Thermochemistry Quiz

What is the definition of an exothermic reaction?

• Process that decreases the temperature of surroundings

• Process that releases energy from the system to surroundings

• Process that increases the temperature of surroundings

• Process that absorbs energy from the surroundings

What is the total enthalpy, H, of a system called?

• Absolute enthalpy

• Change in enthalpy

• Specific enthalpy

• Standard enthalpy

What is the standard enthalpy of formation for an element in its standard state?

• Dependent on the element

• Negative

• Positive

• Zero

What is the enthalpy change which occurs when one mole of a compound is formed from its elements under standard conditions?

• Enthalpy of formation

• Enthalpy of neutralization

• Enthalpy of combustion

• Enthalpy of reaction

What is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius called?

• Enthalpy change

• Heat of reaction

• Heat capacity

• Specific heat

Which type of calorimeter is used to measure heat change for noncombustion reactions?

• Constant volume calorimeter

• Coffee cup calorimeter

• Bomb calorimeter

• Constant pressure calorimeter

What is the function of a calorimeter?

• To absorb heat from the surroundings

• To measure the enthalpy change in chemical reactions

• To avoid the heat flow to or from surroundings

• To increase the heat flow to surroundings

What is the standard enthalpy of formation of methane, CH4?

• -74.8 kJ/mol

• 187.6 kJ/mol

• -131.3 kJ/mol

• -285.8 kJ/mol

What is the standard enthalpy of combustion of the transition from C(s, graphite) to C(s, diamond)?

• -393.5 kJ/mol

• 395.41 kJ/mol

• 15.3 kJ/mol

• -1220 kJ/mol

What is the enthalpy change for the reaction between methane and chlorine?

• -53.4 kJ

• 470250 J

• 226 kJ

• 57.9 kJ