Chemical Reactions

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1. 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.)

• a The properties will likely be different because there are more repeating groups of atoms in Sample 2.
• b The properties will likely be different because the repeating groups of atoms that make up each sample are different.
• c 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.
• d The properties will likely be the same because the repeating group

2. A scientist mixed two samples together: a colorless liquid that melts at 12°C and a yellow solid that melts at 390°C. She analyzed the results and found two ending substances. One of the ending substances was a gray 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 the scientist mixed together?

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