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Name 2 signs of a chemical reaction
colour change, bubbles (gas formed), precipitation (solid forming), energy change
Give me an example of a reaction where a colour change occurs.
Making toast/frying egg etc.
Name 2 ways that you can change the speed of a reaction.
concentration, particle size, catalyst and temperature
Explain why increasing concentration makes a reaction faster.
more particles, more reactions
Explain why increasing temperature makes a reaction faster.
more energy, faster particles, more reactions
A reaction with concentrated acid is too fast. How could I slow it down?
dilute the acid
A reaction with lumps of calcium carbonate is too slow. How could I speed it up?
decrease particle size
A reaction at room temperature is too slow. How do I speed it up?
Heating it
What is a catalyst?
substance that can be added to a reaction to speed it up without being used up
Where can enzymes be found?
in all living things
What does an indicator do?
Changes colour to show if a substance is acid/alkali
How could you make your own indicator?
boil cabbage
What is the pH of water?
7
What is the pH of an acid?
less than 7
What is the pH of an alkali?
more than 7
What colour would universal indicator turn in acid?
red/orange/yellow
