Quiz about Chemical Reactions

Question 1

Which equation below demonstrates the law of conservation of mass?

Accepted Answer

4Cu + O₂ --> 2Cu₂O

Answer

Mg + S --> MgS₂

Answer

C + O₂ --> C₂O

Answer

H₂SO₄ + Zn --> 4ZnSO + H₂

Question 2

What type of reaction is displayed below?

2KClO₃ --> 2KCl + 3O₂

Accepted Answer

decomposition

Answer

synthesis

Answer

single replacement

Answer

double replacement

Question 3

Chemical equations must be balanced because

Accepted Answer

mass can neither be created nor destroyed

Answer

the mass of the reactants is always greater than the mass of the products

Answer

the mass of the products is always greater than the mass of the reactants

Answer

mass is determined by a chemical reaction

Question 4

Which equation correctly illustrates conservation of mass?

Accepted Answer

Question 5

Look at the following chemical equation

4Al + 3O₂ --> 2Al₂O₃

What is true about this chemical equation?

Accepted Answer

The products contain the same numbers and types of atoms as the reactants.

Answer

The products contain the same arrangement of atoms as found in the reactants.

Answer

The products contain the same numbers but not the same types of atoms as the reactants.

Answer

The products contain the same types but not the same numbers of atoms as the reactants.

Question 6

Look at the following equation

__Au₂O₃ --> __Au + __ O₂

In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from left to right?

Accepted Answer

2, 4, 3

Answer

1, 2, 1

Answer

2, 1, 3

Answer

1, 1, 3

Question 7

The balanced chemical equation below shows the reaction between nitrogen (N₂) and hydrogen (H₂) to form ammonia (NH₃)

N₂ + 3H₂ --> 2NH₃

If 15.0 grams of nitrogen is reacted to produce 40.0 grams of ammonia, how many grams of hydrogen were used?

Accepted Answer

25 g

Answer

15 g

Answer

10 g

Answer

55 g

Question 8

If the chemical equation below is balanced, what number would go in front of oxygen (O2)?

Accepted Answer

9

Answer

4

Answer

6

Answer

3

Question 9

If the chemical equation below is balanced, what number would go in front of HClO3?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 10

The equation shows an unbalanced chemical reaction. What are the missing coefficients that are needed to make this equation balanced from left to right?

___Fe + ___O₂ --> ___Fe₂O₃

Accepted Answer

4, 3, 2

Answer

1, 1, 1

Answer

2, 3, 1

Answer

2, 3, 2

Question 11

For the equation below, if 10 grams of H₂ is added to

20 g of O₂, how much H₂O can be made?

2H₂ + O₂ --> 2H₂O

Accepted Answer

30g

Answer

20g

Answer

10g

Answer

5 g

Question 12

What type of reaction is displayed?

Accepted Answer

single displacement

Answer

synthesis

Answer

decomposition

Answer

double displacement

Question 13

What type of reaction is displayed above?

Accepted Answer

synthesis

Answer

decomposition

Answer

single replacement

Answer

double replacement

Question 14

Which diagram illustrates the law of conservation of matter?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 15

This reaction would best be described as a...

Accepted Answer

single displacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

double displacement reaction

Question 16

Which equation below is a double displacement?

Accepted Answer

MgCl₂ + Li₂CO_{3 -->} MgCO₃ + 2 LiCl

Answer

C₆H₁₂ + 9 O₂ --> 6 CO₂ + 6 H₂O

Answer

Pb + FeSO₄ --> PbSO₄ + Fe

Answer

CaCO₃ --> CaO + CO₂

Question 17

How much BaSO₄ is produced in this reaction?

BaCl₂ + Na₂SO₄ --> NaCl + BaSO₄

30g..........10g --> ....12g......... ?

Accepted Answer

28 g

Answer

40 g

Answer

52 g

Answer

38 g

Question 18

What is the coefficient that belongs in front of the NaCl in the chemical equation below?

AlCl₃ + Na₂S --> Al₂S₃ + NaCl

Accepted Answer

6

Answer

2

Answer

3

Answer

4

Question 19

The reaction would be classified as...

Accepted Answer

single replacement

Answer

synthesis

Answer

decomposition

Answer

double replacement

Question 20

For the equation below, if 12 grams of Pb is mixed with 32 grams of FeSO_4,28 grams of PbSO₄ are made. How much Fe is produced?

Pb + FeSO₄ --> PbSO₄ + Fe

Accepted Answer

16 grams

Answer

44 grams

Answer

32 grams

Answer

72 grams

Question 21

Edwin places 60 mL of HCl in a 100mL beaker and 60 mL of NaOH in a 100mL beaker. He places them on a scale together and measures a combined mass of 12.0 grams. Then he mixes the liquids together and waits five minutes while they react. What would the mass be after the reaction takes place?

Accepted Answer

12.0 grams

Answer

60 grams

Answer

120 grams

Answer

48.0 grams

Question 22

Balance the equation:

H₂+ O₂ --> H₂O

Then determine which diagram below accurately represents the balanced equation.

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

Not enough information

Question 23

Which of the following is a balanced chemical equation?

Accepted Answer

P₄ + 3O₂ --> 2P₂O₃

Answer

MgF₂ + Li₂CO₃ --> MgCO₃ + LiF

Answer

CH₄ + 2O₂ --> CO₂ + H

Answer

2Al + 6HCl --> 3H₂ + AlCl₃

Question 24

What is the general form for a single-replacement reaction?

Accepted Answer

A + BX --> AX + B

Answer

AX + BY --> AY + BX

Answer

AB --> A + B

Answer

A + B --> AB

Question 25

Which of the following is a balanced chemical equation for the following reaction:

Mg + HCl --> MgCl₂ + H₂

Accepted Answer

Mg + 2HCl --> MgCl₂ + H₂

Answer

2Mg + 2HCl --> MgCl₂ + H₂

Answer

Mg + (HCl)₂ --> MgCl₂ + H₂

Answer

Mg + H₂Cl₂ --> MgCl₂ + H₂

Question 26

A reaction in which 2 Ca and a single molecule of O₂ combine to make 2 CaO's would be classified as a...

Accepted Answer

synthesis

Answer

decomposition

Answer

single replacement

Answer

double replacement

Question 27

The reaction would be classified as a...

Accepted Answer

decomposition

Answer

synthesis

Answer

single displacement

Answer

double displacement

Question 28

Balance:

___ NaF + ____ Br₂ ---> ___ NaBr + ____ F₂

Accepted Answer

2, 1, 2, 1

Answer

1, 2, 1, 2

Answer

3, 2, 3, 2

Answer

2, 4, 2, 4

Question 29

_CF₄+ _Br₂--> _CBr₄+ _F₂

_{Balance the equation.}

Accepted Answer

1, 2, 1, 2

Answer

2, 1, 2, 1

Answer

1, 3, 1, 3

Answer

1, 4, 1, 4

Question 30

Given the reaction:

NaF + Br₂ ---> NaBr + F₂

If 10 g of NaF and 14 g of Br₂ react, how many grams of NaBr would be produced if 11 g of F₂made?

Accepted Answer

13 g

Answer

24 g

Answer

35 g

Answer

7 g

Question 31

Two clear liquids are mixed together and a white powder forms. What are the evidences of a chemical reaction?

Accepted Answer

precipitate formed and unexpected color change

Answer

unexpected color change and temperature change

Answer

gas produced and precipitate formed

Answer

temperature change and gas produced

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