Quiz about Recognizing Chemical Reactions

Question 1

$$P+O_2\ →P_4O_{10}$$ is an example of what type of chemical reaction?

Accepted Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 2

NaCl is a ...

Accepted Answer

salt

Answer

acid

Answer

base

Answer

water

Question 3

$$HgO→Hg+O_2$$ is an example of what type of chemical reaction?

Accepted Answer

Decomposition Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 4

$$Cl_2+NaBr→NaCl+Br_2$$ is an example of what type of chemical reaction?

Accepted Answer

Single Replacement Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 5

$$Na+Br_2→NaBr$$ is an example of what type of chemical reaction?

Accepted Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 6

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

Accepted Answer

neutralization

Answer

concentrated

Answer

decomposition

Answer

dilute

Question 7

$$HgO+Cl_2→HgCl+O_2$$ is an example of what type of chemical reaction?

Accepted Answer

Single Replacement Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 8

$$KClO_3→KCl+O_2$$ is an example of what type of chemical reaction?

Accepted Answer

Decomposition Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Answer

Combustion Reaction

Question 9

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

Accepted Answer

water & salt

Answer

water

Answer

salt

Answer

water & carbon

Question 10

$$BaCl_2+Na_2SO_4→NaCl+BaSO_4$$ is an example of what type of chemical reaction?

Accepted Answer

Double Replacement Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Combustion Reaction

Question 11

$$CH_4+O_2→CO_2+H_2O$$ is an example of what type of chemical reaction?

Accepted Answer

Combustion Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Question 12

Forms hydroxide ions (OH^-) in water

Accepted Answer

Bases

Answer

Acids

Answer

All

Question 13

$$CuCl_2+H_2S→CuS+HCl$$ is an example of what type of chemical reaction?

Accepted Answer

Double Replacement Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Combustion Reaction

Question 14

$$O_2+C_{10}H_8→H_2O+CO_2$$ is an example of what type of chemical reaction?

Accepted Answer

Combustion Reaction

Answer

Synthesis (aka "Combination" Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Double Replacement Reaction

Question 15

Complete the following reaction:

HCl + Mg(OH)₂ -->

Accepted Answer

MgCl₂ + H₂O

Answer

Mg +H2O

Answer

MgCl₂ + H₂

Answer

MgCl₂ + H₂O + CO₂

Question 16

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 17

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 -

Accepted Answer

could show that a gas is forming

Answer

always rise to the top of a liquid.

Answer

are almost always perfectly spherical.

Answer

usually burst after a few minutes.

Question 18

Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?

Accepted Answer

Experiment 1

Answer

Experiment 2

Answer

Experiment 3

Answer

Experiment 4

Question 19

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?

Accepted Answer

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

Answer

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

Answer

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

Question 20

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 21

For an investigation a student poured a blue solution of CuSO₄ 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?

Accepted Answer

A dark solid formed on the zinc metal.

Answer

The zinc metal remained silver-colored and shiny

Answer

The CuSO₄solution turned blue when the zinc metal was added.

Answer

None of these

Question 22

Which of the following equations demonstrates an actual chemical reaction that forms a new substance?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 23

A compound X on reaction with a test tube of copper (II) oxide produced a blue coloured solution, releasing a colourless gas which puts out a burning splint with a pop sound. Identify the compound:

Accepted Answer

acid

Answer

salt

Answer

base

Answer

alkali

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