Chemical Reactions Study Guide Part 2

These 2 samples are made of molecules of different elements. What statement below best describes the properties of these 2 samples?

(Examples of properties are smell, color, and the temperature at which a substance melts.)

• These samples have the same properties because they both are made of molecules that have 3 atoms each.

• The samples have different properties because sample 2 has more molecules than sample 1.

• The samples have different properties because the molecules in each sample are made of at least one different atom.

• The samples have the same properties because they both have one atom in common in all molecules.

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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, shown in the diagram. This ending substance is made up of the repeating group of atoms shown above. Another unknown substance was made, not shown here. 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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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 1.

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

• 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.

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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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Marisol mixed two samples together: a brown liquid with no smell and a colorless gas that smells irritating. She

analyzed the results and found two ending substances. One of the ending substances smelled sweet. 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 Marisol mixed together?

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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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Patrick works at a company that makes paper and needs a chemical to make the paper brighter. He 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, Patrick 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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Open Response Question: Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not

look the same as the starting substances. Sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. He created a model of the repeating groups of atoms that

might make up the two ending substances.

Does his model correctly show why the properties of the ending substances are different from the properties of the starting substances? Describe what could be correct or incorrect about his model.

Choose all correct answers.

• No, there are a different number of atoms on each side of the chemical reaction. Atoms can not be created or destroyed in a chemical reaction.

• No, because the red solid and the colorless gas of the reactants changed into a white solid and colorless liquid in the products.

• Yes, the types of atoms on the reactant side can be found on the product side of the chemical reaction.

• No, the some of the types of atoms on the reactants side are the same as the types of atoms on the products side but there is one type of atom on the reactant side that is not found on the product side.

• Yes, because odor changes during a chemical reaction.

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