Heat of Reaction

Question 1

What symbol is used to indicate the heat change taking place when a chemical reaction occurs?

Answer 1

Delta H

Question 2

What does the symbol delta H indicate?

Answer 2

It indicates the heat change taking place during a chemical reaction

Question 3

What does a negative delta H value indicate?

Answer 3

This indicates the reaction is exothermic

Question 4

What does a positive delta H value indicate?

Answer 4

This indicates the reaction is endothermic

Question 5

What SI unit of measurement is used along side delta H?

Answer 5

Kilojoules (kj)

Question 6

Is moles or molecules used when measuring the heat of a reaction?

Answer 6

Moles

Question 7

Define heat of reaction

Answer 7

Heat of reaction is the heat change when the numbers of moles of reactants indicated in the balanced equation for the reaction react completely

Question 8

What happens if the number of moles in the balanced equation are changed?

Answer 8

The heat of reaction also changes

Question 9

What specific detail has to be given in relation to the products and reactions during a heat of reaction equation?

Answer 9

Their physical states MUST be given

Question 10

Why is it required to give the physical states of the products and reactions during a heat of reaction equation?

Answer 10

As changing the physical states of either reactants or products can alter the value of delta H

Question 11

What is a thermochemical equation?

Answer 11

An equation where there is a heat change