Physical Chemistry (3.2)

What are the standard conditions?

• 298k

• 273k

• 100kPa

• 10kPa

What is TRUE for exothermic reactions?

• Loses heat to its surroundings

• Has negative enthalpy change

• Products have a lower enthalpy

• Always involves water

What is TRUE for endothermic reactions?

• Enthalpy of products is greater than reactants

• The system gains heat from surroundings

• Has positive enthalpy change

• Produces ice

The minimum energy required to start a reaction by breaking the bonds in the reactants.

For an endothermic enthalpy diagram, the reactants are ..... the products

For an exothermic enthalpy diagram, the reactants are ..... the products

What are standard conditions for enthalpy?

• 273K

• 298K

• 100kPa

• 1moldm-3

Convert 25 Celsius to Kelvin?

• 298k

• 273k

• 225K

• 289K

q = mc ΔT

What does q stand for and in what unit is it measured? 

• Heat exchanged to surroundings (Joules)

• Heat exchanged to surroudnings (kilojoules)

• Temperature change ( Celcius)

• Temperature Change ( Kelvin)

q = mc ΔT

What does m stand for and in what unit is it measured? 

• Mass (Grams)

• Mass (Kilograms)

• Temperature change (Celcius)

• Temperature Change ( Kelvin)