AP Chem Unit 4 In Class Review

Front

What is the molar enthalpy of fusion of water?

Back

+6.01 kJ/mol

Front

What is the change in enthalpy for a 0.500 mol sample of water undergoing fusion?

Back

-3.00 kJ

Front

What is the reaction for the combustion of carbon monoxide with oxygen?

Back

2 CO(g) + O2(g) → 2 CO2(g) ΔH = -302.4 kJ/mol

Front

How do you calculate the energy change for the reaction of three moles of O2 with four moles of CO?

Back

Multiply the ΔH by the ratio of moles: -302.4 kJ/mol * (4/2) = -604.8 kJ/mol

Front

What is ΔHf°?

Back

Standard enthalpy of formation, the change in enthalpy when one mole of a compound is formed from its elements in their standard states.

Front

What is the significance of the enthalpy change in a chemical reaction?

Back

It indicates whether the reaction is exothermic (releases heat) or endothermic (absorbs heat).

Front

What does a negative ΔH value indicate about a reaction?

Back

The reaction is exothermic, meaning it releases energy.

Front

What is thermal equilibrium?

Back

The state in which two objects in contact with each other reach the same temperature.

Front

In which direction does heat flow to reach thermal equilibrium?

Back

From high temperature to low temperature.

Front

What is the relationship between temperature and kinetic energy in gases?

Back

As temperature increases, the average kinetic energy of gas molecules increases.