a change in which atoms are rearranged to make new substances.
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reversible
a substance capable of being reversed so that the previous state is restored.
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catalyst
a substance that increases the rate of a chemical reaction
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physical change
a change that is reversible, in which new substances are not made. Examples of physical changes include changes of state and dissolving.
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reactant
a starting substance in a chemical reaction.
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product
a substance that is made in a chemical reaction.
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word equation
a way of representing a chemical reaction simply. The reactants are on the left of an arrow, and the products are on the right. The arrow means 'reacts to make'
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hazard
a possible source of danger.
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risk
the chance of damage or injury from a hazard.
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fuel
a material that burns to transfer useful energy.
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combustion
a chemical reaction in which a substance reacts quickly
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fossil fuel
a fuel made from the remains of animals and plants that died millions of years ago
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non-renewable
some fuels are non-renewable. They form over millions of years and will one day run out.
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oxidation
a chemical reaction in which substances react with oxygen to form oxides.
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decomposition
a chemical reaction in which a compound breaks down to form simpler compounds and/or elements.
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thermal decomposition
a chemical decomposition caused by heat.
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discrete
a variable that can only have whole-number values.
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conservation of mass
in a chemical reaction, the total mass of reactants is equal to the total mass of products. This is called conservation of mass. Mass is conserved in chemical reactions and physical changes.
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balanced symbol equation
in a balanced symbol equation, chemical formulae represent the reactants and products. The equation shows how atoms are rearranged and gives the relative amounts of reactants and products.
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endothermic change
an endothermic change transfers energy from the surroundings.
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exothermic change
an exothermic change transfers energy to the surroundings.
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Other cards in this set
Card 2
Front
a substance capable of being reversed so that the previous state is restored.
Back
reversible
Card 3
Front
a substance that increases the rate of a chemical reaction
Back
Card 4
Front
a change that is reversible, in which new substances are not made. Examples of physical changes include changes of state and dissolving.
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