2.2 Changes in Matter

How is melting different from burning?

• Melting is a physical change, while burning is a chemical change.

• Melting involves a change in temperature, while burning does not.

• Melting requires oxygen, while burning does not.

• Melting produces light, while burning does not.

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NGSS.MS-PS1-5

In Lesson 2, students review and compare:

• different teaching methods

• various historical events

• scientific theories

• literary genres

The law of conservation of mass relates to chemical reactions according to Lesson 2 by stating that:

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

• Mass is created in a chemical reaction.

• Mass is destroyed in a chemical reaction.

• Mass is irrelevant in a chemical reaction.

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A physical change is:

• a change in the chemical composition of a substance

• a change in the physical properties of a substance without altering its chemical structure

• a transformation that results in the formation of a new substance

• a process that involves the breaking and forming of chemical bonds

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A phase change is:

• a change in temperature

• a change in state of matter

• a change in chemical composition

• a change in color

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A chemical change is:

• a change in the state of matter without altering the chemical composition

• a change that involves the formation of new substances with different properties

• a temporary change that can be easily reversed

• a change that does not involve energy exchange

The law of conservation of mass states that:

• Mass can be created or destroyed in a chemical reaction.

• Mass is conserved and cannot be created or destroyed in a chemical reaction.

• Mass can be transformed into energy in a chemical reaction.

• Mass is irrelevant in a chemical reaction.

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What happens to the chemical composition of aluminum foil when it is crumpled into a ball?

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A change that alters a substance without changing its chemical composition is called a ________.

• physical change.

• chemical change.

• nuclear change.

• biological change.

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What does the state of matter of a substance depend on?

• Temperature and pressure of the surroundings

• Color and shape of the substance

• Volume and mass of the substance

• Density and viscosity of the substance

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NGSS.MS-PS1-4