Energetics general questions

Question 1

CO2(g) + 3H2(g) –> CH3OH(g) + H2O(g)
Suggest one environmental advantage of manufacturing methanol fuel by this reaction

Answer 1

The carbon dioxide (produced on burning methanol) is used up in this reaction

Question 2

The student said correctly that using a thermometer with an overall uncertainty for the rise in temperature of ±0.5 °C was adequate for this experiment.
Explain why this thermometer was adequate for this experiment

Answer 2

Idea that heat loss is more significant issue
OR Idea that temperature change/rise is (significantly / much) bigger than uncertainty

Question 3

This experiment can be repeated by using a different volume of water that would result in a more accurate value for the enthalpy of combustion because there would be a reduction in the heat lost.
State a change in the volume of water that would cause a reduction in heat loss and explain your answer

Answer 3

Change in volume: Increase in volume OR
Smaller increase in T above room temperature
Or increased contact between calorimeter and water
Or smaller heat loss by evaporation / from the surface