Chemistry 5070/41 — October/November 2023

Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Experimental Contexts · Use of Techniques, Apparatus and Materials · Observations and Measurements · Planning Experiments and Investigations · Analysis, Conclusions and Evaluation · Qualitative Analysis

Q16MUse of Techniques, Apparatus and MaterialsExperimental ContextsFree sample

A student investigates the rate of reaction between calcium carbonate and dilute hydrochloric acid.

Fig. 1.1 shows part of the apparatus the student uses.

The student determines the rate of reaction by measuring the volume of carbon dioxide produced in a fixed time.

Fig. 1.1

(a)

Name apparatus X.

______

(b)

The student has incorrectly positioned the delivery tube in the apparatus shown in Fig. 1.1.

Complete Fig. 1.2 to show:

the correct position of the delivery tube
the rest of the apparatus the student uses to collect and measure the volume of gas produced.

Fig. 1.2

(c)

The student collects $48.0\text{ cm}^3$ of carbon dioxide during the first 2 minutes.

Calculate the mean rate of reaction, in $\text{cm}^3\text{ / s}$ , during the first 2 minutes.

mean rate of reaction = ______ $\text{cm}^3\text{/ s}$

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3 more questions

Q2Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations14M
Q3Qualitative Analysis · Experimental Contexts · Observations and Measurements14M
Q4Planning Experiments and Investigations · Experimental Contexts · Use of Techniques, Apparatus and Materials6M

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