The starter and exit quiz of the lesson “Mass in a chemical reaction”, from the unit “Calculations involving masses” (Year 10 Science) by Oak National Academy.
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Oak National Academy
12 questions
Given the relative atomic masses (Ar): C (12), O (16)Calculate the relative molecular mass (Mr) of carbon dioxide (CO₂).
What does the conservation of mass in a chemical reaction imply?
If 20g of sodium reacts fully with 15g of chlorine, how much sodium chloride is produced?
For the equation __ N₂ + __ H₂ → __ NH₃, select the correct coefficients to balance it.
What does the equation 2H₂ + O₂ → 2H₂O tell us?
Given the relative atomic mass values (Ar): H (1), S (32), O (16)Calculate the relative formula mass (Mr) of sulfuric acid.
Match the following terms with their correct definitions:
True or false? In a chemical reaction, the total mass of all the products can be different to the total mass of all the reactants
Balance the following equation: __ H₂ + __ O₂ → __ H₂O.
2Mg + O₂ → 2MgO.Relative atomic mass (Ar): Mg (24), O (16).48 g of magnesium reacts with excess oxygen.Calculate the mass of MgO produced.
2Na + Cl₂ → 2NaCl.Relative atomic mass (Ar): Na (23), Cl (35.5).46 g of Na reacts with excess chlorine.Calculate the mass (g) of NaCl produced (3 s.f.).
H₂ + SO₃ → H₂SO₄.Relative atomic mass (Ar): H (1), S (32), O (16).8.0 g of SO₃ reacts with excess hydrogen.Calculate the mass (g) of H₂SO₄ produced (2 s.f.).
