ExpertEasy1 markShort Answer
AQA GCSE · Question 01.3 · Chemical changes
Complete the sentence.
The colour change when water is added to anhydrous copper sulfate is white to ______.
Complete the sentence.
The colour change when water is added to anhydrous copper sulfate is white to ______.
How to approach this question
The question describes a reversible reaction. The forward reaction (heating hydrated copper sulfate) goes from blue to white. The reverse reaction is adding water to anhydrous copper sulfate. Determine the colour change for this reverse process.
Full Answer
The reaction is reversible, as shown by the symbol ⇌. The forward reaction is: hydrated copper sulfate (blue) → anhydrous copper sulfate (white) + water. The reverse reaction is adding water to anhydrous copper sulfate. Therefore, the colour change will be the reverse of the forward reaction, from white back to blue.
Common mistakes
✗ Stating the colour change for the forward reaction (blue to white) instead of the reverse reaction.
Practice the full AQA GCSE Chemistry Foundation Tier Paper 2
60 questions · hints · full answers · grading
More questions from this exam
Q01.1This question is about copper sulfate. Blue copper sulfate turns white when it is heated. The wor...EasyQ01.2What does the symbol ⇌ mean?EasyQ01.4A student heats 2.5 g of hydrated copper sulfate in a test tube. 0.9 g of water is given off. The...EasyQ01.5Calculate the percentage of water contained in 2.5 g of hydrated copper sulfate.
(Mass of water =...MediumQ01.6What is the chemical formula for Copper sulfate?Easy