1. Electrolysis of hydrochloric acid produces chlorine and hydrogen - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Question 1
1. Electrolysis of hydrochloric acid produces chlorine and hydrogen.
The apparatus used is shown.
(i) Explain what is meant by electrolysis.
(ii) Describe the test... show full transcript
Worked Solution & Example Answer:1. Electrolysis of hydrochloric acid produces chlorine and hydrogen - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Step 1
Explain what is meant by electrolysis.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Electrolysis is the process in which a compound is decomposed into its constituent elements by using direct current (electricity). This involves the application of electrical energy to bring about the chemical decomposition.
Step 2
Describe the test to show that a gas is chlorine.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To test for chlorine gas, damp blue litmus paper can be used. If chlorine gas is present, it will bleach the litmus paper, turning it white. The indicator goes from blue to white indicating the presence of chlorine.
Step 3
State the name of the polymer.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The name of the polymer is poly(chloroethene), commonly known as PVC.
Step 4
Complete the sentence by putting a cross (X) in the box next to your answer.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct option for the formation of silver chloride as a precipitate in an equation is D AgCl(s).
Step 5
State how the total mass of the apparatus after the reaction will compare with the total mass of the apparatus before the reaction.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The total mass of the apparatus after the reaction will remain the same as the total mass of the apparatus before the reaction because mass is conserved in a chemical reaction.
Step 6
Write the balanced equation for the reaction of silver nitrate solution with dilute hydrochloric acid.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
