1. Question: After a few hours under the sun, salt was found in the petri dish. Explain how salt was found in the petri dish. 2. Topic(s): Heat, States of Matter 3. Key words: hours, salt, explain 4. Answer: Evaporation occurs at any given temperature, thus the water has evaporated after a few hours due to the sun’s heat. Salt cannot be evaporated, hence it is left behind. 5. Tip(s): Student needs to know how evaporation and heat work to answer the question. |
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)