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

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

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

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

Serena mixed two samples together: a gray solid that smells like flowers and a gray solid that smells like bleach. She analyzed the results and found two ending substances. One of the ending substances was a white solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Serena mixed together?

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Santiago is a chemist working to make a new kind of antacid, which is a medicine that helps with stomach pain. He mixed two powdery solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Santiago found two liquid 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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Who had a better description of the sample?

• David

• Luisa

Which substances are the reactants?

• ethanol

• oxygen

• carbon dioxide

• water

Which substances are the products?

• ethanol

• oxygen

• carbon dioxide

• water

the tiny pieces that all matter—all the stuff in the world—is made of

• atoms
• planets
• cells
• molecules

a process in which atoms rearrange to form new substances

• chemical reaction
• physical reaction
• biological reaction
• nuclear reaction

a group of atoms joined together in a particular way

• molecule
• cell
• organism
• rock

something that can be observed about a substance, such as color, smell, or boiling point

• physical property
• metaphysical property
• spiritual property
• emotional property