Quiz - Chemical Reaction

A starting substance that is part of a chemical reaction?

• Reactant

• Product

• Substance

• Properties

An ending substance that is made during a chemical reaction

• Product

• Reactant

• Substance

• Properties

Something that is made of all the same atoms or groups of atoms

• Substance

• Product

• Reactant

• Properties

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

• Property

• Substance

• Reactant

• Candy

Atoms just get re-arrange they never get destroyed or created

• True

• False

The tiny pieces that all matter (all the stuff in the world) is made of. Example: Oxygen is an atom.

• Atoms

• Properties

• Substances

• Lollipop

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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A chemist mixed two samples together: a brown solid that melts at about 1,300°C and a colorless liquid that melts at about 20°C. She analyzed the results and found two ending substances. One of the ending substances melts at about 250°C. 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 chemist mixed together?

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Which of the following is true about chemical reactions?

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Substances have different properties because they are made up of different groups of atoms.

• TRUE

• FALSE