Chemical Reactions
Chemistry: AQA GCSE Higher, topic 1.1.3
Chemical Reactions
The key features of a chemical reaction are:
Compounds are broken up or formed
At least 1 new substance is created
Measurable energy change
No atoms are created or destroyed
Test yourself on Chemical Reactions
What happens during chemical reactions?
What is not a feature of a chemical reaction?
Two liquids are stirred together and warm up slightly, but no new substance appears and the atoms stay arranged exactly as before. What can be concluded about this process?
Two substances are mixed together, but both stay chemically unchanged and can be separated afterwards, with no compounds broken apart or newly formed. According to the key features of a chemical reaction, has a chemical reaction taken place?
What is true about energy changes and chemical reactions?