1. (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Question 1
1. (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it.
Chlorine and hydrogen are formed.
chlorine ... show full transcript
Worked Solution & Example Answer:1. (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Step 1
Give the name of this process in which substances, such as hydrochloric acid, are decomposed by a direct electric current.
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Answer
The name of this process is electrolysis.
Step 2
Describe what happens when a burning splint is applied to a mixture of hydrogen and air in a test tube.
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Answer
When a burning splint is applied to a mixture of hydrogen and air in a test tube, the flame will burn with a characteristic 'pop' sound, indicating the presence of hydrogen gas. Additionally, the splint may ignite, and water vapor will be produced as a byproduct of the combustion.
Step 3
Complete the sentence by putting a cross (X) in the box next to your answer. An acid is present in the stomach of humans. This acid is
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Answer
The correct answer is B hydrochloric acid.
Step 4
Which of these could cure indigestion caused by excess acid? Put a cross (X) in the box next to your answer.
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Answer
The correct answer is C calcium carbonate.
Step 5
Explain how an indigestion remedy works when it cures acid indigestion.
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Answer
An indigestion remedy like calcium carbonate works by neutralizing excess stomach acid. It reacts with the acid, raising the pH level in the stomach. This alleviates pain and discomfort by forming water and a salt, which relieves symptoms associated with acid indigestion.
Step 6
Complete the word equation for the reaction of magnesium oxide with nitric acid.
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Answer
The word equation is:
magnesium oxide + nitric acid → magnesium nitrate + water.
