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Observe and Record Changes Practice Test
•8 QuestionsQuestion
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Q1
The data table shows Amir’s temperature measurements when he mixed substances (no hot or cold water was added).
Mixture Start temp Temp after 1 minute Other observations Water + salt 22°C 22°C Salt dissolved, no bubbles Vinegar + baking soda 22°C 18°C Lots of bubbles, fizzing Water + sand 22°C 22°C Sand settled, water cloudy then clearer
Based on the observations, which mixture shows evidence of a chemical change?
The data table shows Amir’s temperature measurements when he mixed substances (no hot or cold water was added).
| Mixture | Start temp | Temp after 1 minute | Other observations |
|---|---|---|---|
| Water + salt | 22°C | 22°C | Salt dissolved, no bubbles |
| Vinegar + baking soda | 22°C | 18°C | Lots of bubbles, fizzing |
| Water + sand | 22°C | 22°C | Sand settled, water cloudy then clearer |
Based on the observations, which mixture shows evidence of a chemical change?