Conservation of Mass & Balanced Chemical Equations (AQA GCSE Chemistry Combined Science): Flashcards

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Conservation of Mass & Balanced Chemical Equations
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Law of conservation of mass

Total mass of reactants = total mass of products

Why mass is conserved in reactions

No atoms created or destroyed, just rearranged

Balanced chemical equation meaning

Same number of atoms of each element on both sides

Coefficients in chemical equations

Numbers in front of formulas to balance atoms

Purpose of balancing equations

To reflect conservation of mass

First step to balance an equation

Write the unbalanced equation

What to adjust when balancing equations

Coefficients (numbers in front of formulas)

Sum of MrM_r in balanced equations

Sum of MrM_r of reactants = sum of MrM_r of products

Relative formula mass (MrM_r)

Total mass of all atoms in a compound

How to calculate MrM_r

Add up ArA_r of all elements in the compound

Balanced equation: N2N_2 + ? H2H_2 → ? NH3NH_3

N2+3H2→2NH3N_2 + 3H_2 → 2NH_3

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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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