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Unit Quiz

Quantitative Chemistry

This quiz will help you to assess your learning of key concepts and knowledge in this unit.

Q1.What is the theoretical yield of a product?

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Q2.H₂ (g) + Cl₂ (g) → 2HCl (g). Starting with 2 g of hydrogen, what mass of hydrogen chloride would be produced? (Relative atomic masses: H = 1; Cl = 35.5)

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Q3.Which of these is NOT a reason why the percentage yield is less than 100%?

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Q4.Which of these is the number of atoms in a mole?

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Q5.Which of these reactions for the production of ethanol has an atom economy of 100%?

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Q6.How do you calculate atom economy?

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Q7.How can you improve the atom economy of a reaction?

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Q8.Which of these is a reason for wanting high atom economy?

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Q9.What is the atom economy for the production of Copper Oxide (CuO) using the reaction shown? CuCO₃ --> CuO + CO₂ The Ar for Cu=63.5, C=12, O=16

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Q10.What phrase is given to the reactant that runs out first in a reaction?

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Q11.Which of these is a valid reason for less than 100% yield in a reaction between magnesium and oxygen to produce magnesium oxide?

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Q12.Which statement is a correct definition for atom economy?

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Q13.One way to produce copper chloride salts is shown by the reaction: CuO + 2HCl -> CuCl₂ + H₂O. How many moles of acid are needed for every mole of product?

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Q14.The formula of magnesium sulfate is MgSO₄. Calculate the relative formula mass of magnesium sulfate. Relative atomic masses: Mg = 24; S= 32; O = 16.

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Q15.Calculate the relative formula mass of iron oxide, Fe₂O₃. Relative atomic masses: O = 16; Fe = 56.

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Q16.A chemist was asked to identify a nitrogen compound. The chemist carried out an experiment to find the relative formula mass (Mr) of the compound. The Mr of the compound was 44. Relative atomic masses: N = 14; O = 16. What is the formula of the compound?

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Q17.Calculate the percentage of O in Be(OH)₂. Be = 9; O = 16; H = 1.

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Q18.What type of reaction happens when a compound breaks down due to heating?

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Q19.A metal oxide has a relative formula mass (Mr) of 81. The formula of this metal oxide is XO. The relative atomic mass (Ar) of oxygen is 16. Calculate the relative atomic mass (Ar) of metal X.

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Q20.Which of the following equations is balanced?

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Q21.Which number is missing to balance the equation : MgO + ___HCl → MgCl₂ + H₂O

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Q22.What is the concentration of a solution with 0.15 g in a volume of 400 cm³?

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Q23.What is the mass of copper chloride in 50 cm³ of a 300 g/dm³ solution?

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Q24.How many atoms are in 1 mole of sodium?

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Q25.What is the mass of 2 moles of Na₂O? Ar of Na = 23, O = 16

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Q26.What volume does 1 mole of a gas occupy?

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Q27.How many cm³ in 24 dm³?

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Q28.Calculate the volume of gas in 12 g of CO₂? Relative atomic mass of C = 12; O = 16

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Q29.Calculate the mass of 1.5 moles of MgSO₄. Relative atomic mass of Mg = 24; S = 32; O 16

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Q30.Calculate the number of moles in 35 g NaCl. Relative formula mass Na = 23; Cl = 35.5

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Q31.Calculate the number of moles in 14 cm³ of 2 M HCl

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