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A student decided to investigate the effect of temperature on the rate of the following reaction - VCE - SSCE Chemistry - Question 9 - 2020 - Paper 1
Question 9
A student decided to investigate the effect of temperature on the rate of the following reaction. 2HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g) Part of the st... show full transcript
Worked Solution & Example Answer:A student decided to investigate the effect of temperature on the rate of the following reaction - VCE - SSCE Chemistry - Question 9 - 2020 - Paper 1
Step 1
Temperature of the HCl solution.
Answer
The temperature of the HCl solution must be measured accurately using a thermometer before it is added to the calcium carbonate chips. For example, starting from 5 °C, subsequent experiments should be carried out at 15 °C, 25 °C, 35 °C, and 45 °C. Ensure the solution has stabilized at the desired temperature.
Step 2
Step 3
Explain how temperature affects the reaction rate.
Answer
As temperature increases, the rate of reaction generally increases. This is due to higher temperatures providing more energy to the reacting particles, resulting in an increased frequency and energy of collisions. More particles can overcome the activation energy barrier, leading to a greater proportion of successful reactions.
Step 4
Data presentation and graph requirements.
Answer
When presenting the data, it is important to use a graph with temperature on the horizontal axis and time on the vertical axis, which reflects the relationship between these variables. Ensure the graph is clearly labeled and use best practices for visual representation.
Step 5
Identify anomalies in the data.
Answer
Students should be cautious of any anomalies or inconsistencies in the data collected. If the results do not follow the expected trend, it is essential to analyze potential reasons, such as experimental error or fluctuations in temperature that could have influenced the reaction rate.