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Chemical Equation

Total questions: 60

Worksheet time: 51mins

Name
Class
Date
1.

In Chemical Equations the Reactants are on the (a)   side.

2.

In Chemical Equations the Products are on the (a)   side.

3.

What are the Reactants in this Chemical Equation?

a)

CH4 + 2O2

b)

CO2 + 2H2O

c)

CO2 + 2O2

d)

CH4 + 2H20

4.

What are the Products in this Chemical Equation?

a)

CH4 + 2O2

b)

CO2 + 2H2O

c)

CH4 + 2H2O

d)

2O2 + CO2

5.

A shorthand representation of an element or compound using chemical symbols.

a)

Chemical Equation

b)

Chemical Formula

c)

Molecule

d)

Subscript

6.

A representation of a chemical reaction using chemical symbols for elements and compounds.

a)

Chemical Formula

b)

Chemical Equation

c)

molecule

d)

subscript

7.

Two more atoms chemically combined.

a)

atom

b)

subscript

c)

coefficient

d)

molecule

8.

The number written after an element’s symbol in a chemical formula that indicates the number of atoms of a specific element.

a)

coefficient

b)

subscript

9.

The number in front of an element or compound that indicates the number of molecules in a chemical formula.

a)

coefficient

b)

subscript

10.

The number of atoms for each element are equal for the reactants and products.

a)

balanced equation

b)

unbalanced equation

11.

The number of atoms for each element are not equal for the reactants and products.

a)

balanced equation

b)

unbalanced equation

12.

The Law of Conservation of Mass states that:


Matter cannot be created or destroyed – the mass of the products in a chemical reaction must be equal to the mass of the reactants.

a)

True

b)

False

13.

A type of reaction in which two or more substances combine and form one compound is a _________ reaction.

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

14.

One element replaces another element in a compound in this type of reaction.

a)

synthesis

b)

decomposition

c)

double replacement

d)

single replacement

15.

A substance that increases reaction rate by lowering the activation energy of a reaction

a)

enzyme

b)

inhibitor

c)

catalyst

d)

coefficient

16.

Chemical reactions that absorb thermal energy are _____________ reactions.

a)

exothermic

b)

endothermic

c)

synthesis

d)

decomposition

17.

A description of a reaction using symbols and chemical formulas

a)

reactant

b)

product

c)

chemical reaction

d)

chemical equation

18.

A chemical reaction that releases thermal energy

a)

exothermic

b)

endothermic

c)

single replacement

d)

double replacement

19.

A process in which atoms of one or more substances rearrange to form one or more new substances

a)

chemical reaction

b)

chemical production

c)

physical change

d)

chemical change

20.

A chemical reaction in which a substance combines with oxygen and releases energy

a)

synthesis

b)

combustion

c)

endothermic

d)

decomposition

21.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
22.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
23.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
24.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
25.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
26.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
27.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
28.
If four hydrogen atoms react with two hydrogen atoms, how many atoms will be in the product?
a)
6
b)
4
c)
8
d)
2
29.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

30.

Balanced this equation:

Sb2S3 + O2 ---> Sb + SO2

a)

It is balanced.

b)

Sb2S3 + O2 ---> 2Sb + SO2

c)

Sb2S3 + 3O2 ---> 2Sb + 3SO2

d)

3Sb2S3 + 3O2 ---> 2Sb + SO2

31.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
32.
Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 
a)
(s)=solid
b)
(g)=grams
c)
(l)=liquid
d)
(aq)= aqueous
33.

Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal

a)

Zn + AgCl → ZnCl2 + Ag

b)

ZnCl2 + Ag → Zn + AgCl

c)

ZnCl2 + Ag2 → Zn + AgCl

d)

Zn2Cl + Ag → Zn + AgCl

34.

Which is the correct chemical equation for the following: Barium Chloride combined with sodium sulfide yields barium sulfide and sodium chloride

a)

BaCl + NaS → BaS+ NaCl

b)

BaCl2 + Na2S → BaS+ NaCl

c)

BaS+ NaCl → BaCl + NaS

d)

BaCl2 + Na2S → BaS+ NaCl2

35.
Which is NOT a diatomic molecule?
a)
Fluorine
b)
Nitrogen
c)
Boron
d)
Bromine
36.

Magnesium can be burned in oxygen to produce solid magnesium oxide.

a)

Mg(s) + O2(g)→ MgO(s)

b)

Mg(s) + O(g) → MgO(s)

c)

Mg(s) + CO2(g) → MgO(s) + C(s)

d)

Mg(s) + O2(g) → Mg2O2(s)

37.

True/False: There are 2 reactants in the chemical equation below.
 KClO3 → KCl + O2KClO_3\ \rightarrow\ KCl\ +\ O_2  

a)

True

b)

False

38.

Translate the word equation below:

Nitrogen reacts with Hydrogen to form Ammonia (NH3).

a)

N → H + NH3N\ \ \rightarrow\ H\ +\ NH_3

b)

N2 + H2 → NH3N_2\ +\ H_2\ \rightarrow\ NH_3

c)

N + H → NH3N\ +\ H\ \rightarrow\ NH_3

d)

N2 → H2 + NH3N_2\ \rightarrow\ H_2\ +\ NH_3

39.

Translate the word equation below.

Hydrogen and Carbon Dioxide react to form Carbonic Acid (H2CO3).

a)

H + CO2 → H2CO3H\ +\ CO_2\ \rightarrow\ H_2CO_3

b)

H → CO2 + H2CO3H\ \rightarrow\ CO_2\ +\ H_2CO_{3_{ }}

c)

H2 + CO2 → H2CO3H_2\ +\ CO_2\ \rightarrow\ H_2CO_3

d)

H2 → CO2 + H2CO3H_2\ \rightarrow\ CO_2\ +\ H_2CO_3

40.
Which is the correct formula for the compound Chromium (II) Nitrate?
a)
Cr2NO3
b)
(Cr)2NO3
c)
CrNO2
d)
Cr(NO3)2
41.
Which is the correct formula for the compound formed between beryllium and nitrogen?
a)
BeN
b)
Be3N
c)
Be3N2
d)
Be2N3
42.
Which is the correct name for the compound PCl5?
a)
monophosphorus tetrachloride
b)
phosphorus chloride
c)
phosphorus pentachloride
d)
pentaphosphorus chloride
43.
Which type of chemical reaction is shown?
a)
double replacement
b)
composition
c)
combustion
d)
decomposition
44.
Which type of reaction can be recognized by the general pattern?
a)
combustion
b)
single replacement
c)
composition
d)
decomposition
45.
Which type of reaction is Al  +  O2   → Al2O3?
a)
composition
b)
decomposition
c)
single replacement
d)
combustion
46.
What is the molar mass of hydrogen peroxide (H2O2)?
a)
9 g/mol
b)
17 g/mol
c)
18 g/mol
d)
34 g/mol
47.
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?
a)
AlO
b)
AlO2
c)
Al2O
d)
Al2O3
48.
Write the unbalanced equation for aluminum bromide reacting with rubidium acetate.
a)
AlBr + RbC2H3O2 --> AlC2H3O2 + RbBr
b)
AlBr3 + RbC2H3O2 --> Al(C2H3O2)3 + RbBr
c)
AlBr3 + RbC2H3O2 --> AlRb + BrC2H3O2
d)
AlBr3 + RbC2H3O2 --> AlRb3 + BrC2H3O2
49.
A chemical reaction is ___________________.
a)
when substances undergo changes that result in a new substance
b)
a characteristic of a substance that can be observed without changing the substance into another substance
c)
when substances undergo changes that alter their form or physical appearance
50.
Which of the following is a reactant in this equation? 
Methane gas (CH4) reacts with Oxygen gas (O2) to produce  water and carbon dioxide gas (CO2).
a)
CO2
b)
CH4
c)
H2
d)
CH2
51.

All of the following are chemical reactions EXCEPT ___

a)

A. burning of paper

b)

B. potassium fluoride and calcium nitrate are mixed.

c)

C. sodium hydroxide is added to nitric acid

d)

D. freezing of potassium nitrate solution.

52.

Which of the following changes would you consider to be a chemical change?

a)

A. Candle wax solidifies when it is cooled.

b)

B. Baking soda is combined with vinegar

c)

C. Ice melts.

d)

D. Paper turned into pieces.

53.

Balancing a chemical equation involves ____

a)

A. adjusting the subscripts

b)

B. adjusting both subscripts and coefficients

c)

C. adjusting the coefficients

d)

D. adjusting the masses of reactants and products

54.
What is the name of C3Cl8 ?
a)
Carbon octachloride
b)
Tricarbon octachloride
c)
Carbon trichloride
d)
Octacarbon trichloride
55.

What is the name of Br6F10 ?

a)

Bromium fluoride

b)

Hexabromine fluoride

c)

Bromium decafluoride

d)

Hexabromine decafluoride

56.
The correct name of Cu₃N₂ is
a)
copper (III) nitride
b)
copper (II) nitride
c)
copper nitride
d)
tricopper dinitride
57.
Roman numerals tell you the ____ of the metal cation(s) in an ionic compound.
a)
number
b)
mass
c)
type
d)
charge
58.
True or false: When naming ionic compounds, use prefixes to indicate subscripts
a)
True
b)
False
59.

The formula of magnesium chloride is

a)

MgCl

b)

MgCl2

c)

MgCl3

60.

The formula of sodium carbonate is

a)

NaCO3

b)

Na(CO3)2

c)

Na2CO3

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