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When a small amount of solid ammonium chloride is shaken with water, a colourless solution forms - Edexcel - GCSE Chemistry - Question 1 - 2012 - Paper 1
Question 1
When a small amount of solid ammonium chloride is shaken with water, a colourless solution forms. (i) What type of change has occurred? Put a cross (✗) in the box ... show full transcript
Worked Solution & Example Answer:When a small amount of solid ammonium chloride is shaken with water, a colourless solution forms - Edexcel - GCSE Chemistry - Question 1 - 2012 - Paper 1
Step 1
Step 2
Describe how you could measure this change in temperature.
Answer
To measure the change in temperature, you can use a thermometer. Place the thermometer in the solution before the solid is added to record the initial temperature. After the solid is dissolved completely, take a reading of the temperature again to find the final temperature. The difference between these two readings will indicate the temperature change.
Step 3
Step 4
Step 5
State the difference you would see when the marble chips react with warm, instead of cold, acid.
Answer
When the experiment is conducted using warm acid instead of cold, the marble chips would fizz faster, resulting in a more vigorous reaction. This is due to increased kinetic energy at higher temperatures, leading to more frequent collisions between the acid and the marble chips.
Step 6
Explain what must be done to the marble chips so that the reaction with the warm, dilute hydrochloric acid is even faster.
Answer
To make the reaction with warm dilute hydrochloric acid even faster, the marble chips should be broken into smaller pieces. This increases the surface area available for the reaction, allowing for more collisions between the acid and the marble particles.