Physical Science: Chapter 19: Chemical Reactions

T / F

1) Atoms rearranging into new molecules is a chemical change.

2) Water freezing from liquid water into ice is also a chemical change.

• 1: T

  2: F

• 1: T

  2: T

• 1: F

  2: T

• 1: F

  2: F

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Balancing equations is based on the principle:

• matter is not created or destroyed in a chemical reaction

• every single bond remains single, every double bond remains double, every triple bond remains triple

• every atom must be bonded to a new, different element

• molecules only grow in size with chemical reactions

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3 NO --> N₂O + NO₂

Is this chemical equation balanced?

• Yes

• No

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SiO₂ + 4 HF --> SiF₄ + 2 H₂O

Is this chemical equation balanced?

• Yes

• No

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2 Fe + O₂ --> Fe₂O₃

Is this chemical equation balanced?

• Yes

• No

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H₂ + O₂ --> H₂O

Is this chemical equation balanced?

• Yes

• No

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4 NH₃ + 5 O₂ --> 4 NO + 6 H₂O

Is this chemical equation balanced?

• Yes

• No

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Match up five (of the six) types of chemical reactions:

• Combustion

• A + O₂ --> AO

• Decomposition

• A + B --> AB

• Double Replacement

• AB --> A + B

• Single Replacement

• AB + XY --> AX + BY

• Synthesis

• A + BX --> B + AX

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NGSS.MS-PS1-5

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Match up four (of the six) types of chemical reactions:

• Double Replacement

• HA + BOH --> H₂O + AB

• Single Replacement

• A + O₂ --> AO

• Combustion

• AB + XY --> AX + BY

• Acid/Base

• A + BX --> B + AX

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2 Al + 3 CuSO₄ --> 3 Cu + Al₂(SO₄)₃

• Synthesis

• Single Replacement

• Combustion

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