Characteristics of Chemical Reactions

The chart below shows the results of combining various substances.

(See attached table)

Which of the following statements is true?

• We know combining Substances A and B resulted in a chemical reaction because a gas was formed.

• We know combining Substances C and D resulted in a chemical reaction because of the lack of a temperature change.

• We know combining Substances A and B resulted in a chemical reaction because of the lack of a temperature change.

• We know that neither combinations resulted in a chemical reaction because neither one had a color change.

Tags

NGSS.MS-PS1-2

Which of the following is the best description of the results of a chemical reaction?

• A new substance with different properties is formed.

• The substance seems to disappear after dissolving in water.

• The substance changes from liquid to solid at a low temperature.

• The reaction can be reversed to get back the original substance.

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NGSS.MS-PS1-2

Two clear chemicals combine. The solution turns yellow and gets cold. What evidence suggests that a chemical change took place?

• There is no evidence.

• The solution turned yellow.

• The solution got cold.

• The solution both turned yellow and got cold.

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NGSS.MS-PS1-2

A substance that takes part in and undergoes change during a reaction

• Properties

• Reactant

• Atom

• Chemical reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A copper penny turning greenish after a few years is an example of ...

• Chemical Change

• Physical Change

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NGSS.MS-PS1-2

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sodium and chlorine react to form salt. How do we know a chemical reaction has taken place at the atomic level?

• Both substances have a positive charge.

• Sodium and chlorine regroup to form a new molecule.

• One of the atoms is bigger than the other.

• Chlorine is a gas and sodium is a solid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The process by which one or more substances change to produce one or more different substances

• Chemical process

• Chemical reaction

• Properties

• Reactant

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT an indicator (evidence) of a chemical reaction?

• Precipitate formation

• Light being produced

• Change in state of matter

• Change in temperature

Tags

NGSS.MS-PS1-2

How are fireworks an example of chemical reactions?

• The chemicals do not change as they explode.

• They are made of chemicals.

• Heat, light, and sound are given off.

• Fireworks are not examples of chemical reactions.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5