Chapter 3: Chemical Formulae and Equations
A. Knowledge (Definition, meaning and facts) | Check |
- State the meaning of relative atomic mass based on carbon-12 scale.
- Define a mole.
- State the meaning of molar mass
- State the meaning of molar volume of gas.
- State the meaning of empirical formula.
- State the meaning of molecular formula.
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B. Understanding / Application / Analysis | |
- Explain why we couldn't determine the empirical formula of copper(II) oxide by heating copper powder in a crucible.
- Compare and contrast empirical formula with molecular formula using ethane as an example.
- Vinegar is a dilute ethanoic acid with a molecular formula of CH3COOH.
(a) Find the empirical formula of ethanoic acid.
(b) Find the percentage composition by mass of carbon in ethanoic acid.
- 3.6 g of carbon reacted with 0.8 g of hydrogen to form a compound.
(a) Determine the empirical formula of the compound formed.
(b) Given that the relative molecular mass of the compound is 88 g, find its molecular formula.
[Relative atomic mass: C ,12; H, 1]
- Hydrogen Gas is reacted with 20 g of hot copper(II) oxide powders to produce solid copper and water.
(a) Write the chemical equation for the reaction.
(b) Calculate the maximum mass of solid copper formed.
[Relative atomic mass: Cu, 64; O,16; H,1]
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C. Synthesis (Experiment) | |
- Describe a laboratory experiment to determine the empirical formula of magnesium oxide.
Your answer should include all the precautions and calculations involved.
[Relative atomic mass: Mg, 24; O,16]
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