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1 (a) Chemical cells produce a voltage - Edexcel - GCSE Chemistry - Question 1 - 2022 - Paper 1
Question 1
1 (a) Chemical cells produce a voltage. A chemical cell can be made by placing the metals copper and zinc in a beaker of sodium chloride solution. Figure 1 shows a... show full transcript
Worked Solution & Example Answer:1 (a) Chemical cells produce a voltage - Edexcel - GCSE Chemistry - Question 1 - 2022 - Paper 1
Step 1
Describe what will happen to the brightness of the light bulb over a long period of time.
Answer
Over a long period of time, the brightness of the light bulb will gradually decrease. This occurs because the chemical reactions between the copper and zinc in the sodium chloride solution will produce a decreasing voltage as the reactants are consumed. Eventually, the bulb may become very dim or go out completely as the reaction reaches completion.
Step 2
Step 3
Draw a labelled diagram in the box to show the arrangement of copper and zinc atoms in this alloy.
Answer
The labelled diagram should depict copper atoms represented as small circles, with 70% of the area filled by copper. The zinc atoms, represented as slightly larger circles, should occupy 30% of the area. The arrangement should show a random distribution of atoms to indicate the alloy structure.