Magnesium reacts with dilute sulfuric acid to form magnesium sulfate and hydrogen gas - Edexcel - GCSE Chemistry - Question 2 - 2021 - Paper 1
Question 2
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 reac... show full transcript
Worked Solution & Example Answer:Magnesium reacts with dilute sulfuric acid to form magnesium sulfate and hydrogen gas - Edexcel - GCSE Chemistry - Question 2 - 2021 - Paper 1
Step 1
(a) State two other variables that should be kept the same.
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Answer
Two other variables that should be kept the same include the concentration of the acid and the mass of magnesium. Maintaining these variables ensures that any changes in the rate of reaction can be attributed solely to the difference in temperature.
Step 2
(b) Which piece of equipment can be used to find the volume of 25 cm³ of sulfuric acid?
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Answer
The measuring cylinder is the correct piece of equipment that can be used to accurately measure the volume of 25 cm³ of sulfuric acid.
Step 3
(c) State how the student will know that the reaction has finished.
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The student will know that the reaction has finished when no more hydrogen gas is being produced. This can be observed by the cessation of gas bubbles or fizzing in the solution.
Step 4
(d) 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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Answer
The reaction at 50°C was faster because, at a higher temperature, the particles have more energy, leading to increased movement and more frequent collisions between the reactant particles. This higher collision frequency results in a faster reaction rate.
