Science: Physical + Chemical Changes- Exam Revision

Created by: Charlotte Ryan
Created on: 14-04-13 21:52

Endothermic Reaction

These are reactions that take in energy from the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder. The temperature decrease can also be detected using a thermometer

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Exothermic Reaction

These are reactions that transfer energy to the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter. The temperature increase can be detected using a thermometer

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Equation for hydrogen

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Equation for water

H20

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Equation for fluorine

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Equation for chlorine

Cl2

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Equation for bromine

Br2

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Equation for iodine

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What is a chemical equation?

A chemical equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written with the reactants on the left side of an arrow and the products of the chemical reaction on the right side of the equat

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Differences between physical and chemical changes:

Physical change= a reversible change where no new substance is formed (e.g melting an ice cube). Chemical change= a change that is not easily reversible and where a new substance is formed (e.g burning toast).

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Other cards in this set

Card 2

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Exothermic Reaction

Card 3

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Card 4

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H20

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Card 5

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Science: Physical + Chemical Changes- Exam Revision