6. (a) Describe the test to show that a gas is chlorine - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Question 6
6.
(a) Describe the test to show that a gas is chlorine.
(b) Bromine reacts with hydrogen to form hydrogen bromide.
Hydrogen bromide dissolves in water to form a so... show full transcript
Worked Solution & Example Answer:6. (a) Describe the test to show that a gas is chlorine - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Step 1
Describe the test to show that a gas is chlorine.
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
To test for chlorine gas, a piece of damp blue litmus paper is held in the gas. If chlorine is present, it will bleach the litmus paper, turning it white.
Step 2
State the name of the solution formed.
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
The name of the solution formed is hydrogen bromide.
Step 3
Predict the colour and state of astatine at room temperature.
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
Astatine is predicted to be a dark grey or black solid at room temperature.
Step 4
Explain the observations shown in the table.
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
In the table, bromine starts as an orange solution and turns brown due to the formation of bromine gas in the solution. Chlorine, initially pale green, also turns brown, indicating a similar interaction, while iodine remains brown. This indicates a phenomenon where the halogens are reacting and potentially forming complex mixtures.
Step 5
Write the balanced equation for this 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!
