SSCE VCE Chemistry Measuring Changes in Chemical Reactions: A senior Chemistry student bough

Question

A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market. The label on the packet had no information on the energy content of the biscuits. 
The student decided that he would measure the energy content of a Krispy Krackers biscuit by burning it under a can of water and measuring the temperature rise of the water. 
Having performed a similar experiment in the class, he knew that when the biscuit was burnt, heat energy would be lost to the environment. To increase the accuracy of the result, the canister was first burnt and the temperature rise of the water from that measured. Then he repeated the experiment by burning butane gas while using the equipment decided to generate the test result for the biscuit. 
The experimental set-up and the results for Part 1 of the experiment are shown below.

Part 1 – The heat content of butane.
1. Measure the initial mass of a butane canister.
2. Measure the mass of a metal can, add 250 mL of water and re-weigh.
3. Set up the apparatus as in the diagram and measure the initial temperature of the water.
4. Burn the butane gas for five minutes.
5. Immediately measure the final temperature of the water.
6. Measure the final mass of the butane canister when cool.

Results table for Part 1

Quantity | Measurement
--- | ---
mass of empty can | 52.14 g
mass of can + water before combustion | 303.37 g
mass of butane canister before heating | 260.15 g
mass of butane canister after heating | 259.79 g
mass of temperature of water | 22.1 °C
final temperature of water | 32.7 °C

A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market - VCE - SSCE Chemistry - Question 10 - 2016 - Paper 1

Worked Solution & Example Answer:A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market - VCE - SSCE Chemistry - Question 10 - 2016 - Paper 1

1. Measure the initial mass of a butane canister

2. Measure the mass of a metal can, add 250 mL of water and re-weigh

3. Set up the apparatus as in the diagram and measure the initial temperature of the water

4. Burn the butane gas for five minutes

5. Immediately measure the final temperature of the water

6. Measure the final mass of the butane canister when cool

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