Quiz about Chemical Reactions

Question 1

Which type of chemical reaction is shown?

Accepted Answer

decomposition

Answer

double replacement

Answer

composition

Answer

combustion

Question 2

Which type of reaction can be recognized by the general pattern?

Accepted Answer

single replacement

Answer

combustion

Answer

composition

Answer

decomposition

Question 3

What is the correct ratio of coefficients to balance this chemical equation?

Accepted Answer

2:4:3

Answer

1:2:3

Answer

1:2:1:5

Answer

1:1:2

Question 4

Aluminum (Al) has three electrons in its outer shell.  Oxygen (O) needs two electrons to complete its outer shell.  What is the chemical formula for aluminum oxide?

Accepted Answer

Al2O3

Answer

AlO

Answer

AlO2

Answer

Al2O

Question 5

What reaction has the following general formula:

AB --> A + B

Accepted Answer

Decomposition

Answer

Combination

Answer

Single Replacement

Answer

Double Replacement

Answer

Combustion

Question 6

What reaction has the following general formula:

A + CD --> C + AD

Accepted Answer

Single Replacement

Answer

Combination

Answer

Decomposition

Answer

Double Replacement

Answer

Combustion

Question 7

What reaction has the following general formula:

AB + CD --> CB + AD

Accepted Answer

Double Replacement

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Combustion

Question 8

What reaction has the following general formula:

A + B --> AB

Accepted Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Double Replacement

Answer

Combustion

Question 9

What reaction has the following general formula:
$$C_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O$$

Accepted Answer

Combustion

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Double Replacement

Question 10

What is the general reaction scheme for a single replacement reaction?

Accepted Answer

A + CD --> C + AD

Answer

A + B --> AB

Answer

AB --> A + B

Answer

AB + CD --> CB + AD

Answer

$$C_xH_y+O_2\ ->\ CO_2+H_2O$$

Question 11

What is the general reaction scheme for a combustion reaction?

Accepted Answer

$$C_xH_y+O_2\ ->\ CO_2+H_2O$$

Answer

A + B --> AB

Answer

AB --> A + B

Answer

A + CD --> C + AD

Answer

AB + CD --> CB + AD

Question 12

What is the general reaction scheme for a combination reaction?

Accepted Answer

A + B --> AB

Answer

AB --> A + B

Answer

A + CD --> C + AD

Answer

AB + CD --> CB + AD

Answer

$$C_xH_y+O_2\ ->\ CO_2+H_2O$$

Question 13

What is the general reaction scheme for a double replacement reaction?

Accepted Answer

AB + CD --> CB + AD

Answer

A + B --> AB

Answer

AB --> A + B

Answer

A + CD --> C + AD

Answer

$$C_xH_y+O_2\ ->\ CO_2+H_2O$$

Question 14

What is the general reaction scheme for a decomposition reaction?

Accepted Answer

AB --> A + B

Answer

A + B --> AB

Answer

A + CD --> C + AD

Answer

AB + CD --> CB + AD

Answer

$$C_xH_y+O_2\ ->\ CO_2+H_2O$$

Question 15

What type of reaction is the following:
$$2H_2+O_2->2H_2O$$

Accepted Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Double Replacement

Answer

Combustion

Question 16

What type of reaction is the following:
$$BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2$$

Accepted Answer

Double Replacement

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Combustion

Question 17

What type of reaction is the following:
$$C_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O$$

Accepted Answer

Combustion

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Double Replacement

Question 18

What type of reaction is the following:
$$2KI\ ->\ 2K\ +\ I_2$$

Accepted Answer

Decomposition

Answer

Combination

Answer

Single Replacement

Answer

Double Replacement

Answer

Combustion

Question 19

What type of reaction is the following:
$$2NaHCO_3->\ Na_2CO_3+CO_2+H_2O$$

Accepted Answer

Decomposition

Answer

Combination

Answer

Single Replacement

Answer

Double Replacement

Answer

Combustion

Question 20

What type of reaction is the following:
$$Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2$$

Accepted Answer

Single Replacement

Answer

Combination

Answer

Decomposition

Answer

Double Replacement

Answer

Combustion

Question 21

What type of reaction is the following:
$$3CuS\ +2Al\ ->\ Al_2S_3+3Cu$$

Accepted Answer

Single Replacement

Answer

Combination

Answer

Decomposition

Answer

Double Replacement

Answer

Combustion

Question 22

What type of reaction is the following:
$$2C_4H_{10}\ +13O_2\ ->\ 8CO_2+10H_2O$$

Accepted Answer

Combustion

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Double Replacement

Question 23

What type of reaction is the following:
$$Na_2S\ +2HCl\ ->\ H_2S+2NaCl$$

Accepted Answer

Double Replacement

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Combustion

Question 24

What type of reaction is the following:
$$Ag_3N\ +\ 3HBr->3AgBr+H_3N$$

Accepted Answer

Double Replacement

Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Combustion

Question 25

CxHy +O₂--> H₂O + CO₂

Accepted Answer

Combustion

Answer

Decomposition

Answer

Double replacement

Answer

Single Replacement

Question 26

One reactant into several products.

Accepted Answer

Decomposition

Answer

Synthesis

Answer

Combustion

Answer

Single Replacement

Question 27

One element replaces another in a compound.

Accepted Answer

Single Replacement

Answer

Synthesis

Answer

Combustion

Answer

Double Replacement

Question 28

This pictures simulates what type of reaction?

Accepted Answer

Double Replacement

Answer

Synthesis

Answer

Decomposition

Answer

Single Replacement

Question 29

KOH + H₃PO₄ --> K₃PO₄+H₂O

Accepted Answer

Double replacement

Answer

Synthesis (combination)

Answer

Decomposition

Answer

Single replacement

Question 30

Si + S₈ --> Si₂S₄

Accepted Answer

Synthesis (combination)

Answer

Decomposition

Answer

Single replacement

Answer

Double replacement

Question 31

Pb(NO₃)₂ --> PbO + NO₂ + O₂

Accepted Answer

Decomposition

Answer

Synthesis (combination)

Answer

Single replacement

Answer

Combustion

Question 32

3 Pb + 2 H₃PO₄ ----> 3 H₂ + 1 Pb₃(PO₄)₂

Accepted Answer

Single replacement

Answer

Synthesis (or combination)

Answer

Decomposition

Answer

Double replacement

Question 33

Combustion reactions will always involve

Accepted Answer

Oxygen and heat/energy

Answer

Oxygen and a solid

Answer

Liquid nitrogen and heat

Answer

CO and H₂O

Question 34

Combining substances to form a new substance

Accepted Answer

Synthesis

Answer

Displacement

Answer

Decomposition

Answer

Oxidation

Question 35

Breaking down a substance into simpler substances

Accepted Answer

Decomposition

Answer

Displacement

Answer

Synthesis

Answer

Oxidation

Question 36

Combining a substance with oxygen

Accepted Answer

Oxidation

Answer

Displacement

Answer

Synthesis

Answer

Decomposition

Question 37

Switching one substance for another

Accepted Answer

Displacement

Answer

Synthesis

Answer

Decomposition

Answer

Oxidation

Question 38

Having to do with heat

Accepted Answer

Thermic

Answer

Displacement

Answer

Synthesis

Answer

Decomposition

Question 39

Which of the following is an example of a chemical change?

Accepted Answer

using magnesium to displace hydrogen gas from water

Answer

melting a stick of butter

Answer

dissolving salt in water

Question 40

Which of the following is an example of a physical change to matter?

Accepted Answer

freezing

Answer

rusting

Answer

digestion

Question 41

Photosynthesis is a chemical reaction that involves the production of glucose (sugar) from carbon dioxide and water in the presence of sunlight. Photosynthesis is what kind of reaction?

Accepted Answer

Endothermic

Answer

Exothermic

Answer

Decomposition

Question 42

During an endothermic reaction, what happens to energy in relation to the surroundings?

Accepted Answer

absorbed from

Answer

released to

Answer

mixed with

Question 43

During an exothermic reaction, what happens to energy in relation to the surroundings?

Accepted Answer

released to

Answer

absorbed from

Answer

mixed with

Question 44

In a cold pack, which type of reaction draws heat from the surroundings?

Accepted Answer

endothermic

Answer

exothermic

Answer

exergonic

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