Exothermic enthalpy changes

Question 1

A reaction is exothermic when

Answer 1

reaction is exothermic when the products have less energy than the reactants

Question 2

Heat energy is given ………by the reaction to the surroundings

Answer 2

off

Question 3

The temperature of the environment …………- this can be measured with a thermometer

Answer 3

increases

Question 4

The energy of the system

Answer 4

decreases

Question 5

There is an enthalpy …………….during the reaction so ΔH is …………

Answer 5

decrease

negative

Question 6

Exothermic reactions are thermodynamically possible (because

Answer 6

the enthalpy of the reactants is higher than that of the products)

Question 7

Thermodynamically feasible

Answer 7

according to all that we know about energy and entropy changes in reactions it is reasonable to suppose that it can happen.

Question 8

Exothermic reactions are thermodynamically possible (because the enthalpy of the reactants is higher than that of the products)

However, if ………………… the reaction may not occur
In this case the reaction is ……………..

Answer 8

the rate is too slow,

kinetically controlled