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Chemical Equations Review

Total questions: 69

Worksheet time: 2hrs 18mins

Name
Class
Date
1.

How many hydrogen atoms are in this chemical formula:

a)

4 hydrogen atoms

b)

1 hydrogen atom

c)

2 hydrogen atoms

d)

3 hydrogen atoms

2.

How many molecules are in this chemical formula?

a)

4 Molecules

b)

6 Molecules

c)

2 Molecules

d)

5 Molecules

3.

How many Iron (Fe) atoms are in this chemical formula?

a)

2 iron atoms

b)

6 iron atoms

c)

5 iron atoms

d)

4 iron atoms

4.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

5.

How many molecules are in this chemical formula?

a)

5 molecules

b)

4 molecules

c)

2 molecules

d)

6 molecules

6.

Is this balanced?...

Fe + S --> FeS

a)

YES!

b)

NO!

7.

How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

1

d)

4

8.

What coefficient should be used to make the following equation balanced?

N2+O2--> _NO

a)

1

b)

2

c)

3

d)

4

9.

Balance this equation...

HgO --> 2Hg + O2

a)

It is balanced

b)

2HgO --> Hg + O2

c)

2HgO --> 2Hg + O2

10.

Is this balanced?...

Al + O2 --> 2Al2O3

a)

Yes!

b)

NO!

11.

C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2
Given this chemical equation, what are the REACTANTS?

a)

C2H6 and 5O2C_2H_{6\ }and\ 5O_2

b)

2CO2 and 3H2O22CO_2\ and\ 3H_2O_2

12.

C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2
Given this chemical equation, what are the PRODUCTS?

a)

C2H6 and 5O2C_2H_{6\ }and\ 5O_2

b)

2CO2 and 3H2O22CO_2\ and\ 3H_2O_2

13.

What is the arrow in a chemical equation...

H2 + O --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

14.

What is the right part of a chemical equation called...

H2 + O --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

15.

What is the left part of a chemical equation called...

H2 + O --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

16.

Chemical formulas are used to represent _________________.

a)

reactions

b)

substances

c)

processes

d)

none of the above

17.

Chemical equations are used to represent _________________.

a)

reactions

b)

substances

c)

processes

d)

none of the above

18.

The small numbers under and to the right of element symbols in a formula are called _________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

19.

The large numbers before a chemical formula that are used as multipliers are known as __________________.

a)

element symbols

b)

exponents

c)

coefficients

d)

subscripts

20.

A ___________________ uses chemical formulas, plus signs, and an arrow to represent a chemical reaction

a)

chemical formula

b)

chemical equation

c)

element symbol

d)

inventory

21.

The materials we start with in a reaction are known as __________________.

a)

chemicals

b)

reactants

c)

products

d)

creations

22.

The materials we end with in a reaction are known as __________________.

a)

chemicals

b)

reactants

c)

products

d)

creations

23.

Determine the type of reaction for the following:

2 K + FeCl2 → 2KCl + Fe

a)

Single Replacement

b)

Double Replacement

c)

Synthesis

d)

Combustion

24.

Determine the type of reaction for the following:

2AgNO3 + Ca(OH)2→ Ca(NO3)2 + 2Ag2O

a)

Single Replacement

b)

Double Replacement

c)

Synthesis

d)

Decomposition

25.

Determine the type of reaction for the following:

2CuI→ Cu + I2

a)

Single Replacement

b)

Double Replacement

c)

Synthesis

d)

Decomposition

26.

AB + CD = AD + CB

a)

Double Replacement

b)

Single Replacement

c)

Combustion

d)

Decomposition

27.

Classify

Fe + O2 → Fe2O3

a)

synthesis

b)

decomposition

c)

double replacement

d)

single replacement

28.

Classify

FeS + HCl → H2S + FeCl2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

29.

Fill in the blank:

A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

a)

balanced

b)

transferred

c)

rearranged

d)

beautiful

30.

An element plus additional element reacts to form one product is an example of which type of chemical reaction?

a)

Decomposition

b)

double replacement

c)

synthesis

d)

single replacement

31.

A reaction in which two reactants switch to form a new product.

a)

Decompostion

b)

double replacement

c)

synthesis

d)

single replacement

32.

A reaction in which substances break down into its parts after a chemical reaction.

a)

Decompostion

b)

double replacement

c)

synthesis

d)

single replacement

33.

Classify

Zn + H2S → ZnS + H2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

34.

Classify

CH4 + O2 → CO2 + H2O

a)

single replacement

b)

double replacement

c)

synthesis

d)

combustion

35.

Classify

FeS + HCl → H2S + FeCl2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

36.

Pb(NO3)2 + KI --> PbI2 + KNO3

What type of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

37.

2HI --> H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

38.

Mg + HCl --> MgCl2 + H2

a)

combustion

b)

synthesis

c)

decomposition

d)

single replacement

39.

Mg + N2 →Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

40.

Two Reactants and One Product

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

41.

One reactant into several products.

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

42.

One element replaces another in a compound.

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

43.

The metal ions in two compounds switch.

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

44.

What is the type of reaction shown above?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

45.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double replacement

b)

Synthesis

c)

Acid base

d)

Combustion

46.

Identify the type of reaction:

ZnCl2 + Mg --> Zn + MgCl2

a)

Precipitate

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

47.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

48.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

49.

Mg + ___ HCl → MgCl2 + H2

a)

1

b)

2

c)

3

d)

4

50.

Which problem is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

51.

Is Li3PO4 soluble?

a)

Yes, Li is always soluble

b)

No, PO4 is never soluble

c)

No, no rules apply

52.

Is NH4Cl soluble?

a)

Yes

b)

No

53.

Is Mg(NO3)2 soluble?

a)

Yes, NO3 is usually soluble.

b)

No, Mg is not soluble

c)

No, there is no rule that applies

54.

Is MgCl2 soluble?

a)

Yes, chlorides are soluble

b)

No, Mg is an exception to the rule

c)

No, no rule applies

55.

Is PbF2 soluble?

a)

Yes, fluorides are soluble

b)

No, lead is exception to the rule

c)

No, no rule applies

56.

Is aluminum sulfate soluble?

a)

Yes, sulfates are usually soluble

b)

No, aluminum is an exception to the rule

c)

No, no rule applies

57.

Is HgSO4 soluble?

a)

Yes, sulfates are usually soluble

b)

No, mercury is an exception to the rule

c)

No, no rule applies

58.

Is Al2O3 soluble?

a)

Yes

b)

No

59.

Is Ca3N2 soluble?

a)

Yes

b)

No

60.

Which of the following compounds made with a group 7 anion is soluble?

a)

AgClAgCl

b)

PbF2PbF_2

c)

MgBr2MgBr_2

61.

Which oxide is soluble?

a)

magnesium oxide

b)

lithium oxide

c)

carbon dioxide

62.

Select ALL compounds that are soluble.

a)

lithium chloride

b)

lead (II) fluoride

c)

magnesium sulfide

d)

magnesium sulfate

63.

Will fluorine and sodium chloride react?

a)

Yes, fluorine will replace chlorine.

b)

Yes, fluorine will replace sodium.

c)

No, there won't be a reaction.

64.

Will bromine and sodium chlorine react?

a)

Yes, bromine will replace chlorine.

b)

Yes, bromine will replace sodium.

c)

No, they will not react.

65.

Will iodine and sodium chloride react?

a)

Yes, iodine will replace chlorine.

b)

Yes, iodine will replace sodium.

c)

No, they will not react.

66.

Will chlorine and sodium iodide react?

a)

Yes, chlorine will replace iodine.

b)

Yes, chlorine will replace sodium.

c)

No, they will not react.

67.

Will magnesium and hydrochloric acid (HCl) react?

a)

Yes, magnesium will replace the hydrogen.

b)

Yes, magnesium will replace the chlorine.

c)

No, they will not react.

68.

Will copper and hydrochloric acid (HCl) react?

a)

Yes, copper will replace hydrogen.

b)

Yes, copper will replace chlorine.

c)

No, they will not react.

69.

Will fluorine and hydrochloric acid (HCl) react?

a)

Yes, fluorine will replace the hydrogen

b)

Yes, fluorine will replace the chlorine.

c)

No, they won't react.

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