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

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?

Salt is mixed with water and stirred. Is this a physical or chemical change? Why?

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

Two students mix vinegar and baking soda. They observe bubbles forming, the baking soda dissolving, and the vinegar turning cloudy. They infer that a chemical change has occurred. Which data support this inference?

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 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

What hazards exist when mixing unknown chemicals?

Is burning wood a chemical or a physical change?

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