This question is about rate of reaction - AQA - GCSE Chemistry - Question 3 - 2019 - Paper 2
Question 3
This question is about rate of reaction.
A student investigated the rate of the reaction between magnesium and dilute hydrochloric acid.
The equation for the react... show full transcript
Worked Solution & Example Answer:This question is about rate of reaction - AQA - GCSE Chemistry - Question 3 - 2019 - Paper 2
Step 1
Which state symbol in the equation for the reaction does not represent one of the three states of matter?
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Answer
The symbol 's' for solid does represent a state of matter, while 'aq' represents an aqueous solution. Hence, 'aq' in the equation does not refer to a solid or gas.
Step 2
What two pieces of measuring apparatus could the student use to find the rate of production of hydrogen?
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Answer
Gas syringe
Stopwatch
Step 3
Plot the data from Table 2 on Figure 3.
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Answer
The rate of production of hydrogen gas should be plotted on the y-axis against time in seconds on the x-axis, ensuring all points are connected correctly. A line of best fit should be drawn to indicate the trend.
Step 4
Give three conclusions that can be drawn about the rate of reaction between magnesium and dilute hydrochloric acid in this investigation.
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Answer
The rate of reaction decreases over time, as indicated by the decreasing volume of hydrogen gas produced.
At 60 seconds, the reaction ceases and no further gas is produced, suggesting all magnesium has reacted.
The initial rate of production is highest at the start, indicating that reactants are in greater concentration at the beginning.
Step 5
Which two statements are correct?
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Answer
✓ More bubbles were produced in the first 10 seconds.
✓ The magnesium was used up more quickly.
