science

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what is a chemical reaction? give examples
a change in which atoms are rearranged to go create new substances eg combustion
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2 differences between chemical reactions and physical changes
chemical reactions are not reversible. physical changes are. chemical reactions transfer energy physical changes don't
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what is meant by endothermic reaction
a chemical reaction that transfers energy from the surrounding
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what is an exothermic reaction
a chemical reaction which transfers energy to surroundings
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what happens to particles in a chemical reaction
they get rearranged in a different way
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explain the law of conservation of mass
In any chemical reaction the total mass of reactants the total mass of reactants = the total mass of the products
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what is meant by thermal decomposition
when a substance breaks down on heating
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what is a decomposition reaction
a chemical reaction in which a compound breaks to form simpler compounds and for elements
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4 signs of chemical reaction
flames or sparks, new smell, temperature changes, fizzing or popping
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what is meant by physical changes
a reversible change in which no new substances are made eg. changes of state/ dissolving
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Card 2

Front

2 differences between chemical reactions and physical changes

Back

chemical reactions are not reversible. physical changes are. chemical reactions transfer energy physical changes don't

Card 3

Front

what is meant by endothermic reaction

Back

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Card 4

Front

what is an exothermic reaction

Back

Preview of the front of card 4

Card 5

Front

what happens to particles in a chemical reaction

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