The word equation for the reaction between magnesium and dilute hydrochloric acid is
magnesium + hydrochloric acid → magnesium chloride + hydrogen
The reaction was carried out using the apparatus shown in Figure 11 - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Question 6
The word equation for the reaction between magnesium and dilute hydrochloric acid is
magnesium + hydrochloric acid → magnesium chloride + hydrogen
The reaction wa... show full transcript
Worked Solution & Example Answer:The word equation for the reaction between magnesium and dilute hydrochloric acid is
magnesium + hydrochloric acid → magnesium chloride + hydrogen
The reaction was carried out using the apparatus shown in Figure 11 - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Step 1
Name the apparatus that could be used to measure out 100 cm³ of dilute hydrochloric acid.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Any suitable container for measuring volume of 100 cm³: allowed options include a beaker, pipette, measuring jug.
Step 2
Explain why there is a loss in mass of the flask and contents.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
During the reaction, hydrogen gas is produced, which escapes from the flask. This results in a loss of mass as the gas is released into the atmosphere.
Step 3
Explain, in terms of particles, why the rate of reaction between magnesium ribbon and dilute hydrochloric acid slows as the reaction takes place.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The rate of reaction slows because initially there are many magnesium particles available to react with the acid. As the reaction progresses, fewer magnesium particles remain, leading to fewer collisions between the acid and the remaining magnesium, which reduces the reaction rate over time.
Step 4
State the effect of the higher temperature on the mass loss after two minutes.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The mass loss will be greater at higher temperatures, as increased temperature typically increases the rate of reaction, leading to more efficient gas production.
Step 5
Sketch, on the graph in Figure 12, the line you would expect for this experiment.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The line would be drawn with a steeper gradient to the left of the line for the original experiment, indicating a more rapid mass loss due to the increased reaction rate at higher temperatures.
Step 6
State the effect of a catalyst on a reaction.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A catalyst speeds up the rate of a reaction without being consumed in the process.
Step 7
Devise a simple experiment to find out what happens to the mass of a solid catalyst during a reaction.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One possible experiment would involve bubbling a gas, such as hydrogen, through a solution containing a solid catalyst. The mass of the catalyst should be measured before and after the reaction to determine if it is consumed or remains the same, indicating that a catalyst does not change in mass during the reaction.
