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States of Matter and Particle Theory — Free MYP2 Sciences Practice Questions
1QuestionApplications of Particle Theory in Real LifeConcept Practice
3 marks~5 minCriterion A
A metal rail is 10.000 m long at 0°C. When heated to 100°C, its length increases to 10.012 m.
a
State what happens to the particles in a solid when it is heated. [1]
b
Explain, using particle theory, why the rail becomes longer when heated. [1]
c
The rail expands by 0.012 m over 100°C. A steel bridge beam expands by 0.060 m over the same temperature rise. Compare the expansion of the two metals and suggest one reason for the difference. [1]
Solutions
2QuestionApplications of Particle Theory in Real LifeAssessment Practice
2 marks~3 minCriterion D
A student sprays deodorant on one side of a classroom. A few minutes later, students on the opposite side can smell it.
a
Describe how particle theory explains why the smell spreads across the room. [1]
b
State one limitation of the particle model in explaining this observation. [1]
Solutions
3QuestionApplications of Particle Theory in Real LifeAssessment Practice
5 marks~8 minCriterion C
A student seals the tip of a syringe at the 20 mL mark, then pushes the plunger to the 10 mL mark. They feel resistance and say: "The air particles are being compressed, so they become smaller, making it harder to push."
a
Identify the error in the student's claim about air particles. [1]
b
Explain, using particle theory, why the air particles create more resistance as the plunger moves from 20 mL to 10 mL. [2]
c
Compare the student's explanation with the correct scientific explanation. State one way they are similar and one way they differ. [2]
Solutions
4QuestionSolids Liquids and Gases Basic PropertiesAssessment Practice
6 marks~9 minCriterion B
A student traps of air in a syringe at . She heats the syringe and records the volume at each temperature.
| Temperature () | 20 | 40 | 60 |
|---|---|---|---|
| Volume (mL) | 20.0 | 21.4 | 22.8 |
a
Identify the pattern in the data. [1]
b
Calculate the predicted volume of air at . Show your working. [2]
c
Explain, using particle theory, why heating the air causes its volume to increase. [3]
Solutions
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