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
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 oxygen ... show full transcript
Worked Solution & Example Answer: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
The correct answer is D: an acid reacts with a metal oxide to form 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 in the acid, forming a colorless solution.
There will be bubbles or effervescence as carbon dioxide gas is produced during the reaction.
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: extCuCO3+2extHNO3→extCu(NO3)2+extH2extO+extCO2
Step 4
Explain what is meant by electrolysis.
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Answer
Electrolysis is a chemical process that uses direct electric current to cause the decomposition of a compound or substance. This occurs when an electric current passes through an electrolyte, leading to the separation of elements.
Step 5
Describe a test to show the gas is oxygen.
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Answer
To test for oxygen, you can use a glowing splint. If you insert a glowing splint into a jar containing the gas, the splint will relight if oxygen is present.
