Chapter 5.7 Enthalpies of Formation

Question 1

Enthalpy of Formation

Answer 1

or heat formation

Question 2

The magnitude of any enthalpy change depends on

Answer 2

1. the temperature
2. pressure
3. state ( gas, liquid, or solid)

of the reactants and products

Question 3

To Compare enthalpies of different reactions, we must define a set of conditions called

Answer 3

STANDARD STATE

Question 4

STANDARD STATE of a substance

Answer 4

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 5

The STANDARD ENTHALPY CHANGE of a reaction (

Answer 5

(

Question 5

The STANDARD ENTHALPY OF FORMATION of a compound

Answer 5

Is the change in enthalpy for the reaction that forms one mole of the compound from its elements with all substances states

Question 6

STANDARD STATE of a substance

Answer 6

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 6

STANDARD STATE of a substance

Answer 6

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 7

STANDARD STATE of a substance

Answer 7

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 7

STANDARD STATE of a substance

Answer 7

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 8

STANDARD STATE of a substance

Answer 8

Is its pure form at atmospheric pressure ( 1atm) at 298 K ( 25C)

Question 9

The STANDARD ENTHALPY CHANGE of a reaction

Answer 9

the enthalpy change when all reactants and products are in their standard states

Question 10

The STANDARD ENTHALPY OF FORMATION of a compound

Answer 10

Is the change in enthalpy for the reaction that forms one mole of the compound from its elements with all substances states

Question 11

The STANDARD ENTHALPY OF FORMATION of any element is

Answer 11

zero