Conservation of Mass & Balanced Chemical Equations (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes

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Conservation of Mass & Balanced Chemical Equations
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What does the law of conservation of mass state?

Mass of reactants equals mass of products

What happens to atoms during a chemical reaction?

They are rearranged to form new substances

Why must chemical equations be balanced?

Same no. of atoms on both sides needed

What are coefficients in a chemical equation?

Numbers in front of formulas

What is the first step in balancing a chemical equation?

Write the unbalanced equation

In unbalanced N2+H2→NH3N_2 + H_2 \rightarrow NH_3, how many H atoms are on the right side?

3

What is the balanced equation for N2+H2→NH3N_2 + H_2 \rightarrow NH_3?

N2+3H2→2NH3N_2 + 3H_2 \rightarrow 2NH_3

In N2+3H2→2NH3N_2 + 3H_2 \rightarrow 2NH_3, how many hydrogen atoms are on each side?

6

What is relative formula mass (MrM_r)?

Total mass of all atoms in a compound

How is relative formula mass calculated?

Add up relative atomic masses (ArA_r)

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Measurement, Mass & Equations

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Calculating Mass of Substances

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