Edexcel IGCSE Chemistry Precise Observations and Measurements Questions

Practise Edexcel IGCSE Chemistry precise observations by recognising colour, effervescence and gas syringe evidence during reactions.

Exam points

State a solution colour accurately, such as blue for copper(II) sulfate solution.
Recognise that a reaction has stopped when fizzing ends or no more gas is collected.

[Maximum number: 1]

A student uses this apparatus to investigate the rate of reaction between dilute sulfuric acid and an excess of small pieces of zinc.

Figure for Question Edexcel IGCSE Chemistry Precise Observations and Measurements Questions question 1 — Edexcel IGCSE Chemistry

This is the student's method.
Step 1 use $50 \mathrm{~cm}^{3}$ of dilute sulfuric acid
Step 2 add approximately 5 g of small zinc pieces to the sulfuric acid
Step 3 quickly connect the gas syringe
Step 4 record the reading on the gas syringe every 30 seconds until the reaction stops

State how the student would know when the reaction stops.

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Edexcel IGCSE Chemistry Precise Observations and Measurements Questions question 1