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 hydro... 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 process is known as 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, one of the following might occur:
The burning splint will ignite the hydrogen gas, producing a pop sound, indicating that a combustion reaction has taken place.
It may also produce a squeaky sound when the hydrogen burns.
Additionally, water vapor may be formed as a product 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 hydrochloric acid (B).
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 suitable remedy is calcium carbonate (C).
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 the excess acid in the stomach, which raises the pH level back to normal.
It acts as an alkali that reacts with the acid, thereby alleviating pain and discomfort associated with acid indigestion.
Step 6
Complete the word equation for the reaction of magnesium oxide with nitric acid.
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