An ice cube is left on a table for an hour. What evidence shows a physical change takes place?

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

Three chemicals are mixed together and the resulting mixture is a different color. What is this evidence of?

Which of the following is an example of chemical change?

Salt is added to water and dissolves. This is evidence of:

Two chemicals are combined and bubbles form. What is the state of the product?

Which of the following is not a chemical change?

A balloon is placed in a freezer. What is the evidence a physical change has occurred?

How do you know when a chemical reaction has occurred?

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

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