science : chemical reactions
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8 Terms
What is a chemical reaction?
A process that creates new substances.
Name 3 signs of a chemical reaction.
Colour change, gas/bubbles and temperature change.
What is conservation of mass
Mass is not created or destroyed in a chemical reaction.
Mass of reactants = mass of products
What does collision theory say?
Particles must collide with enough energy for a reaction to occur.
How does temperature affect reaction rate?
Higher temperature usually makes reactions faster
How does concentration affect reaction rate?
Higher concentration gives faster reactions
What does a catalyst do?
Lowers the energy needed for a reaction
What happens in combustion?
Fuel reacts with oxygen, producing energy; hydrocarbons produce CO₂ and water.