What often happens when a chemical or physical change occurs?

What must often be added to increase the speed or ability of two substances to react?

What kinds of energy are produced by bright fireworks?

Which of these is an example of energy involved in a chemical change?

How does adding heat affect liquid water?

What does liquid water need to change into water vapor?

What would you be expecting water to do at 100C?

An exothermic reaction:

When lighting a match, why must it be drawn rapidly along a rough surface?

What energy is required in order for photosynthesis to occur?

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