Physical and Chemical Changes

Henry, Anika, and Arjun were discussing in their science class. Henry said that melting ice into water is a type of change that can be easily reversed. What type of change is he referring to?

• chemical change

• physical change

• both chemical and physical changes

• neither physical or chemical changes

Tags

NGSS.MS-PS1-2

Which of the following are CHEMICAL changes?

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Rohan is learning about chemical changes in his science class. His teacher gave him a list of activities and asked him to identify which one is NOT a chemical change. Can you help Rohan?

• Steven making pancakes for breakfast

• Abigail dissolving sugar into her morning tea

• Rohan's mom baking a cake for his birthday

• An apple rotting in Rohan's backyard

Tags

NGSS.MS-PS1-2

Luna, Oliver, and Abigail are in a science class. They are studying a sample of a liquid. They observe that the liquid is blue and bubbly. They combine the sample with vinegar. The color of the liquid changed and it stopped bubbling. Based on this information, which of the following is a correct conclusion?

• The sample liquid did not change.

• The sample liquid has chemically changed.

• The sample liquid has physically changed.

Answer explanation

Chemical changes create new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Determine whether a Physical Change or Chemical Change has occurred.

Groups:

(a) Physical Change

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(b) Chemical Change

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• Changes in the State of Matter

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• A new substance is created

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Match the vocabulary word to the correct definition.

• Mixture

• A permanent change that cannot be reversed and results in a creation of a new substance.

• Physical Property

• A change that is easily reversed and does not result in a new substance being created.

• Chemical Change

• Properties that can be measured only by chemically changing an object.

• Physical Change

• Properties that are measurable and can be seen (ex. Color, hardness, area, length, strength,

  and temperature)

• Chemical Property

• Something that contains two or more substances that are not combined chemically.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Match the vocabulary word with the correct definition.

• Gas

• Anything that has mass and takes up space. It cannot be created nor destroyed.

• Liquid

• The state of matter that has no definite shape and take the shape of their container. (ex. water vapor)

• Matter

• The state of matter that has a definite

  shape and volume. Their shape and volume cannot be easily changed. (ex. ice)

• Solid

• The state of

  matter that has a definite volume but no fixed shape (ex. water)

• States of Matter

• The different forms in which matter can be found

Tags

NGSS.MS-PS1-4

During a science fair, Aiden presented a reaction where baking soda reacts with vinegar to produce carbon dioxide gas. What kind of change does this reaction represent?

• Physical change

• Chemical change

• State change

• Reversible change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mrs. Seals' class is doing their science classwork and needs to classify the process of water boiling into steam.

Sophia determines boiling water is a chemical change because boiling water creates steam, which is a new substance. Landon disagrees with Sophia and says boiling water is a physical change because it is a change in the state of matter.

Who is correct and why?

• Sophia is correct because the change is creating a new substance.

• Landon is correct because a change in the state of matter is always a physical change.

• Sophia is correct because by creating steam, the change is irreversible.

• Landon is correct because a change in the state of matter occurred, but is a chemical change.

• Neither Sophia or Landon are correct because water cannot undergo a physical or chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

In their science class, Mia and Noah are discussing the process of rusting iron. Mia believes that rusting is a physical change because the iron changes its appearance. Noah, however, argues that rusting is a chemical change because a new substance, rust, is formed. Who is correct and why?

• Mia is correct because the change in appearance indicates a physical change.

• Noah is correct because the formation of a new substance indicates a chemical change.

• Mia is correct because rusting can be reversed, indicating a physical change.

• Noah is correct because rusting cannot be reversed, indicating a chemical change.

• Both Mia and Noah are incorrect because rusting is neither a physical nor a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5