Photo AI
7. (a) Describe what is seen when chlorine water is added to potassium bromide solution and the mixture shaken - Edexcel - GCSE Chemistry - Question 7 - 2018 - Paper 1
Question 7
7. (a) Describe what is seen when chlorine water is added to potassium bromide solution and the mixture shaken. (b) Chlorine reacts with potassium bromide to form p... show full transcript
Worked Solution & Example Answer:7. (a) Describe what is seen when chlorine water is added to potassium bromide solution and the mixture shaken - Edexcel - GCSE Chemistry - Question 7 - 2018 - Paper 1
Step 1
Describe what is seen when chlorine water is added to potassium bromide solution and the mixture shaken.
Answer
When chlorine water is added to potassium bromide solution, the solution changes color. Initially, the potassium bromide solution is colorless. After the addition of chlorine water, the mixture turns yellow, brown, or orange due to the formation of bromine.
Step 2
In this reaction, chlorine has been reduced. Explain, using the equation, how you know that chlorine has been reduced.
Answer
Chlorine is reduced in the reaction as it gains electrons. In the equation, we see that chlorine (Cl₂) transforms into potassium chloride (2KCl), indicating that chlorine atoms gain electrons to form chloride ions (Cl⁻). This gain of electrons signifies that chlorine undergoes reduction.
Step 3
Step 4
Step 5
Describe a simple experiment to show that charged particles are present in this solution.
Answer
A simple experiment to demonstrate the presence of charged particles in the solution is to set up a circuit using a battery and a light bulb. Immerse electrodes into the solution and connect them to the circuit. If the light bulb lights up, it indicates that the solution conducts electricity, confirming the presence of charged ions in the solution.