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 state symbol that does not represent one of the three states of matter is (s), which stands for solid.
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
To plot the data, mark the time in seconds on the x-axis and the rate of production of gas in cm³/s on the y-axis. All points from Table 2 should be accurately plotted, ideally within a small tolerance. After marking the points, draw a line of best fit that represents the trend of the decreasing rate of gas production.
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, indicating that as magnesium is consumed, the reaction slows down.
The rate of production of gas is highest at the beginning of the reaction and decreases as it progresses, showing a non-linear relationship.
The reaction effectively stops producing gas at 60 seconds, as indicated by a rate of 0.0 cm³/s.
Step 5
Which two statements are correct?
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Answer
More bubbles were produced in the first 10 seconds.
