42
CHEMACTIVITY 8C: HEAT IN OR HEAT OUT?
POSSIBLE CLICKER QUESTIONS
After CTQ 10:
1. When sodium hydroxide dissolves in water, heat is given off. The process is
2. When sodium hydroxide dissolves in water, heat is given off. Hrxn is
3. If Hrxn is positive the reaction is
4. Hrxn for the combustion of CH4 is -802 kJ. How much heat is given off if 2 mol CH4 is
burned?
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)
5. Hrxn for the combustion of CH4 is -802 kJ. How much CH4 must be burned to produce 2406
kJ of heat?
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)
43