Quiz 7: Energy,rate and Equilibrium

Under normal conditions,which of the following would have the highest entropy?

Which one of the following actions can alter the activation energy of a reaction?

Consider the reversible reaction: N₂(g)+ 3H₂(g)⇌ 2NH₃(g) What is the correct expression for the equilibrium constant,Keq,for this reaction?

A granola bar contains 185 nutritional Calories.How many kilojoules is this? [1 cal = 4.18 J]

Ammonia is synthesized industrially by the reaction of nitrogen and hydrogen in the presence of an iron catalyst according to the reaction equation below.What effect would removing the iron catalyst have on this reaction? 3H₂(g)+ N₂(g) 2NH₃(g)

In kinetics,the order of a reaction

Which term describes the measure of the randomness or disorder of a chemical system?

Which one of the following,if changed,would change the value of the equilibrium constant,Keq,of a reaction?

One effect of a catalyst being added to a reaction mixture is

Ethylene glycol has a specific heat of 0.578 cal/(g•°C).If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy,what will the temperature increase be?

The reaction A + 2B + C → D + 2E is first order in reactant A,first order in B,and second order in C.What is the rate law equation for this reaction?

In the potential energy diagram for a chemical reaction,what is the name used for the unstable species corresponding to the top of the energy barrier separating reactants from products?

When a cold-pack is activated,a chemical reaction occurs and the temperature of the pack contents drops sharply.Which of the following is a correct description of the reaction occurring in the pack?

Consider the reversible reaction: A(g)⇌ 2B(g) At equilibrium,the concentration of A is 0.381 M and that of B is 0.154 M.What is the value of the equilibrium constant,Keq?

In general,which state of matter has the lowest entropy?

When a sample of aqueous hydrochloric acid was neutralized with aqueous sodium hydroxide in a calorimeter,the temperature of 100.0 g of water surrounding the reaction increased from 25.0°C to 31.5°C.If the specific heat of water is 1.00 cal/(g•°C),calculate the quantity of energy in calories involved in this neutralization reaction.

Which of the following statements concerning the reversible reaction below is FALSE? N₂O₄(g)⇌ 2NO₂(g)

A reversible reaction is said to have reached equilibrium when which of the following conditions is established?

Which of the following is the equilibrium constant expression for the reaction? 2NO(g)+ O₂(g)→ 2NO₂(g)

In the industrial synthesis of ammonia,the equilibrium constant expression may be written as: Calculate the value of this equilibrium constant,if the equilibrium concentration of nitrogen in the reaction mixture at 600°C if [N₂] = 4.53 M; [H₂] = 2.49 M; and [NH₃] = 7.62 M. K_eq =