Thermochemical equations

Multiple Choice

ΔH means:

• temperature

• calorimetry

• enthalpy

• synergy

Multiple Choice

A negative ΔH means the reaction is:

• endothermic

• exothermic

Multiple Choice

The change of enthalpy is usually expressed in___________.

• kilojoule

• joule

• kilogram

• newton

Multiple Choice

what happens to ΔH when a reaction is reversed?

• it stays the same

• it changes its sign

• it becomes zero

• it doubles

Multiple Choice

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• reactants

• products

Multiple Choice

C+ O₂ --> CO₂ + 60kJ, what is the value for ΔH for the reaction?

• +60 KJ

• -60 KJ

• there's no way to know

Multiple Choice

How much heat is absorbed if
4.0 mole A reacts?
A + 2B + 22.0 kJ → 3C  

• 22 KJ

• 44 KJ

• 66 KJ

• 88 KJ

Multiple Choice

Refer to the following question:

N₂ + 3H₂ --> 2NH₃ + 39 kJ

How much energy would be produced if only 1 mol of hydrogen was reacted with excess nitrogen?

• 117 KJ

• -117 KJ

• 13 KJ

• -13 KJ