C2 - Energy Transfer In Reactions Flashcards
What is an example of an exothermic reaction?
Combustion.
What is combustion?
Burning fuels.
What other type of reactions are exothermic (apart from combustion)? [2]
1) Neutralisation.
2) Oxidation.
Name 2 everyday uses of exothermic reactions.
1) hand warmers.
2) self-heating cans.
What is the definition of an endothermic reaction?
Energy is taken in from the surroundings in the form of heat. It is shown by a fall in temperature.
Are endothermic reactions more or less common than exothermic reactions?
Less common.
What is an example of a type of endothermic reaction?
Thermal decomposition.
What does calcium carbonate thermally decompose to become?
Quicklime.
Name an everyday use of endothermic reactions.
Sports injury packs.
Name an example of a reversible reaction.
The thermal decomposition of hydrated copper sulfate.
What does anhydrous mean?
Without water.
What does hydrous mean?
With water.
What happens if you heat blue hydrated copper(II) sulfate crystals? What type of reaction is this?
White anhydrous copper(II) sulfate powder is left.
Endothermic.
What happens if you add after to white anhydrous copper(II) sulfate powder? What type of reaction is this?
You get blue hydrated copper(II) sulfate crystals.
Exothermic.
How do you get blue crystals again from white copper sulfate powder?
Add a few drops of water.
