Unit 1: Chemical Reaction Review

Which is the best evidence that a chemical change has occurred?

• Change of state

• Release of energy

• Temperature change

• Formation of a new substance

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NGSS.MS-PS1-2

The diagram for the structural formula of ethanol shows the elements and their arrangements. What does the circled part of the diagram represent?

• An atom

• Any ion

• One molecule

• An electron

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NGSS.MS-PS1-1

Ozone is three oxygen atoms bonded together. It can sometimes be smelled in the air after a thunderstorm. The smell is a result of

• Pollution

• Condensation

• A chemical change

• A physical change

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

• Moleules

• Elements

• Gasses

• Solids

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NGSS.MS-PS1-1

Louis was investigating physical and chemical changes in matter. Which of these changes that Louise found involves a chemical change in matter?

• Evaporation of water

• Grinding of a rock

• Melting of ice

• Rusting of a nail

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The diagram represents the chemical reaction that occurs when propane combusts. In the reaction, for every molecule of propane, how many molecules of oxygen are used?

• 1

• 3

• 4

• 5

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The image shows two processes. Which statement best compares the processes?

• They both form a new atom.

• They both form a new molecule.

• Process 1 forms a new molecule, and process 2 forms a new atom.

• Process 1 forms a new atom, and process 2 forms a new molecule.

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of the following best describes two atoms of oxygen that are chemically bonded to each other?

• Molecule

• Compound

• Solution

• Mixture

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NGSS.MS-PS1-1

What number and types of atoms occur in a formula unit of Ca(NO₃)₂?

• 1 carbon, 1 neon, 6 oxygen

• 1 calcium, 2 neon, 3 oxygen

• 1 carbon, 1 nitrogen, 3 oxygen

• 1 calcium, 2 nitrogen, 6 oxygen

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NGSS.MS-PS1-1

Which is a compound?

• Nitrogen (N₂)

• Neon (Ne)

• Ozone (O₃)

• Ammonia (NH₃)

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NGSS.MS-PS1-1