Home › TYS Solutions › O Level Chem › 2022 › P1 Q1

2022 O Level Chem P1 Q1 — Rate of Reaction / Experimental Techniques Solution

Rate of Reaction / Experimental Techniques 2022 O Level Pure Chemistry · Paper 1 · Q1

Question

A student investigates the rate of reaction between a solid and a liquid. During the reaction, the student measures the volume of gas released. The student is provided with a conical flask, a pipette and a balance. Which additional apparatus is needed? 1 stopwatch. 2 gas syringe. 3 thermometer.

A1 and 2
B1 and 3
C1 only
D2 only

Correct answer: A

Video Solution

Explanation

Answer: A. The student already has a conical flask (to hold the reactants), a pipette (to deliver a known liquid volume) and a balance (to mass the solid). To follow a rate of reaction by gas volume, two further pieces of apparatus are needed:

• A gas syringe (item 2) to measure the volume of gas released.
• A stopwatch (item 1) to record the time at each measurement so a rate (volume / time) can be computed.

A thermometer (item 3) is not needed unless the experiment is investigating temperature as a variable — the question is about measuring gas volume only.

So 1 and 2 are needed: option A. B (1 and 3) drops the gas syringe — no way to measure volume. C (1 only) drops both volume-measuring tools. D (2 only) drops the timer — no way to determine a rate.

Get the Sec 3 / Sec 4 recording package

Every O Level Pure Chemistry TYS MCQ solution video, plus full Sec 3 / Sec 4 topic recordings.