Properties of Matter in Chemical Reactions

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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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

Which is an example of chemical change?

• Burning paper

• melting wax

• freezing water

• dissolving salt into water

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Which is an example of a chemical change?

• Dew disappearing from the grass.

• Frying a hamburger.

• bending a pop can

• milk evaporating

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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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A comustion reaction occurs between one molecule of methan (CH4) and two molecules of oxygen (O2). How many atoms of carbon, hydrogen, and oxygen make up the products for this combustion reaction?

• 1 carbon, 4 hydrogen, and 2 oxygen

• 1 carbon, 4 hydrogen, and 4 oxygen

• 1 carbon, 1 hydrogen and 2 oxygen

• 2 carbon, 4 hydrogen, and 1 oxygen

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Which of the following is evidence that a chemical change occurred?

• a change of color

• gas is produced

• a log decomposes

• all of the above

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NGSS.MS-PS1-2

What do we call substances that are before chemical reactions?

• reactants

• products

• equations

• solids

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