Balanced equations and masses (AQA GCSE Chemistry Combined Science): Flashcards

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Balanced equations and masses
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What do balanced equations show

Particles in reactants rearranged to make products

Atoms in chemical reactions

Never lost or made, only rearranged

Law of conservation of mass

No atoms lost or made; total mass stays constant

Total mass of reactants vs products

Equal - reactants = products

Relative atomic mass of H

11

Relative atomic mass of C

1212

Relative atomic mass of O

1616

Relative atomic mass of Cl

35.535.5

Relative atomic mass of Ca

4040

Why mass appears to change in reactions

Gases enter or leave the reaction system

Effect when CO2CO_2 gas escapes

Container becomes lighter but mass not lost

How to verify an equation is balanced

Check total masses on both sides are equal

Matter in chemical reactions

Cannot be created or destroyed, only rearranged

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Measurement, Mass & Equations

Calculating Mass of Substances

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Measurement, Mass & Equations

Calculating Mass of Substances

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Measurement, Mass & Equations

Calculating Mass of Substances

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Measurement, Mass & Equations

Calculating Mass of Substances

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