Chemical Reactions: Chapter 3

Devorah is a food chemist, and she is developing a chemical to help foods stay fresh longer. She mixed a red liquid substance and a colorless solid substance together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Devorah found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

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NGSS.MS-PS1-1

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Paula works at a paint company and is developing new ingredients to make paint safer to use. She mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Paula found two yellow substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

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NGSS.MS-PS1-1

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A company that makes frying pans needs to create a new substance to coat the pans. The substance must have a high melting point. To create this new substance, workers mixed together two substances that melt at low temperatures in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, the workers found two substances that melt at higher temperatures in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

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NGSS.MS-PS1-1

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If 25 grams of sugar dissolves into 150 grams of water, what is the new weight of the liquid?

• 125 g
• 150 g
• 25 g
• 175 g

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As this candle burns it gets shorter. Where does the wax go?

• wax goes into the air
• disappears
• melts into the candle
• burns and releases gases into the air

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A substance that is at the beginning of a chemical reaction...

• coefficient

• subscript

• reactant

• product

a new substance or substances formed in a chemical reaction

• coefficient

• subscript

• reactant

• product

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NGSS.MS-PS1-2

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If you add chlorine to a container and get the following products, was the container empty or did it have another substance in it?

• Empty. The Chlorine turned into Sulfur and Hydrogen Chloride

• It was not empty. There must have been something in the container that reacted with the Chlorine to form Sulfur and Hydrogen Chloride.

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What as the other reactant in this chemical reaction?

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The diagram above shows the repeating groups of atoms that make up two samples. Both samples are green gases at room temperature. Will the other properties of the two samples be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The other properties will be the same because the repeating groups of atoms that make up the two samples are the same.

• The other properties will be different because there are more repeating groups of atoms in Sample 2.

• The other properties will be the same because both samples are green at room temperature.

• The other properties will be the same because both samples are gases at room temperature.

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NGSS.MS-PS1-1

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