A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market - VCE - SSCE Chemistry - Question 10 - 2016 - Paper 1
Question 10
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... show full transcript
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
Step 1
1. Measure the initial mass of a butane canister.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To start, weigh the empty butane canister using a digital scale. The initial mass recorded is 260.15 g.
Step 2
2. Measure the mass of a metal can, add 250 mL of water and re-weigh.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Weigh the empty metal can and then fill it with 250 mL of water. The mass of the can with water is recorded as 303.37 g.
Step 3
3. Set up the apparatus as in the diagram and measure the initial temperature of the water.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Position the melting ice in contact with the can and measure the initial temperature of the water with a digital thermometer. The recorded initial temperature is 22.1 °C.
Step 4
4. Burn the butane gas for five minutes.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use the lighter to ignite the butane under the metal can, ensuring it burns for exactly five minutes to allow maximum energy transfer to the water.
Step 5
5. Immediately measure the final temperature of the water.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
After the combustion period, quickly measure the final temperature of the water. The final temperature is noted to be 32.7 °C.
Step 6
6. Measure the final mass of the butane canister when cool.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Once the butane canister has cooled, weigh it again. The final mass recorded is 259.79 g.
