A change in size or shape but no new substance created

A change is a substance that results in the formation of a brand new substance with new properties

The Law of Conservation of Mass says

An Exothermic reaction is

An example of an endothermic reaction would be

Which is NOT evidence of a chemical change

Which of the following is a chemical change

What happens to a substance during a physical change?

Two solutions are added together and the new solution becomes cold. This tells you that

A pot of water is heated over a flame until bubbles form. This is an example of a

Approximately how many elements are known to scientist today

Sodium is an explosive metal and Chlorine is a toxic gas. Why are they safe to eat when they combine to make salt?

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