What must often be added to increase the speed or ability of 2 substances to react?

Which physical change does a swamp cooler use to cool the air?

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

Toni & Juan decide to do an experiment where one will drop food coloring into hot water; the other will do the same in cold water. Based on your knowledge of energy, predict the results

How does adding heat affect liquid water?

Which of the following is an example of how understanding chemical change helps people?

What does liquid water need to change into water vapor?

The boiling point of water at sea level is 100 degrees Celsius. What phase would you expect water to be in if it were heated to 110 degrees Celsius?

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

As warm air rises, it cools, condenses and freezes in the upper atmosphere. What happens as it falls back to Earth?

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