When 20.5 g of methane and 45.0 g of chlorine gas undergo a reaction that has a 75.0% yield, what mass (g) of chloromethane (CH₃Cl) forms? Hydrogen chloride also forms.

Answer:

1 not

2 not

3 not

4 balanced

5 not

6 not

7 balanced

Explanation:

the amount of elements must be equal in the reactant and products

Answer: Handwashing. It is estimated that washing hands with soap and water could reduce diarrheal disease-associated deaths by up to 50% 1. Researchers in London estimate that if everyone routinely washed their hands, a million deaths a year could be prevented 2.

Explanation:

BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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The molecular formula of the given compound is \($\mathrm{H}_{2} \mathrm{CO}_{3}$\) also known as  Carbonic acid.

The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula.

The precise number of various atom types present in a compound's molecule is indicated by the molecular formula.

Given that,

H = 3.3%

C = 19.3%

O = 77.4%

No. of moles of H = 3.3/1

No. of moles of H = 3.3

No. of moles of C = 19.3 / 12

No. of moles of C = 1.60

No. of moles of O = 77.4/16

No. of moles of O = 4.83

Therefore, the ratio of the atoms of C, H and O = 3.3 : 1.60 : 4.83

Divide by smallest value which you get =3.3 / 1.60 : 1.60 / 1.60 : 4.83 / 1.60

The ratio of the atoms of C, H and O = 2 : 1 : 3

So, the empirical formula is \($\mathrm{H}_{2} \mathrm{CO}_{2}$\)

Let the molecular formula is \($\left(\mathrm{H}_{2} \mathrm{CO}_{3}\right) \mathrm{n}$\)

Then, molar mass \($=(2 \times 1+1 \times 12+3 \times 16) n\\\)

Molar mass = 62n

As the question, 62 n = 60

n = 0.96 or n = 1 (rounded off to nearest ones)

So, the molecular formula is \($\left(\mathrm{H}_{2} \mathrm{CO}_{3}\right) 1=\mathrm{H}_{2} \mathrm{CO}_{3}$\) i.e., the compound is Carbonic acid.

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Answer:

no, because the merry go round is moving at a constant speed, which means it isnt changing in speed or direction.

Explanation:

Answer:

GUYS I JUST TOOK IT SO HERE IS THE EXACT ANSWER!

Explanation:

Yes, the merry-go-round is accelerating. Acceleration is a change in speed, direction, or both. Even though the speed of the merry-go-round does not change, its direction constantly changes as it spins.

It takes approximately 14.29 seconds for the concentration of NH₄OH to decrease from 0.570 M to 0.051 M.

The given reaction is second order in NH₄OH, with a rate constant of 45 M⁻¹¹. The rate equation for a second-order reaction is:

Rate = k * [NH₄OH]²

To calculate the time required for the concentration of NH₄OH to decrease from an initial concentration ([NH₄OH]₀) to a final concentration ([NH₄OH]t), we can use the integrated rate law for a second-order reaction:

t = 1 / (k * [NH₄OH]₀ - k * [NH₄OH]t)

Plugging in the values, we have:

t = 1 / (45 M⁻¹¹ * 0.570 M - 45 M⁻¹¹ * 0.051 M)

Simplifying the expression, we get:

t ≈ 14.29 seconds

Therefore, it takes approximately 14.29 seconds for the concentration of NH₄OH to decrease from 0.570 M to 0.051 M.

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Explanation:

Opposite hemispheres have opposite seasons, no matter the earth's rotation, because of the earth's tilt. The earth's tilt is responsible for all seasons.

Answer:

because

Explanation:

jdnfjfbdkvdifvfjf

Words or phrases is associated with acids or alkalis, the universal indicator will give blue color if the solution is a weak base.

A pH indicator is a solution of multiple chemicals that displays many smooth colour changes throughout a pH value range of 0 to 14 (it may be negative or higher depending on the concentration) to indicate the acidity or alkalinity of solutions, with 7 being neutral. Although various commercially available universal pH indicators are available, the most are variations on a formula patented by Yamada in 1933. Chemical Abstracts has information on this patent. Yamada's universal indicator experiments are also documented in the Journal of Chemical Education.

Water, propan-1-ol, phenolphthalein sodium salt, sodium hydroxide, methyl red, bromothymol blue monosodium salt, and thymol blue monosodium salt are common components of universal indicators.

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The compound is formed by 1 atom of gold and 3 atoms of chlorine.

In this case, the gold atom must have a charge of +3 in order to have a compound with a net charge of zero because the molecule Cl3 has a charge of -3. This is why the name of the compound is Gold(III) Chloride.

Answer:

Hydrochloric acid (HCl)

Explanation:

start by writing out the formula for your reaction:

NaOH+________-------> NaCl +H2O

Reactants   ---------------->    Products

Our reactants have to be composed of an acid and a base. Already we know that sodium hydroxide (NaOH) is a strong base, therefore we know that the missing reactant has to be an acid. We see our products have an extra Hydrogen and Chlorine, so knowing that our our missing reactant is an acid and knowing that we have a hydrogen and chlorine we know that one of the strong acids is hydrochloric acid which its formula is (HCl).

Two criteria that are most important for engineers to consider when developing a process to produce ammonia are:

A. The process needs to produce significant amounts of ammonia.

D. The process needs to be able to be performed safely.​

Ammonia is an odorless and colorless gas that is produced naturally by humans and in nature it is produced by soil, water, air, and bacteria.

Its various forms are important for many plants and soil.

Thus, the correct options are A and D.

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The two most important criteria for engineers to consider when developing a process to produce ammonia are:

A. The process needs to produce significant amounts of ammonia.

D. The process needs to be able to be performed safely.

The process to produce ammonia is known as the Haber-Bosch process. It involves the reaction of nitrogen gas and hydrogen gas over an iron catalyst under high pressure and temperature. The nitrogen gas is obtained from the air through a process called air separation, while the hydrogen gas is usually obtained from natural gas through a process called steam reforming.

The reaction occurs in two stages: first, nitrogen and hydrogen react to form ammonia and heat, and second, ammonia is cooled and condensed to form a liquid. The ammonia can then be purified and used for various applications, such as fertilizer production, refrigeration, and as a raw material in the production of various chemicals.

The Haber-Bosch process is an important industrial process because it allows for the production of ammonia on a large scale, which is essential for agriculture and the production of many chemical products. However, the process also requires a large amount of energy and produces greenhouse gases, so there is ongoing research to find more efficient and sustainable methods for producing ammonia.

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Answer:

Atoms

Explanation:

Answer: The answer is atoms! Have a great day!

The volume of the square shown in the diagram, given that it has a length of 4 in. is 64 in³

Volume of a square is given by the following formular:

Volume = Length × Width × Height

Recall:

For square shapes, length, width and height are equal i.e

Length = Width = Height

Thus, we can write that the volume of square as:

Volume of square = Length × Length × Length

Now, we shall obtain the volume of square. Details below:

Volume of square = Length × Length × Length

= 4 × 4 × 4

= 64 in³

Thus, the volume of the square is 64 in³

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Answer:

Use a catalyst, use more reactants, have a larger reactant surface area, more pressure, higher temperature.

Explanation:

1. The limiting reagent is sulfur trioxide, SO₃ and the excess reagent is water, H₂O

2. The mass of the excess reagent leftover is 14.92 g

3. The mass of sulfuric acid, H₂SO₄ is produced is 8.06 g

The limiting and excess reagent can be obtained as follow:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted with 18 g of H₂O

Therefore,

6.58 g of SO₃ will react with = (6.58 × 18) / 80 = 1.48 g of H₂O

From the above calculation, we can see that only 1.48 g of H₂O out of 16.4 g is needed to react completely with 6.58 g SO₃.

Thus, the limiting reagent is SO₃ and the excess reagent is H₂O

The mass of the excess reagent leftover can be obtained as follow:

Mass of excess reagent, H₂O leftover = Mass given - mass reacted

Mass of excess reagent, H₂O leftover = 16.4 - 1.48

Mass of excess reagent, H₂O leftover = 14.92 g

The mass of H₂SO₄ produced can be obtained as illustrated below:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

6.58 g of SO₃ will react to produce = (6.58 × 98) / 80 = 8.06 g of H₂SO₄

Thus, the mass of H₂SO₄ produced is 8.06 g

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Answer:

Explanation:

Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements.

Answer:

Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements

Explanation:

The balanced reaction equation is;

\(2LiI + Pb(NO_{3} )_{2} --- > 2LiNO_{3} + PbI_{2}\) as we can see from the equation that is written here.

In the balancing of the reaction equation, we have to make sure that the number of the reacting atoms on the reactant and the product side are the same for each of the elements.

On both sides of the equation, tally the atoms of each element. First, balance the polyatomic ion or the most complicated molecule. One element at a time, balance the other atoms of the reactants and products. Make sure that every atom is now evenly distributed on both sides of the equation.

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The silver coating on the spoon is produced. When electrolyzing a spoon made from iron with silver, the anode, cathode, and electrolyte that can be used are as follows:

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A redox reaction's hydroxide ion component involving oxidation or reduction is referred to as a half reaction. By taking into account, we get a half reaction.

The diatomic anion OH, which is made up of oxygen and hydrogen atoms, is most frequently referred to in chemistry as hydroxide. It is among the known simplest diatomic ions. The group of substances that contain the hydroxide ion is referred to as "hydroxide" as well.

Galvanic cell with Zn and Cu as an example. CuSO4(aq) Zn(s) + CuSO4(aq) (s) Oxidation occurs at the Zn anode (the metal loses electrons). This can be seen in the oxidation half-reaction shown below (see how the electrons are on the products side): Zn(s) equals Zn2+ + 2e.

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The law of conservation of matter states that the number of atoms of one element in the product must be to the number of atoms of one element in the reactant.

1. A reaction where two molecules take the place of two other molecules is double replacement reaction

3. Atoms of oxygen in H₂O are 1 mole of atoms

4. Atoms of oxygen in H₂SO4 are 4 moles of atoms

7. The compounds used in a chemical reaction are the reactants

8. The compounds formed during a chemical reaction are the products

9. Coefficient before H₂ in N₂ + H₂ → NH3 is 3

10. The number of atoms of one element in the product must be to the number of atoms of one element in the reactant is the law of conservation of matter

Up

11. A reaction where separate compounds form one new compound is a synthesis reaction

2. A reaction that needs energy to begin is an endothermic reaction

5. A reaction where a compound breaks down into separate molecules is a decomposition reaction

6. A reaction where one molecule takes the place of another compound is a displacement reaction.

9. Number of nitrogen molecules in the product (NH)3PO4 + Pb(NO3)4 → Pb3(PO4)2 + NH NO

11. Number of Li in the product: BF3 + Li₂SO3 → B₂(SO3)3 + 2 LIF are two moles of atoms

12. Number of oxygens in the reactant 4 C3H3 + 15 O₂ →  6 H₂O + 12 CO₂ are 2 moles of atoms

13. Atoms of oxygen in Ba3(PO4)2 are eight atoms

14. Atoms of nitrogen in (NH4)₂CO₂​ are  two atoms

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Answer:

Explanation:

2H2O = H2 + O2

this ain't balanced because the value of hydrogen are not the same.

\(61.25 \times 10^{24}\) grams of sulfuric acid is required if the battery delivers a total charge of 2.0 × 10⁵ C.

Each molecule of H₂SO₄ breaks into 2H and SO₄ and two electrons.

These two electrons are responsible for the charge delivered to the battery.

If total charge delivered to the battery is 2.0 × 10⁵ C.

The charge on each electron is \(1.6 \times 10^{-19}\) C.

Total number of electrons that can produce 2.0 × 10⁵ C is,

\(\dfrac{2.0 \times 10^{5} }{1.6 \times 10^{-19}}\)

=  electrons.

98 grams of H₂SO₄ delivers 2e⁻ to the battery.

1e⁻ needs 49 grams of H₂SO₄.

\(1.25 \times 10^{24}\) electrons will require, \(61.25 \times 10^{24}\) grams of sulfuric acid.

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Answer:

In diamond the carbon atoms are covalently bonded as flat sheets

In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets

The structure of copper includes a lattice of positive ions

Explanation:

Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.

Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.

Answer:

1. Warm air rises and cold air sinks.

2. Air moves from high to low pressure.

3. Cold air is denser than warm air.

4. Warm air is lighter than cold air and consequently exerts less pressure.

5. Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

Answer:

D

Explanation:

The answer is Filtration

When separating a mixture using the property of size, filtration is used in the separation methods would you use. The correct option is D.

Filtration is a process of separating different substances from each other.  It is done to separate the different substances from each other.  These substances can be solid, gas and liquid.

There are different processes of separation to separate different substances. These processes are magnetism, distillation, evaporation, and filtration.

Magnetism is the process used to separate magnetic substances from nonmagnetic substances. Evaporation is a process of separating the substance from a high boiling point to a low boiling point. Filtration is used to separate using the property of size.

Thus, the correct option is D. filtration.

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To make a 250 ml solution of 70% ethanol, you will need 175 ml of ethanol and 75 ml of water. The solution will have a final volume of 250 ml with a 70% ethanol concentration.

To make 250 ml of a 70% ethanol solution (in water) from a stock of 100% ethanol, you will need to take the following steps:

Step 1:

Calculate the amount of ethanol required for the solution. The volume of ethanol required to make 250 ml of a 70% ethanol solution can be calculated as follows:

Volume of ethanol = (70/100) x 250 ml= 175 ml

So, you will need 175 ml of 100% ethanol to make a 250 ml solution with a 70% ethanol concentration.

Step 2:

Calculate the volume of water required. To calculate the volume of water needed, subtract the volume of ethanol from the total volume of the solution.

Volume of water = Total volume of solution – Volume of ethanol

= 250 ml – 175 ml= 75 ml

Therefore, you will need 75 ml of water.

Step 3:

Mix the ethanol and water together in the right proportion. Once you have calculated the amount of ethanol and water required, add the 175 ml of ethanol to the 75 ml of water to obtain the 250 ml solution of 70% ethanol in water.

Consequently, the solution will have a final volume of 250 ml with a 70% ethanol concentration.

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The 2.00 grams of NaOH is added to 100.0 mL of water at 22 °C. after dissolving, the temperature increases to 27.3 °C. The molar enthalpy of dissolution for NaOH is - 45.5 kJ/mol.

Given that :

Mass of NaOH = 2 g

Volume = 100 mL

ΔT = 5.3 °C

Mass of water = 1 × 100

                        =  100 g

Mass of the solution = mass of water + mass of NaOH

                                   = 100 + 2

                                   = 102 g

Q solution = 102 × 4.184 × 5.3

Q = 2261.8 J

Q process + Q solution = 0

Q process = - 2261.8 J

Moles of NaOH = mass / molar mass

                          = 2 / 40

                          = 0.05 mol

The molar enthalpy , ΔH = Q / n

ΔH  = - 2261.8 / 0.05

       = - 45236 J / mol

       = - 45.4 kJ/mol

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