4. Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Question 4
4. Complete the sentence by putting a cross (X) in the box next to your answer.
An acid reacts with a metal oxide to form
A salt and hydrogen only
B salt and oxyge... show full transcript
Worked Solution & Example Answer:4. Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
D a salt and water only
Step 2
State two things you would see when solid copper carbonate reacts with dilute nitric acid.
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Answer
The copper carbonate will dissolve, disappearing from view.
Effervescence will occur as carbon dioxide gas is released, resulting in fizzing or bubbling.
Step 3
Write the balanced equation for the reaction of copper carbonate with dilute nitric acid.
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Answer
The balanced equation is:
CuCO3+2HNO3→Cu(NO3)2+H2O+CO2
Step 4
Explain what is meant by electrolysis.
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Answer
Electrolysis is the process of using an electric current to bring about a chemical change, typically the decomposition of a compound into its elements. It requires a solution (electrolyte) that conducts electricity, allowing ionic movement.
Step 5
Describe a test to show the gas is oxygen.
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Answer
To test for oxygen, insert a glowing splint into the test tube containing the gas. If the splint reignites, this indicates the presence of oxygen.
