An experiment with rock salt used three beakers. Each had 100 ml of water and 25 g of salt added. Beaker A was left alone and Beaker B and C were changed. The time needed to dissolve the salt was measured. Which of the following is the best hypo

An experiment with rock salt used three beakers. Each had 100 ml of water and 25 g of salt added. Beaker A was left alone and Beaker B and C were changed. The time needed to dissolve the salt was measured. Which conclusion best sums up this expe

How does a burning fire consume atmospheric oxygen differently than a nail rusting?

An iron nail left outdoors for a year undergoes a chemical change. What evidence would visible? The nail would be

What is the main difference between fire and respiration?

How is rust different from the other three reactions?

An iron nail rusts when left outdoors. Why might the nail no longer be useful?

Color change is evidence that a chemical change may have occurred.

Chemical changes can be reversed by physical changes.

A _____________________ change is a change of matter from one form to another without a change in chemical properties.

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