Lab Quiz A For Heat Of Combustion Of Candle Wax

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2. Did you observation directly the mass of the water. If yes, write down the value of the water's mass in the space below. If not, what did you observation directly so that you can calculate the mass of the water.

2. Did you observe directly the mass of the water. If yes, write down the value of the water's mass in the space below. If not, what did you observation directly so that you can calculate the mass of the water.

Using your understanding of this lab and information in your lab notebook, answer the following questions in the space provided.

1. Write in the blank one of your temperatures that you recorded in this lab, _________________° C .

2. Did you observe directly the mass of the water. If yes, write down the value of the water's mass in the space below. If not, what did you observation directly so that you can calculate the mass of the water.

___________________________________________________________________

3. If you inadvertently dropped some of the wax before you weighed the candle after burning it, how would it change the experimental value of the Heat of Combustion of Candle Wax?

a. Incorrect value ( of Heat of Combustion of Candle Wax) will be LESS than experiment value that did not loss wax
b. Incorrect value ( of Heat of Combustion of Candle Wax) will be GREATER than experiment value that did not loss wax
c. Would not have an effect on experimental value of the Heat of Combustion of Candle Wax.
d. Do not have enough information to answer question.

4. Which substance released the energy as the reaction occurred?

a. Candle Wax b. Water c. Air (around candle & can) d. Index card that candle was placed on.

5. Looking at your equations for Absolute error and percent error, what does a negative percent error mean?

6a. What was the big assumption (that most likely caused the greatest error) in the lab? _______________________________

6b. Explain why raising the temperature of the water as far above room temperature as it started below room temperature would reduce the error in the lab (see question 6a)?

7. On the back of this page, show all appropriate work (including units) to determine the Heat of Combustion of Candle Wax for this lab (DO NOT HAVE TO SHOW PERCENT ERROR CALCULATION)