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A student used the apparatus in Figure 1 to investigate the rate of the reaction between a metal and dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1

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A student used the apparatus in Figure 1 to investigate the rate of the reaction between a metal and dilute hydrochloric acid. Pieces of the metal were placed in di... show full transcript

Worked Solution & Example Answer:A student used the apparatus in Figure 1 to investigate the rate of the reaction between a metal and dilute hydrochloric acid - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1

Step 1

What type of measuring device should be used to obtain more accurate results?

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Answer

To achieve more accurate measurements of the volume of hydrogen gas produced, a 100 cm³ measuring cylinder or a gas syringe should be used. The gas syringe is preferable due to its smaller graduations and higher resolution compared to the measuring cylinder.

Step 2

Calculate the rate of gas production at 90 seconds.

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Answer

At 90 seconds, the volume of hydrogen gas produced is 29 cm³. The rate of gas production can be calculated using the formula:

extRate=VolumeTime ext{Rate} = \frac{\text{Volume}}{\text{Time}}

Substituting the values into the equation gives:

Rate=29 cm390 s=0.3222 cm3/s\text{Rate} = \frac{29\, \text{cm}^3}{90\, \text{s}} = 0.3222\, \text{cm}^3 / \text{s}

Therefore, the rate of hydrogen gas production at 90 seconds is approximately 0.3222 cm³ per second.

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