Difference between revisions of "Chemical Reaction"
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: If a '''chemical reaction''' gives off more energy than it needs to start then it is called an [[Exothermic Reaction]]. | : If a '''chemical reaction''' gives off more energy than it needs to start then it is called an [[Exothermic Reaction]]. | ||
: If a '''chemical reaction''' takes in more energy than it gives out then it is called an [[Endothermic Reaction]]. | : If a '''chemical reaction''' takes in more energy than it gives out then it is called an [[Endothermic Reaction]]. | ||
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| + | ===Examples=== | ||
Revision as of 16:32, 23 September 2018
Contents
Key Stage 2
Meaning
A chemical reaction is when one substance changes into another.
About Chemical Reactions
- Most chemical reactions are irreversible.
- Chemical reactions usually cause a change in temperature.
- Chemical reactions you should know are:
Key Stage 3
Meaning
A Chemical Reaction is when the atoms in molecules break their bonds and form new bonds, usually with other atoms.
About Chemical Reactions
- In a chemical reaction the atoms rearrange to form a new substance.
- Chemical reactions often need some energy to start, like combustion where the fuel needs to be heated to start.
- If a chemical reaction gives off more energy than it needs to start then it is called an Exothermic Reaction.
- If a chemical reaction takes in more energy than it gives out then it is called an Endothermic Reaction.