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Chemical Reactions - Coggle Diagram
Chemical Reactions
During a chemical reaction
A new substance is formed
A change of energy is involved
The change is usually difficult to reverse
usually involves a change in temperature
Total mass of the reactants = the mass of products
The speed at which it takes place is known as its reaction rate
Depends on factors including temperature
Can be explained by a particle model
Collisions between particles cause chemical reactions
The more collisions, the more likely to react
The faster the particles move the more likely to result in chemical change
Reactions
Endothermic
Heat is taken in
Exothermic
Heat is given out
Physical Changes
No new substance is formed
Chemical Changes
Always involves a new substance being formed
Activation
The activation energy of a reactant is the minimum energy needed to start that chemical reaction