SSCE VCE Chemistry Rates of Chemical Reactions: A student decided to investigate

Question

A student decided to investigate the effect of temperature on the rate of the following reaction.

$$2HCl(aq) + CaCO_3(s) \rightarrow CaCl_2(aq) + H_2O(l) + CO_2(g)$$

**Effect of temperature on the rate of production of carbon dioxide gas**

**Aim**
To find out how temperature affects the rate of production of carbon dioxide gas, $CO_2$, when a solution of hydrochloric acid, HCl, is added to chips of calcium carbonate, CaCO_3.

**Method**
1. Put 0.6 g of CaCO_3 chips into a conical flask.
2. Put a reagent bottle containing 2 M HCl into a water bath at 5 °C.
3. When the temperature of the HCl solution has stabilised at 5 °C, use a pipette to put 10.0 mL of the HCl solution into the conical flask containing the CaCO_3 chips.
4. Put a balloon over the conical flask and begin timing.
5. When the top of the balloon has inflated so that it is 10 cm over the conical flask, stop timing and record the time.
6. Repeat steps 1–5 using temperatures of 15 °C, 25 °C, 35 °C and 45 °C.

**Results**
The following graph gives the experimental results.

Graph of experimental results

**Temperature (°C)**

The graph shows temperature plotted against time taken for the balloon to rise.

A student decided to investigate the effect of temperature on the rate of the following reaction - VCE - SSCE Chemistry - Question 9 - 2020 - Paper 1

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

Temperature of the HCl solution.

The dependent variable is the rate of production of CO₂ gas / rate of the reaction.

As temperature increases, the rate of reaction increases.

Presenting the data graphically.

Interpretation of graph results.

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