QUESTION
4. Freezing of water is an example of a chemical change. TRUE OR FALSE
5. Increasing the temperature will increase the rate at which physical and chemical change occur. TRUE OR FALSE
ANSWER
4. Freezing of water is an example of a chemical change. FALSE
- When liquid water freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same
5. Increasing the temperature will increase the rate at which physical and chemical change occur. TRUE
- An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.
Hope it helps.
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