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Physical and Chemical Changes — Free MYP1 Sciences Practice Questions
1QuestionExamples of Reversible and Irreversible ChangesConcept Practice
2 marks~3 minCriterion D
Ice can melt into water and then be frozen back into ice again.
a
Give one example from everyday life where the change between ice and water is useful. [1]
b
Describe why it is helpful that this change can happen again and again. [1]
Solutions
2QuestionDefinition and Comparison of Physical and Chemical ChangesConcept Practice
4 marks~6 minCriterion A
Look at the two scenarios below.
Scenario 1: An ice cube is left on a table and melts into a puddle of water.
Scenario 2: A piece of paper is set on fire and burns, leaving behind ash and smoke.
Scenario 1: An ice cube is left on a table and melts into a puddle of water.
Scenario 2: A piece of paper is set on fire and burns, leaving behind ash and smoke.
a
Identify which scenario shows a physical change and which shows a chemical change. [2]
b
Describe one reason why Scenario 1 is a physical change. [1]
c
Describe one way in which Scenario 2 is different from Scenario 1 that shows it is a chemical change. [1]
Solutions
3QuestionInvestigating Changes in the LabConcept Practice
3 marks~5 minCriterion C
Students mixed baking soda with vinegar in a beaker and noticed three things:
1. Fizzing and gas bubbles appeared.
2. The mixture felt slightly cooler.
3. A white solid was left at the bottom.
1. Fizzing and gas bubbles appeared.
2. The mixture felt slightly cooler.
3. A white solid was left at the bottom.
a
Identify one observation from the list above that shows a chemical change occurred. [1]
b
Describe why that observation is evidence of a chemical change. [1]
c
Explain why the temperature drop (Observation 2) alone is not enough to prove a chemical change happened. [1]
Solutions
4QuestionDefinition and Comparison of Physical and Chemical ChangesConcept Practice
3 marks~5 minCriterion B
The table below shows four everyday changes.
Change — New substance formed? — Can it be reversed?
Change — New substance formed? — Can it be reversed?
| Ice melting | No | Yes |
|---|---|---|
| Toast burning | Yes | No |
| Sugar dissolving in water | No | Yes |
| Iron rusting | Yes | No |
a
Identify one change from the table that is a physical change. [1]
b
Describe the pattern in the table that shows whether a change is a physical change or a chemical change. [1]
c
Compare ice melting and iron rusting using the data in the table. [1]
Solutions
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