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Worksheet StudioPractice pack · Ages 7-9
Solids, liquids & gases
Take your time. Show your thinking.
1. In which state of matter do particles have the highest average kinetic energy at a given pressure: gas (steam) or solid (ice)?
Solid → Liquid → Gas · Particle Arrangement
2. Which state of matter spreads out to fill the entire volume and shape of any closed container: gas or solid?
Solid → Liquid → Gas · Particle Arrangement
3. Does the total mass of an ice cube change when it melts completely in a sealed cup: No (mass is conserved) or Yes (it doubles)?
Solid → Liquid → Gas · Particle Arrangement
4. How does increasing the temperature of a liquid affect its rate of evaporation: it speeds up evaporation, or it stops evaporation?
Solid → Liquid → Gas · Particle Arrangement
5. Which metallic element is unusual because it is a liquid at standard room temperature (20 °C): mercury or iron?
Solid → Liquid → Gas · Particle Arrangement
6. Which technique separates a mixture of coloured inks on filter paper based on how far each dye travels with a solvent: chromatography or decanting?
Solid → Liquid → Gas · Particle Arrangement
7. Is rusting of iron in moist air a reversible physical change or a chemical change that forms a new substance (iron oxide)?
Solid → Liquid → Gas · Particle Arrangement
8. What is the change of state from a solid to a liquid when heated (e.g. ice turning into liquid water): melting or condensation?
Solid → Liquid → Gas · Particle Arrangement
9. In which state of matter can a substance be easily compressed into a much smaller volume (such as air in a bicycle pump): gas or liquid?
Solid → Liquid → Gas · Particle Arrangement
10. At standard atmospheric pressure, at what temperature does pure liquid water boil into steam: 100 °C or 50 °C?
Solid → Liquid → Gas · Particle Arrangement
11. Which state of matter has both a fixed shape and a fixed volume: solid, liquid or gas?
Solid → Liquid → Gas · Particle Arrangement
12. What is the key difference between boiling and evaporation: boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature, or they are identical?
Solid → Liquid → Gas · Particle Arrangement
12 questions · Seed 43 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Solids, liquids & gases
Answers and reasoning. Review before teaching.
1. In which state of matter do particles have the highest average kinetic energy at a given pressure: gas (steam) or solid (ice)?
Gas (steam)
Particles in the gaseous state at higher temperature move fastest and have the greatest kinetic energy.
2. Which state of matter spreads out to fill the entire volume and shape of any closed container: gas or solid?
Gas
Gas particles are far apart and move rapidly in all directions.
3. Does the total mass of an ice cube change when it melts completely in a sealed cup: No (mass is conserved) or Yes (it doubles)?
No (mass is conserved)
The same number of water molecules are present before and after melting, so mass is conserved.
4. How does increasing the temperature of a liquid affect its rate of evaporation: it speeds up evaporation, or it stops evaporation?
It speeds up evaporation
Higher temperature means more particles have enough kinetic energy to escape from the liquid surface.
5. Which metallic element is unusual because it is a liquid at standard room temperature (20 °C): mercury or iron?
Mercury
Mercury melts at −38.8 °C, so it is liquid at room temperature.
6. Which technique separates a mixture of coloured inks on filter paper based on how far each dye travels with a solvent: chromatography or decanting?
Chromatography
Paper chromatography separates dissolved pigments by their differing solubilities and affinities for the paper.
7. Is rusting of iron in moist air a reversible physical change or a chemical change that forms a new substance (iron oxide)?
Chemical change
Iron reacts chemically with oxygen and water to form hydrated iron(III) oxide (rust).
8. What is the change of state from a solid to a liquid when heated (e.g. ice turning into liquid water): melting or condensation?
Melting
Heating gives solid particles enough energy to break free of their fixed lattice and melt.
9. In which state of matter can a substance be easily compressed into a much smaller volume (such as air in a bicycle pump): gas or liquid?
Gas
Because gas particles have large empty spaces between them, gases are easily compressed.
10. At standard atmospheric pressure, at what temperature does pure liquid water boil into steam: 100 °C or 50 °C?
100 °C
The normal boiling point of pure water is 100 °C.
11. Which state of matter has both a fixed shape and a fixed volume: solid, liquid or gas?
Solid
In a solid, particles are packed closely in fixed positions and only vibrate.
12. What is the key difference between boiling and evaporation: boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature, or they are identical?
Boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature
Evaporation is a surface process below the boiling point; boiling forms vapour bubbles throughout the bulk liquid.
12 questions · Seed 43 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Solids, liquids & gases
Take your time. Show your thinking.
1. In which state of matter do particles have the highest average kinetic energy at a given pressure: gas (steam) or solid (ice)?
Solid → Liquid → Gas · Particle Arrangement
2. Which state of matter spreads out to fill the entire volume and shape of any closed container: gas or solid?
Solid → Liquid → Gas · Particle Arrangement
3. Does the total mass of an ice cube change when it melts completely in a sealed cup: No (mass is conserved) or Yes (it doubles)?
Solid → Liquid → Gas · Particle Arrangement
4. How does increasing the temperature of a liquid affect its rate of evaporation: it speeds up evaporation, or it stops evaporation?
Solid → Liquid → Gas · Particle Arrangement
5. Which metallic element is unusual because it is a liquid at standard room temperature (20 °C): mercury or iron?
Solid → Liquid → Gas · Particle Arrangement
6. Which technique separates a mixture of coloured inks on filter paper based on how far each dye travels with a solvent: chromatography or decanting?
Solid → Liquid → Gas · Particle Arrangement
7. Is rusting of iron in moist air a reversible physical change or a chemical change that forms a new substance (iron oxide)?
Solid → Liquid → Gas · Particle Arrangement
8. What is the change of state from a solid to a liquid when heated (e.g. ice turning into liquid water): melting or condensation?
Solid → Liquid → Gas · Particle Arrangement
9. In which state of matter can a substance be easily compressed into a much smaller volume (such as air in a bicycle pump): gas or liquid?
Solid → Liquid → Gas · Particle Arrangement
10. At standard atmospheric pressure, at what temperature does pure liquid water boil into steam: 100 °C or 50 °C?
Solid → Liquid → Gas · Particle Arrangement
11. Which state of matter has both a fixed shape and a fixed volume: solid, liquid or gas?
Solid → Liquid → Gas · Particle Arrangement
12. What is the key difference between boiling and evaporation: boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature, or they are identical?
Solid → Liquid → Gas · Particle Arrangement
12 questions · Seed 43 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Solids, liquids & gases
Answers and reasoning. Review before teaching.
1. In which state of matter do particles have the highest average kinetic energy at a given pressure: gas (steam) or solid (ice)?
Gas (steam)
Particles in the gaseous state at higher temperature move fastest and have the greatest kinetic energy.
2. Which state of matter spreads out to fill the entire volume and shape of any closed container: gas or solid?
Gas
Gas particles are far apart and move rapidly in all directions.
3. Does the total mass of an ice cube change when it melts completely in a sealed cup: No (mass is conserved) or Yes (it doubles)?
No (mass is conserved)
The same number of water molecules are present before and after melting, so mass is conserved.
4. How does increasing the temperature of a liquid affect its rate of evaporation: it speeds up evaporation, or it stops evaporation?
It speeds up evaporation
Higher temperature means more particles have enough kinetic energy to escape from the liquid surface.
5. Which metallic element is unusual because it is a liquid at standard room temperature (20 °C): mercury or iron?
Mercury
Mercury melts at −38.8 °C, so it is liquid at room temperature.
6. Which technique separates a mixture of coloured inks on filter paper based on how far each dye travels with a solvent: chromatography or decanting?
Chromatography
Paper chromatography separates dissolved pigments by their differing solubilities and affinities for the paper.
7. Is rusting of iron in moist air a reversible physical change or a chemical change that forms a new substance (iron oxide)?
Chemical change
Iron reacts chemically with oxygen and water to form hydrated iron(III) oxide (rust).
8. What is the change of state from a solid to a liquid when heated (e.g. ice turning into liquid water): melting or condensation?
Melting
Heating gives solid particles enough energy to break free of their fixed lattice and melt.
9. In which state of matter can a substance be easily compressed into a much smaller volume (such as air in a bicycle pump): gas or liquid?
Gas
Because gas particles have large empty spaces between them, gases are easily compressed.
10. At standard atmospheric pressure, at what temperature does pure liquid water boil into steam: 100 °C or 50 °C?
100 °C
The normal boiling point of pure water is 100 °C.
11. Which state of matter has both a fixed shape and a fixed volume: solid, liquid or gas?
Solid
In a solid, particles are packed closely in fixed positions and only vibrate.
12. What is the key difference between boiling and evaporation: boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature, or they are identical?
Boiling happens throughout the liquid at its boiling point, whereas evaporation happens at the surface at any temperature
Evaporation is a surface process below the boiling point; boiling forms vapour bubbles throughout the bulk liquid.
12 questions · Seed 43 · Age guidance, not curriculum certification