1.2 Chemical Changes

Question 1

This table shows experiments done by five scientists.ScientistExperimentKylecut a bar of gold in halfKatieburned paper into ashGracereacted acid and limestone together, forming carbon dioxideIsaacmelted solid aluminum, forming liquid aluminumCalebadded oxygen to metal, forming rust

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C: Katie, Grace, Caleb,

Question 2

Wood is a substance that burns in the presence of oxygen. Which best describes this property of wood?

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B: combustible

Question 3

Which statement describes one feature of chemical changes?

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B: They change a substance’s identity.

Question 4

When Gerald mixes baking soda and vinegar, the materials combine to turn into a gas. What can Gerald assume occurred?

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A: a chemical change

Question 5

A chemist mixes oxygen gas and hydrogen gas to form water, which is composed of one oxygen and two hydrogen atoms per molecule. What has occurred?

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A: a chemical change

Question 6

Which scenario best describes a chemical change?

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C: copper corroding in the presence of oxygen

Question 7

The mixing of barium chloride and sodium sulfate is a precipitate reaction. This reaction generates barium sulfide and sodium chloride.

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D: Barium chloride and sodium sulfate are liquids, and barium sulfide or sodium chloride must be a solid.

Question 8

Indicators change color when an acid and a base are mixed together. The change in color most likely indicates that

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A: a chemical change has occured.

Question 9

Which statement best describes most chemical changes?

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D: They are not reversible.

Question 10

In the reaction 2Na + Cl2 → 2NaCl, the products are

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D: different from the reactants.

1.2 Chemical Changes Answers

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