Lesson 2.2 Vocab: Chemical and Physical Changes

a change in size, shape, form or state of matter

(a)  

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a change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties.

(a)  

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the ability or inability of a substance to combine with or change into one or more new substances.

(a)  

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law that states that the total mass of the substances before a chemical change is the same as the total mass of the substances after the chemical change.

(a)  

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the result of the motion of all the particles, and the distance and attractions between those particles in the system.

(a)  

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a solid that sometimes forms when two liquid solutions combine.

(a)  

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Which of the following are CHEMICAL changes?

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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

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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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• A new substance is created

• Changes in the State of Matter

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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.

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