is A which is 179
A scientist performs an experiment on an unknown element. She finds that the unknown element forms an ionic bond with beryllium (Be). She concludes that the unknown element must belong in group 2 of the periodic table. State whether or not you think this result supports her conclusion, and why. (2 points)
The test result, which shows a bond with beryllium but not lithium, does not support her conclusion.
What is beryllium?
Beryllium basically is a chemical element with the symbol Be and atomic number 4. It is a light, strong, and alkaline metal that is used in alloys, medical equipment, and aerospace components due to its light weight and high strength. It is also used in nuclear reactors as a neutron reflector and absorber.
Beryllium is a group 2 element that forms ionic bonds with nonmetals.
Non-metals are elements ranging from Group 15 to Group 17.
As a result, the unknown element must be from Group 15 to Group 17.
Hence, her conclusion that the unknown element belong to group 2 is wrong.
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The world’s record for the largest cup of coffee was broken on October 152010, with a 2010 gallon cup of coffee in Las VegasNevada. If a cup of coffee contains 237 mL of coffeehow many cups of coffee would be required to fill this enormous coffee cup?
The number of coffee cups that would be required to fill the enormous coffee cup would be 32 cups.
Dimensional analysisThe world's largest cup of coffee can hold 2010 gallons of coffee as recorded in Las Vegas.
A normal coffee cup will only hold as much as 237 mL of coffee. Recall that:
1 gallon = 3.78541 LIf 1 gallon = 3.78541 L
2010 gallons = 2010 x 3.78541
= 7608.6741 L
In other words, the coffee cup with the record size will hold a maximum of 7608.6741 L of coffee while a normal coffee cup will only hold 237 mL. The problem now is the number of number coffee cups that will fill the world's record largest coffee.
7608.6741/237 = 32.10
Therefore, the number of normal coffee cups that would be required to fill the enormous coffee cup would be approximately 32 cups.
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What are two characteristics of the rock found 3 mya?
To solve this we must be knowing each and every concept related to rock and its characteristics. Therefore, the two characteristics of the rock can be given as below.
What is rock?The word rock relates to the material's bulk volume, which includes the grain or crystals in addition to the enclosed vacuum space.
The two characteristics of the rock are:
Some minerals exhibit color features related to mineral composition and atom arrangement: for example, magnetite is black, chlorite is green, and pyrite is brassy yellow.
The capacity of a mineral to resist scratching is used to estimate its hardness, which is generally determined on fresh material. When a mineral is scraped with a knife, it softens. If a knife cannot scratch it, the two have equivalent hardness or even the mineral is harder.
Therefore, the two characteristics of the rock can be given as above.
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How many moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene
2 moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene (C11H16).
What is moles?Moles, in chemistry, is a unit of measurement used to express the amount of a substance. It is equal to 6.022 x 1023 atoms, molecules, ions, or other particles. In other words, a mole contains an exact number of particles, which is known as Avogadro's number. The mole is a convenient way to measure and compare large amounts of a substance. It is also used to measure the amount of energy released or absorbed in a chemical reaction.
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Help Please!! How do I do this?
A sample of nitrogen is heated from STP to 100°C at constant pressure. Calculate the volume at 100°C.
Considering the Charles' law and STP conditions, the volume at 100°C is 30.60 L.
Charles' lawCharles' law establishes the relationship between the volume and the temperature of a sample of gas at constant pressure and establishes that when the temperature is increased the volume of the gas also increases and that when cooling the volume decreases.
Mathematically, Charles's law is expressed as:
V÷T=k
where:
V is the volume.
T is the temperature.
k is a constant.
Analyzing an initial state 1 and a final state 2, it is fulfilled:
V₁÷T₁= V₂÷T₂
STP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume at 100°CIn this case, you know:
V₁= 22. 4 LT₁= 0°C= 273 KV₂= ?T₂= 100 °C= 373 KReplacing in Charles' law:
22.4 L÷ 273 K= V₂÷ 373 K
Solving:
(22.4 L÷ 273 K)× 373 K= V₂
30.60 L= V₂
Finally, the final volume is 30.60 L.
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A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa, what is PHe ?
A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa, PHe is 72.3 kPa.
What is total pressure ?Static pressure and velocity pressure are added to create total pressure. There is static pressure in a fluid that is not flowing. The pressure required to accelerate air from a zero velocity to a specific velocity that is proportional to the kinetic energy of the air stream is known as velocity pressure.
Consider the friction that exists between a fluid and the interior surface of a pipe. The fluid's density and velocity are used to compute the dynamic pressure: the total pressure in a mixture of ideal gases is the total of the partial pressures of the individual gases.
Total pressure = PO2 + PN2 + PHe
189.9 kPa = 104.6 kPa + 13.0 kPa + PHe
PHe = 72.3 kPa
Thus, A gas mixture containing oxygen, nitrogen, and He has a total pressure of 189.9 kPa. If PO2 = 104.6 kPa and PN2 = 13.0 kPa,PHe is 72.3 kPa.
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Which of the following are commonly used oxidizing agents? Select all that apply. O Hydrochloric add O Sodium dichromate O Chromic acid O Sodium borohydride
Sodium dichromate and chromic acid are commonly used as oxidizing agents.
Oxidizing agents are the compounds that can either accept hydrogen or electrons from the other molecules. It is a element or compound which participates in a oxidation-reduction reaction and accept electrons from the different species. By the acceptance of electrons from other substances, oxidizing agents cause their oxidation states to become more positive. Oxidizing agents are reduced as well. They can also transfer oxygen atoms to the molecules in some of the cases. Sodium dichromate and chromic acid are used to oxidize the other inorganic salts as well as alcohols.
Hydrochloric acid is a strong acid as well as sodium borohydride is a strong reducing agent.
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Determine the number of atoms of each element in the following:4P4O10
Answer:
16 P
40 O
Explanation:
You have 4 moles of P4O10
Therefore you multiply the subscript of each atom of the compound by 4.
There are 4 phosphorus atoms in 1 mole of P4O10 so in 4 moles you would have 4*4 atoms so 16
There are 10 oxygen atoms in 1 mole of P4O10 so in 4 moles you would have 4*10 so 40
How does the arrangement of atoms affect the classification of matter?
On the basis of arrangement of atoms, the matter is classified into three states: solid, liquid and gas.
In Chemistry, there are three fundamental states of matter based on the arrangement of molecules and atoms inside it.
Generally, solids have strict and rigid arrangement of atoms as they posses strong intermolecular forces and have high melting and boiling points. solids have fixed composition of atoms.
Similarly, liquids have loose arrangement of atoms and molecules keep moving randomly in a liquid. Liquids have low melting and boiling points as compared to solids. Gases have weakest intermolecular forces and atoms are arranged randomly in them. Also, their molecules keep moving in all directions.
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