Quiz: Understanding Physical and Chemical Changes

Which of the following best describes a physical change?

• A) A change that alters the chemical composition of a substance.

• B) A change that affects the form or appearance but not the chemical structure.

• C) A change that produces heat and light.

• D) A change that creates a new substance.

What happens to the molecules of water when ice melts?

• They change into hydrogen and oxygen.

• They remain H2O but change from solid to liquid.

• They disappear completely.

• They become a gas.

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NGSS.MS-PS1-4

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Which of the following is NOT an example of a physical change?

• Cutting a sheet of paper.

• Melting wax.

• Baking a cake.

• Molding clay.

When a salad is made by cutting and mixing vegetables, what type of change occurs?

• A) Chemical change

• B) Physical change

• C) Both physical and chemical change

• D) No change at all

What is a key indicator of a chemical change?

• Change in size

• Change in color, production of gas, or formation of a precipitate

• Change in shape

• Change in temperature

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NGSS.MS-PS1-2

Why is rusting of iron considered a chemical change?

• It changes shape.

• It creates a new substance, rust, with different properties.

• It only changes color.

• It involves the melting of iron.

Tags

NGSS.MS-PS1-2

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What occurs during the baking of a cake that signifies a chemical change?

• The ingredients simply mix together.

• New compounds are formed, changing the taste and texture.

• The cake remains the same throughout.

• The cake becomes cold.

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NGSS.MS-PS1-2

In the reaction between baking soda and vinegar, what is produced that indicates a chemical change?

• Solid pieces

• Carbon dioxide gas

• Water only

• A new type of vinegar

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NGSS.MS-PS1-2

Why is tearing lettuce for a salad considered a physical change?

• The lettuce changes into a different vegetable.

• The lettuce retains its chemical composition.

• The lettuce becomes inedible.

• The lettuce changes color.

Which of the following is an example of a physical change involving temperature?

• Ice melting when heated

• Bread baking in an oven

• Iron rusting

• A candle burning

Tags

NGSS.MS-PS1-4