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4U Investigation: Reaction Rates Names:_______________

Limestone is composed mainly of calcium carbonate, CaCO3(s). Limestone formations are also geological indicators of petroleum deposits. Geologists use hydrochloric acid in a field test to detect limestone. The reaction between hydrochloric acid and calcium carbonate produces carbon dioxide gas.

CaCO3(s) + 2HCl(aq) CaCl2(aq) + H2O(l) + CO2(g)

Purpose: To determine the reaction rate at various points during the reaction of hydrochloric acid and calcium carbonate, using given data.

Hypothesis:

Write a hypothesis that explains the change in rate of a chemical reaction over time. Then, write a prediction for the shape of the curve for the given data, based on this hypothesis.

 Data:

[HCl (aq)] mol/L	Time (s)
1.90	0.0
1.40	60.0
1.10	120.0
0.90	180.0
0.80	240.0
0.75	300.0
0.72	360.0

Table 1: Concentrations of Hydrochloric acid over time

Analysis:

Your group is to complete a CER chart to explain the change in rate of a chemical reaction over time.

The Claim(s) would be based on your hypothesis, the evidence would be graph/observations from the graph and the reasoning is a written explanation of what is occurring in the graph – including shape of the graph and any supporting calculations.

Your CER chart is due by the end of the period.

Claim: ____ / 1 Mark

Evidence (Graph): _____ / 4 Marks

Reasoning: _____ / 5 Marks

Total: _____ /10 Marks