Understanding Chemical and Physical Changes

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

• Burning wood

• Dissolving salt in water

• Rusting of iron

• Milk souring

What is the Law of Conservation of Mass?

• Mass is neither created nor destroyed in a chemical reaction.

• Mass increases in a chemical reaction.

• Mass decreases in a chemical reaction.

• Mass can be created during a physical change.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a chemical change?

• Boiling water

• Freezing water

• Decomposing water into hydrogen and oxygen

• Melting ice

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• 2

• 4

• 6

• 8

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• Decomposition

• Synthesis

• Single replacement

• Double replacement

Which of the following is NOT a type of chemical reaction?

• Synthesis

• Decomposition

• Filtration

• Single replacement

When ice melts into water, what type of change occurs?

• Chemical change

• Physical change

• Both a chemical and physical change

• Neither a chemical nor physical change

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

In a balanced chemical equation, why must the number of atoms of each element be the same on both sides of the equation?

• To satisfy the Law of Conservation of Mass

• To make the equation easier to read

• To increase the reaction rate

• To decrease the energy required for the reaction

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NGSS.MS-PS1-5

What happens to the atoms in a chemical reaction?

• They are destroyed.

• They are created.

• They are rearranged to form new substances.

• They remain unchanged.

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Which of the following cheimcal equations has a total of 24 atoms?

• 2H₃PO₄

• 2Fe(OH)₃

• C₆H₁₂O₆

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NGSS.MS-PS1-1