CART Thermochemistry and Energy 2

Question 1

Which calorimetry equation relates heat, mass, specific heat, and temperature change?

Accepted Answer

q = mcΔT

Answer

q = mΔH

Answer

q = nRT

Answer

q = PΔV

Question 2

In a coffee-cup calorimeter experiment, the temperature of the solution rises after mixing two reactants. The reaction is:

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Neutral

Answer

Reversible only

Question 3

The heat of combustion of propane (C₃H₈) is –2220 kJ/mol. How much heat is released by burning 0.5 mol of propane?

Accepted Answer

–1110 kJ

Answer

–4440 kJ

Answer

+1110 kJ

Answer

+2220 kJ

Question 4

Which symbol represents the heat of a reaction measured at constant volume?

Accepted Answer

ΔU (or ΔE)

Answer

ΔH

Answer

ΔS

Answer

ΔG

Question 5

Bond breaking in a chemical reaction requires ________ energy, while bond forming ________ energy.

Accepted Answer

absorbs; releases

Answer

releases; absorbs

Answer

absorbs; absorbs

Answer

releases; releases

Question 6

If the products of a reaction have higher enthalpy than the reactants, the ΔH for the reaction is:

Accepted Answer

Positive

Answer

Negative

Answer

Zero

Answer

Cannot be determined