Quiz Ch 8

Question 1

 The energy of the forward reaction is 53 kJ the energy of the back reactions 82 kJ is it exothermic or endothermic?

Answer 1

Exothermic. Because the heat of the reaction is the forward reaction minus the back reaction which would be the 53 kJ -82 kJ = -29 kJ since it’s negative it’s exothermic.

Question 2

What is the lower energy in the product than reactant? What is the higher energy in the product than the reactant?
hint EXO ENDO ….

Answer 2

ENDO = + result of energy = higher energy (heat) in product than reactant
EXO = - result of energy = lower energy (heat) in the product than the reactant

Question 3

In the equilibrium constant KEQ what is in the numerator and what is in the denominator?
N2(g) + 3Br2(g) <—> 2NBr3(g)

Answer 3

Product is in the numerator reactant in the denominator 
[NBr3]²
Keq= ———————-
[N2] [Br2]³

Question 4

In the equilibrium constant Keq what is in the square brackets?
N2(g) + 3Br2(g) <—> 2NBr3(g)

Answer 4

The molar concentration at equilibrium, the elements in the reaction and the concentration subscript.
[NBr3]²
Keq= ———————-
[N2] [Br2]³

Question 5

In an equilibrium constant, Keq, What is raised to the power equal to the component’s coefficient? What is the power of outside the brackets?
N2(g) + 3Br2(g) <—> 2NBr(g)

Answer 5

The molar concentration of each component at equilibrium.
[NBr3]²
Keq= ———————-
[N2] [Br2]³

Question 6

What does not appear in an equilibrium, constant Keq?

Answer 6

Solids or liquids do not appear in the equilibrium, constant expression