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Accepted Heat of Combustion of Candle (called Paraffin) Wax ( ΔHComb Wax ) is -42.0 KJ/g or -10.0 Kcal/g.
In a separate location in your lab notebook, answer the following questions. Will not be able to answer question in space between unless you cut up the question individually and tape them into your lab notebook with answers between.
1. Give me one of your temperature value, _____________, and how do you know if has the correct number of significant figures (sig fig)?
2. For the combustion ( a chemical reaction with oxygen in air) of candle and then for the water, state if the reaction/process is exothermic or endothermic and give lab observation to justify your answer.
3. Did you directly record the amount of heat given off by the combustion of candle wax? If not, what heat did you directly record?
4. What is the major assumption in this lab?
5. Why was it so important to have the flame almost touching the base of the can?
Level 1 Learners do these question also, CP do not do these questions
6. If it was further away, how would that change the value of the Heat of Combustion of the Candle Wax?
7. If you inadvertently dropped some of the wax before you weighed the candle after burning it, how would that affect the experimental value of the Heat of Combustion of Candle Wax.
8. Why did you need to be sure to raise the temperature of the water as far above room temperature as it's initial water temperature was below room temperature?
9. Besides ensuring the flame is as close to the can as possible, propose another way to minimize the impact on the Heat of Combustion of Candle Wax (minimize the error).