Unit 3 Properties of Matter Revisit

The subatomic particles of an atom stay the same during a chemical change.

• true

• false

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NGSS.MS-PS1-5

pH levels rise when there is a chemical reaction

• true

• false

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Atoms form new molecules or compounds during a chemical reaction.

• true

• false

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The new substance is formed with different physical properties during a chemical reaction.

• true

• false

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NGSS.MS-PS1-2

Heat is always released during a chemical reaction.

• true

• false

Water always dissolves other substances during a chemical reaction.

• true

• false

Organize these options into the right categories

Groups:

(a) Element

,

(b) Compound

,

(c) Mixture

• Blood

• Milk

• Hydrogen

• Carbon Dioxide

• Chlorine

• Salt

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NGSS.MS-PS1-1

The structure, properties, and transformations of matter can all be explained by—

• The gravity of the closest star

• Attraction and repulsion of electric charges.

• Newton’s first law of motion

• The polarity of water molecules that allows them to form hydrogen bonds

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NGSS.MS-PS1-1

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Which are true conclusions that could be drawn based upon this diagram? Select two.

• Salt and water are chemically bonded and therefore can only be separated through heat.

• Adding salt to roads before snow storms can prevent ice from forming.

• Salt elevates the freezing point of water and is therefore dangerous to use on roadways before a predicted ice storm.

• Salt molecules are heavier than water molecules and therefore will float to the bottom of any mixture.

• The freezing point of NaCl (salt) is somewhere between 0℃ and -15℃.

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NGSS.MS-PS3-4

A student conducts an experiment in which 20mL and 2 L of water are both heated until they begin to boil. A digital thermometer is placed into both liquids. Once the water reaches the boiling point. Which of the following will the student observe?

• The 20mL will boil at a lower temperature than the 2L.

• The 2L will boil at a lower temperature than 20mL.

• The 2L will turn to gas but the 20mL will go from liquid to plasma.

• The 20mL and the 2L will boil at the same temperature.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5