Which of the following examples shows that a chemical reaction has occurred?

Rust forms on a hammer that has been left outside to long.

A rock breaks into smaller pieces when it is struck with a hammer.

A cup of water turns pink when a few drops of red food coloring are added.

A solid is formed when heat is removed from a sample of water.

A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -

could show that a gas is forming

always rise to the top of a liquid.

are almost always perfectly spherical.

usually burst after a few minutes.

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

A yellow solid forms and then settles to the bottom of the beaker.

The level of the substance in the beaker is higher after the other liquid is added.

Small white crystals are left behind in the flask that held the first liquid.

Which of the following is an example that includes evidence of a chemical reaction?

Sugar that is burned gives off an odor and turns brown and then black.

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

A tomato is placed into a blender and chopped up into smaller pieces.

For an investigation a student poured a blue solution of CuSO 4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence supports this inference?

A dark solid formed on the zinc metal.

The zinc metal remained silver-colored and shiny

The CuSO 4 solution turned blue when the zinc metal was added.

Recognizing Chemical Reactions

Authored by Charles Martinez

Science

9th - 12th Grade

NGSS covered

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25 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Synthesis (aka "Combination" Reaction

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Combustion Reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

NaCl is a ...

acid

base

salt

water

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Synthesis (aka "Combination" Reaction

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Combustion Reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Synthesis (aka "Combination" Reaction

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Combustion Reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Synthesis (aka "Combination" Reaction

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Combustion Reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a ____ reaction, an acid and a base produce a salt and a water.

concentrated

decomposition

dilute

neutralization

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Synthesis (aka "Combination" Reaction

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Combustion Reaction

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Recognizing Chemical Reactions

NaCl is a ...

In a ____ reaction, an acid and a base produce a salt and a water.

A neutralization reaction will (almost) always produce...

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