GCSE Edexcel Chemistry Combined Science Reactions of acids: 1. Magnesium reacts with dilute

Question

1. Magnesium reacts with dilute sulfuric acid to form magnesium sulfate and hydrogen gas.

A student wants to find out the effect of temperature on the rate of this reaction.

The student used the following method.

step 1 pour 25 cm³ of dilute sulfuric acid into a conical flask
step 2 warm the acid until its temperature is 30°C
step 3 add a piece of magnesium to the acid
step 4 start a stopwatch
step 5 wait until the reaction has finished
step 6 stop the stopwatch
step 7 repeat steps 1–6 but at 50°C.

a) The student kept the volume of sulfuric acid the same when they repeated the method at 50°C.

State two other variables that should be kept the same.

b) Which piece of equipment can be used to find the volume of 25 cm³ of sulfuric acid?
    A balance
    B measuring cylinder
    C ruler
    D thermometer

c) State how the student will know that the reaction has finished.

d) The reaction at 50°C was faster than the reaction at 30°C.

Give one reason, in terms of particles, why the reaction at 50°C was faster than the reaction at 30°C.

1. Magnesium reacts with dilute sulfuric acid to form magnesium sulfate and hydrogen gas - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1

Worked Solution & Example Answer:1. Magnesium reacts with dilute sulfuric acid to form magnesium sulfate and hydrogen gas - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1

State two other variables that should be kept the same.

Which piece of equipment can be used to find the volume of 25 cm³ of sulfuric acid?

State how the student will know that the reaction has finished.

Give one reason, in terms of particles, why the reaction at 50°C was faster than the reaction at 30°C.

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