Chemical Reactions Exploration
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Chemical Reactions Exploration
Sort the evidence
Use the evidence cards in Questions 1–4. A physical change changes a substance’s form or state without making a new substance.
A. Iron wool is left damp. Days later, a flaky orange-brown coating appears.
B. An ice cube on the robot workbench melts into a puddle.
C. Hollie mixes two clear solutions. The mixture turns cloudy and a solid settles at the bottom.
D. Ellis stirs sugar into warm water until the crystals are no longer visible.
- Yes: bubbles always prove a new substance formed.
- No: bubbles can also come from boiling, so check for other evidence.
- Yes: any change you can see is a chemical reaction.
Plan a fair test
The club wants to compare how quickly two safe, shop-bought effervescent tablets fizz in water. Use the mini data table and your science knowledge.
Trial
Water temperature
Time until fizzing stops
1
20°C
68 seconds
2
40°C
31 seconds
Explain and apply
Use complete scientific explanations. Remember: observations are what you notice; explanations describe what those observations suggest.
3 printable pages
Page 1
Page 2
Page 3
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