The minimum amount of energy required so that a reaction can take place
What is a product
The substances produced by the chemical reaction
What is a hypothesis
An idea you can test
What does the term rate of reaction mean?
change in concentration of reactant or product per unit time
What does the Law of conservation of mass state?
Matter cannot be created or destroyed it can only be converted to another form
What does the term high concentration mean
There is alot of the substance in terms of the volume
Define an endothermic reaction
One that takes in energy as heat
What is a reactant
the substances used by the chemical reacction
Give 2 examples of a physical change
Ice melting, crushing a can, boiling water, shredding paper
When a metal and an acid react what products form?
salt and hydrogen
Name two factors that can affect the rate of a reactiom
surface area, catalyst, temperature, concentration of reactant
When an acid and a carbonate react what products form?
Salt, water and Carbon dioxide
What is a catalyst
A chemical that speeds up a reaction without being used up itself
Define an exothermic reaction
One that gives out energy as heat
give 2 examples of chemical change
Burning wood, rusting iron, baking a cake, digesting food
Define the term chemical reaction
happens when the elements in a set of material break apart and/or join together to form a different set of material
What is the difference between chemical and physical change
Physical chnage matter chnages state or shape but no new substance is formed and chemical change is when a chemical reaction occurs and a new substance is forme
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