CHM143 - THERMOCHEMISTRY (P1)

In system X, both energy and matter cannot be exchanged with the surrounding. What is system X?

• Open system

• Closed system

• Isolated system

The transfer of thermal energy between objects of different temperatures is called heat.

• TRUE

• FALSE

Unit of heat in the SI system is

• J

• KCal

• Cal

• g

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction. The temperature began at 15°C and ended at 27°C. If the reaction is our system, the system is endothermic.

• TRUE

• FALSE

If the ΔH value is less than zero than reaction will be

• Exothermic

• Endothermic

• May or may not be Exothermic or Endothermic

• None of these

The amount of heat energy required to change the temperature of 12 g of gold from 15°C to 45°C is -47 J. What is the specific heat capacity of gold?

• 17000 J/(g °C)

• 1600 J/(g °C)

• 0.13 J/(g °C)

• 0.065 J/(g °C)

The enthalphy change when 1 mole of a substance is completely burnt in excess oxygen is known as

• Standard enthalphy of neutralization

• Standard enthalphy of formation

• Standard enthalphy of solution

• Standard enthalphy of combustion