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Question 15

A student wants to investigate the reaction of potassium with water using the setup shown below.

Diagram showing a large piece of potassium being dropped into an open glass trough of water, with a person standing directly over the trough looking down.

They plan to use the following method:

  • Step 1: Fill a large glass trough half-full with water.
  • Step 2: Cut a large slice of potassium (about 1 cm3) and use tweezers to drop it directly into the water.
  • Step 3: Stand directly over the trough to observe the flame and intensity of the reaction.

A teacher says that this method is not safe because the reaction is too vigorous. Explain changes that should be made to Step 2 and Step 3 to make the experiment safer.

[3]

Group 1 Questions

  1. GCSE
  2. /Chemistry
  3. /Group 1

Practise Edexcel GCSE Chemistry Group 1 with exam-style questions for Foundation and Higher tier. 51 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank