3 - Thermochemistry

The heat released by one mole of a substance as it is converted from a liquid to a solid (freezing).

• Molar heat of fusion

• Molar heat of solidification

• Conversion factor

• Molar heat of vaporization

Tags

9-12-PS1.B-6

The heat released by one mole of a substance as it is converted from a liquid to a solid (freezing).

• Molar heat of solidification

• Heat of vaporization

• Molar heat of fusion

• Heat of condensation

Tags

9-12-PS1.B-6

Calculate the heat absorbed in kJ, when 31.6 g of ice at 0°C is completely melted.

(molar heat of fusion = 6.01 kJ/mol)

Mathematical Equivalence

ON

Tags

9-12-PS1.B-6

What is a numerical ratio of equivalent measurements used to convert a quantity from one system of units to another?

• Change of state

• Conversion factor

• Temperature

• Phase

Tags

9-12-PS1.B-6

9-12-PS1.B-8

In the transition from liquid to solid, is energy ​ ​ (a)   ?​

• released
• absorbed

Tags

9-12-PS1.B-8

In the transition from solid to liquid, is energy ​ (a)   ?

• absorbed
• released

Tags

9-12-PS1.B-6

9-12-PS1.B-7

How much energy is released when one mole of water at 0°C changes from liquid to solid?

• 6.01 kJ

• -6.01 kJ

• 4.18 J/g°C

Tags

9-12-PS1.B-6

9-12-PS1.B-7

9-12-PS1.B-8

The heat absorbed by one mole of a substance as it is converted from a liquid to a gas (boiling).

• molar heat of vaporization

• molar heat of condensation

• specific heat

• surroundings

Tags

9-12-PS1.B-6

9-12-PS1.B-8

9-12-PS1.B-7

The heat released by one mole of a substance as it is converted from a gas to a liquid (condensing).

• surroundings

• molar heat of vaporization

• molar heat of condensation

• specific heat

Tags

9-12-PS1.B-6

9-12-PS1.B-7

9-12-PS1.B-8

What is common to all the substance in the table except oxygen?

• Oxygen is diatomic

• The heat of vaporization is substantially higher than the heat of fusion

• Intermolecular forces are higher than the others

Tags

9-12-PS1.B-6

9-12-PS1.B-8

9-12-PS1.B-7