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Question 9

A student plans to demonstrate the reaction of potassium with water using the setup shown below.

Unsafe setup for potassium and water reaction

They plan to use the following method:

  • Step 1: Use bare hands to pick up a large 2 cm3 cube of potassium from the storage oil and drop it directly into a glass trough half-filled with water.
  • Step 2: Stand directly behind a safety screen but peer closely over the top of the open trough to observe the flame and intensity of the reaction.

A teacher states that this method is extremely dangerous because potassium is highly reactive.

Explain the changes that should be made to Step 1 and Step 2 to make the experiment safe.

[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