Conservation of Mass & Balancing Chemical Equations (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Conservation of Mass & Balancing Chemical Equations
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Law of conservation of mass in chemical reactions

Total mass of reactants equals total mass of products

Why mass is conserved in reactions

No atoms are created or destroyed, just rearranged

Balanced chemical equation meaning

Same number of atoms for each element on both sides

Coefficients in chemical equations

Numbers in front of formulas to balance equations

Why balance chemical equations

To reflect conservation of mass

How to check if equation is balanced using Mr

Sum of Mr of reactants = sum of Mr of products

Relative Formula Mass (Mr) definition

Total mass of all atoms in a compound

How to calculate Mr

Add up relative atomic masses (Ar) of all elements

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