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ohaa [14]
3 years ago
8

At equilibrium the reactant and product concentrations are constant because a change in one direction is balanced by a change in

the other as the forward and reverse rates become equal:At equilibrium: rate_twd=rate_rev When a chemical system is at equilibrium,a. he concentrations of the reactants and products have reached constant values.b. the concentrations of the reactants are equal to the concentrations of the products.c. the forward and reverse reactions have stopped.d. the reaction quotient, Q, has reached a maximum.e. None of the choices.
Chemistry
1 answer:
Anna [14]3 years ago
5 0

Answer: a. The concentrations of the reactants and products have reached constant values

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.  For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equal to rate of the backward reaction.

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time and are constant.

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_{eq}

K is the constant of a certain reaction when it is in equilibrium, while Q is the quotient of activities of products and reactants at any stage other than equilibrium of a reaction.

For a equilibrium reaction,

A\rightleftharpoons B

K_{eq}=\frac{[B]}{[A]}

Thus the correct answer is the concentrations of the reactants and products have reached constant values.

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A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the fin
castortr0y [4]

Answer:

The molarity of the final solutions if these two solutions are mixed is 27.14 \frac{moles}{L}

Explanation:

Yo know:

  • Solution-1: 25M, 400mL
  • Solution-2: 30M, 300 mL

Molarity being the number of moles of solute per liter of solution, expressed by:

Molarity (M)= \frac{number of moles}{volume}

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

  • Solution-1: being 0.400 L=400 mL ⇒ 25 M* 0.400 L= 10 moles
  • Solution-2: being 0.300 L=300 mL ⇒ 30 M* 0.300 L=  9 moles

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

Molarity (M)= \frac{moles of solution 1 + moles of solution 2}{Volume solution 1 + Volume solution 2}

In this case, you have:

  • moles of solution-1: 10 moles
  • moles of solution-2: 9 moles
  • volume solution-1: 0.400 L
  • volume solution-2: 0.300 L

Replacing:

Molarity (M)=\frac{10 moles + 9 moles}{0.400 L + 0.300 L}

Solving:

Molarity (M)=\frac{19 moles}{0.700 L}

Molarity= 27.14 \frac{moles}{L}

<u><em>The molarity of the final solutions if these two solutions are mixed is 27.14 </em></u>\frac{moles}{L}<u><em></em></u>

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3 years ago
How many sucrose molecules are in 3.0 moles of sucrose
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Which of the following would lose heat the fastest?
Molodets [167]

Answer:

15 grams of water

Explanation:

15 grams of water of water would lose heat the faster compared to higher masses of water.

Water generally is a poor conductor heat.

  • To heat up a unit of water, significant amount of energy must be added to the body of water.
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3 years ago
Which elements have the most properties in common with magnesium
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5 0
3 years ago
Identify the catalyst in this reaction, explain how
telo118 [61]

Question:

Sulfuric acid was once produced through the reaction of sulfur trioxide with water. Sulfur trioxide can form through the reaction of sulfur dioxide and oxygen gas. When nitrogen monoxide gas is added to the system, the reaction speeds up significantly because it proceeds through the following steps:

equations

Identify the catalyst in this reaction, explain how you know it is the catalyst, and describe how it increases the rate of the reaction.

Answer:

NO

It is present but not consumed

NO Lowers the activation energy of the reaction

Explanation:

A catalyst is a substance that is present in a chemical reaction and enables the reaction to occur at a faster rte but does not take part n the reaction

Therefore, whereby NO is not consumed, it is the catalyst

It functions by lowering the activation energy

5 0
3 years ago
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