Properties of Matter and Chemical Reactions

Matter is anything that has (a)   and takes up space.

What is mass?

• Mass tells us how much space something takes up.

• Mass is a measurement of the amount of matter.

• Mass is a measurement that increases when temperature increases.

• Mass is the same as size.

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NGSS.MS-PS1-5

A solid candy bar has a mass of 18 grams. A student melted the candy bar until it became a liquid. What is the mass of the candy bar as a liquid?

• 9 grams because the mass of a substance reduces by half during a phase change.

• 16 grams because a liquid has a slightly lower mass than a solid.

• 20 grams because a liquid has a slightly higher mass than a solid.

• 18 grams because the total mass of matter remains the same during a phase change.

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NGSS.MS-PS3-4

1.     Matter can change through both physical and chemical changes.  What is always true about matter, even after it changes its form? 

•   The matter releases heat energy.

•   Some of the matter is destroyed

•   New matter is created.

• The amount of matter is the same.

Tags

NGSS.MS-PS1-5

Which is a statement of the law of conservation of mass?

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

• The total mass before a chemical reacteion is the same as the total mass after the reaction.

• Every reaction creates an equal amount of mass related to the amount of energy required for the reaction.

• The total amount of mass is equal to the volume of both chemicals in the reaction

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NGSS.MS-PS1-5

Which is an example of a chemical reaction?

• Lighting a match

• Dissolving salt into water.

• evaporating milk

• melting wax

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NGSS.MS-PS1-5

Two signs a chemical change has occurred are______.

• water evaporating and color change

• bubbles forming and temperature change

• breaking glass and icicles forming on the roof

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NGSS.MS-PS1-2

When a substance undergoes a chemical change its identity does not change.

• True

• False

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NGSS.MS-PS1-2

NGSS.MS-PS1-1

Which is an example of chemical change?

• Burning paper

• melting wax

• freezing water

• dissolving salt into water

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NGSS.MS-PS1-2

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The students are asked to draw a model of chemical reaction between two substances. A student uses a black circle to represent one kind of atom and a white circle to represent another kind of atom. Which model shows that a chemical reaction takes place and that mass is conserved?

• 
• 

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NGSS.MS-PS1-5