Chemical Changes
4 past-paper questions on Chemical Changes · examined 2023–2025.
20253 questions
Two changes are described. change 1 Copper is added to concentrated nitric acid. Nitrogen dioxide is produced. change 2 Concentrated sulfuric acid is added to sugar. The change that occurs cannot be reversed. Which row is correct?
Two changes are described. Which row is correct?
Which process is a chemical change?
20231 question
Octane, C8H18, is a hydrocarbon. Which part of this description shows that the change is a chemical change?
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