6.1.1 Write down the value of Y - NSC Physical Sciences - Question 6 - 2022 - Paper 2
Question 6
6.1.1 Write down the value of Y.
6.1.2 State Le Chatelier's principle.
6.1.3 Changes were made to the temperature of the flask at time t2.
6.1.4 Was the flask HEA... show full transcript
Worked Solution & Example Answer:6.1.1 Write down the value of Y - NSC Physical Sciences - Question 6 - 2022 - Paper 2
Step 1
Write down the value of Y.
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Answer
The value of Y is 2 (mol·dm⁻³).
Step 2
State Le Chatelier's principle.
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Answer
Le Chatelier's principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust itself to counteract the change and restore a new equilibrium.
Step 3
Was the flask HEATED or COOLED?
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Answer
The flask was COOLED.
Step 4
Fully explain the answer to QUESTION 6.1.3.
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Answer
A decrease in temperature favours the exothermic reaction, which, in this case, causes the equilibrium to shift towards the right. As the reaction produces more products (HI), the concentration of H2 and I2 decreases. The observation in the graph indicates that the concentrations of H2 and I2 were decreasing after time t2, supporting that the flask was cooled.
