Chemical vs Physical Changes Khan Academy

What is the primary characteristic that distinguishes a chemical change from a physical change?

• A change in the state of matter

• The formation of a new substance

• A change in the shape or size of the substance

• The substance remains the same, but its appearance changes

Which of the following is an example of a chemical change?

• Melting ice into water

• Breaking an iron chain

• Burning wood into ash

• Dissolving sugar in water

Which of the following describes a chemical property?

• The color of a substance

• The ability of a substance to rust

• The density of a substance

• The melting point of a substance

Which of these is a common sign that a chemical change has occurred?

• A change in shape

• A change in volume

• A change in odor

• A change in texture

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