A balloon is placed in a freezer and left overnight. Which would be evidence that a physical change occurred when the freezer was opened the next day? The balloon

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

What hazards exist when mixing unknown chemicals?

. A student puts out fire on the stove by dumping baking soda on the flame. How has the student used scientific knowledge in his daily life?

How do you know when a chemical reaction has occurred?

Scientists have developed special paints for the undersides of ships at sea. What problem are they trying to correct?

Charles Goodyear accidentally spilled sulfur on latex rubber and discovered a way to make the rubber more elastic. What does his discovery show about science?

A chemical change occurs when an egg cooks. What effect does the chemical change have on the physical properties of the egg?

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

Which of the following is true of chemical properties? They

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