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.
\[ 2 ext{HCl}(aq) + ext{CaCO}_3(s) \rightarrow ext{CaCl}_2(aq) ... 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.
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Answer
The temperature of the HCl solution is to be maintained at specific values: 5 °C, 15 °C, 25 °C, 35 °C, and 45 °C. The aim is to systematically change this temperature to investigate its effect on the reaction rate.
Step 2
Dependent variable.
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Answer
The dependent variable is the rate of production of CO2 gas, which can be measured by the time it takes for the balloon to inflate by 10 cm.
Step 3
How temperature affects the rate of reaction.
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Answer
As the temperature increases, the kinetic energy of the particles also increases, leading to a greater frequency of collisions between reactant particles. This results in a higher rate of reaction, as described by the collision theory, emphasizing that reactions occur more rapidly at higher temperatures.
Step 4
Consistency of the data.
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Answer
There is not a consistent trend in the rate of reaction regarding time. The rate is higher at 15 °C than at 25 °C, indicating that other factors may be influencing the reaction at these temperatures, and the data should be presented accurately for clarity.
Step 5
Graphing the results.
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The data obtained from different temperatures should be represented visually. Ensure that the independent variable is on the horizontal axis (temperature) and the dependent variable (time) is on the vertical axis, and use consistent scales to enhance readability.
