Chapter 5.1

Question 1

Exothermic reaction

Answer 1

A reaction where heat energy is transferred from a system to the surroundings

Question 2

Endothermic reaction

Answer 2

A reaction where the system takes in heat energy from the surroundings

Question 3

Enthalpy change

Answer 3

The amount of heat energy taken in/given out in a chemical reaction

Question 4

What is the change in H for an exotherjic reaction?

Answer 4

Negative

Question 5

What is the change in H for an endothermic reaction?

Answer 5

Positive

Question 6

True or false? Total energy is conserved in a chemical reaction

Answer 6

True

Question 7

Stability

Answer 7

Used to describe the relative energies of reactants and products in a chemical reaction. Less energy means more stability

Question 8

What are the standard conditions for chemical reactions?

Answer 8

100 kPa

Question 9

Standard enthalpy change of reaction

Answer 9

The enthalpy change when molar amounts of reactants react together under standard conditions to give products

Question 10

Standard enthalpy change of combustion

Answer 10

The enthalpy change when one mole of a substance is completely burnt in oxygen under standard conditions

Question 11

Enthalpy change of neutralization

Answer 11

The enthalpy change when one mole of water molecules are formed when an acid reacts with an alkali under standard conditions

Question 12

Enthalpy change of solution

Answer 12

The enthalpy change when one mole of solute is dissolved in excess solvent to form a solution of infinite dilution under standard conditions

Question 13

Infinite dilution

Answer 13

A state where any further dilution of the solution produces no further enthalpy change