States of Matter & the Particle Model — Practice · Grade 6 Science
Chapter: Matter, Mixtures & Water PropertiesWhat this practice covers
By the end of States of Matter & the Particle Model you should be able to:
- I can describe the arrangement, spacing and motion of particles in each state.
- I can read a melting point and a boiling point as evidence about attraction between particles.
- I can explain why temperature stops rising while a substance is melting.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: particle model, evaporation, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
No. Container shape affects height; compare volume with an appropriate method before claiming loss.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
Particle spacing decreases; the model does not require individual particles to shrink.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
No. Surface evaporation occurs below boiling; its rate depends on conditions such as temperature, airflow, and exposed area.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
The same water remains within the boundary; state and arrangement change, not the amount of matter.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
Melting in the closed sample changes arrangement while retaining its 50 g of water. The open dish loses 6 g from the measured liquid; evaporation is a possible pathway into the air. The water has not been destroyed. Without further records, the mass loss alone does not exclude a spill or specify the evaporation rate over a particular time.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
Visibility is not the definition of matter. Gas particles have mass and occupy space; a suitable comparison or measurement can show these properties.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- Solid particles are completely motionless.
- particle model: A simplified explanation of matter using tiny moving constituents and their arrangement.
- A gas has no mass because it is invisible.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
particle model: A simplified explanation of matter using tiny moving constituents and their arrangement.
A simplified explanation of matter using tiny moving constituents and their arrangement. Melting in the closed sample changes arrangement while retaining its 50 g of water. The open dish loses 6 g from the measured liquid; evaporation is a possible pathway into the air. The water has not been destroyed. Without further records, the mass loss alone does not exclude a spill or specify the evaporation rate over a particular time.
Problem 8
- A gas has no mass because it is invisible.
- Solid particles are completely motionless.
- evaporation: A change from liquid to gas at a surface, possible below boiling.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
evaporation: A change from liquid to gas at a surface, possible below boiling.
A change from liquid to gas at a surface, possible below boiling. Melting in the closed sample changes arrangement while retaining its 50 g of water. The open dish loses 6 g from the measured liquid; evaporation is a possible pathway into the air. The water has not been destroyed. Without further records, the mass loss alone does not exclude a spill or specify the evaporation rate over a particular time.