Starter quiz
- Use the particle model to describe how particles are arranged and behave in a gas.
- They vibrate in fixed positions
- They are widely spaced and randomly arranged ✓
- They are free to move in any direction ✓
- They are randomly arranged and loose together
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- How many cm³ in 1 dm³?
- 10
- 100
- 1000 ✓
- 10 000
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- State the equation linking mass, volume and density.
- density = mass ÷ volume ✓
- mass = density ÷ volume
- volume = mass ÷ density
- density = mass × volume
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- Convert 10 cm³ into dm³.
- '0.01 dm³' ✓
- Calculate the volume of a cube with a side length of 2 cm. Give your answer in dm³.
- 8
- 0.8
- 0.08
- 0.008 ✓
-
- Convert 2 dm³ into m³.
- '0.002 m³' ✓
Exit quiz
- Match the following terms to their definitions.
- Molar gas volume⇔The volume occupied by 1 mole of a gas ✓
- Mole⇔Unit for amount of substance ✓
- Density⇔A measure of how much matter is located in a particular volume ✓
- Volume⇔How much 3D space matter occupies ✓
- Which of the following factors affect the volume of a gas?
- Temperature ✓
- Pressure ✓
- Catalyst
- Relative mass
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- At room temperature and pressure, 1 mole of any gas occupies a volume of ______ dm³.
- '24' ✓
- State the equation linking molar gas volume, moles and volume of gas.
- volume of gas = moles × molar gas volume ✓
- moles = volume of gas × molar gas volume
- volume of gas = moles ÷ molar gas volume
- moles = molar gas volume ÷ volume of gas
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- Calculate the density of a gas with a mass of 0.060 g and a volume of 24 dm³. Give your answer in g/cm³.
- '1440 g/cm³' ✓
- Calculate the volume of 3.0 mol of hydrogen gas at room temperature and pressure.
- 72 dm³ ✓
- 72 cm³
- 72,000 dm³
- 72,000 cm³ ✓
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Worksheet
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Lesson Details
Key learning points
- Equal amounts in moles of gases occupy the same volume under the same conditions of temperature and pressure.
- The volume of one mole of any gas at room temperature and pressure (20℃ and 1 atmosphere pressure) is 24 dm³.
- The volumes of gaseous reactants and products can be calculated from the balanced equation for the reaction.
- If moles of gas are known, its density can be calculated using molar gas volume and the relationship mass = RFM x moles.
Common misconception
Pupils sometimes rush these calculations and forget to take note of the units.
Remind pupils that units provide the comparison standard for values. Much practice ensuring the correct molar gas volume value is used in calculations is necessary.
Keywords
Volume - is how much 3D space matter occupies. It is usually measured in cm³.
Moles - of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.
Molar gas volume - is the volume occupied by one mole of any gas. It is equal to 24 dm³ or 24 000 cm³ at room temperature and pressure.
Stoichiometry - refers to the molar ratio of the reactants and products in a chemical reaction.
Density - is a property of a substance and is its mass divided by its volume.
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