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WorksheetsChemical Reactions
Total questions: 68
Worksheet time: 2hrs 16mins
Name
Class
Date
1.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
2.
2 NH3+ 1 H2SO4 ----> 1 (NH4)2SO4
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
3.
3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
4.
1 Li3N + 3 NH4NO3 ----> 3 LiNO3 + 1 (NH4)3N
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
5.
Pb + FeSO4 ----> PbSO4 + Fe
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
6.
CaCO3 ----> CaO + CO2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
7.
P4 + 3 O2 ----> 2 P2O3
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
8.
O3 ----> O. + O2
a)
Synthesis (or combination)
b)
Decomposition
c)
Single displacement
d)
Double displacement
9.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
10.
Switching one substance for another
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
11.
What type of reaction is the equation C + O2 → CO2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
12.
Which of the following is an example of a chemical change?
a)
melting a stick of butter
b)
dissolving salt in water
c)
using magnesium to displace hydrogen gas from water
13.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
14.
Which generalized equation represents a synthesis reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
15.
Which generalized equation represents a decomposition reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
16.
Which generalized equation represents a single displacement reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
17.
Which of the following represents a chemical change?
a)
cutting a piece of paper with scissors
b)
cooling a mixture of air and kerosene vapor to obtain liquid kerosene
c)
burning a piece of notebook paper in the presence of oxygen
d)
heating water over a flame to its boiling point
18.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
19.
Your mother used pancake mix, eggs, and milk to make pancakes. Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
20.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
21.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water changing to ice
c)
saltwater
d)
paper being cut in half
22.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
23.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
24.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
25.
Which of the following is the general formula for a decomposition reaction?
a)
A + B → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
26.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
27.
Which chemical reaction forms Carbon Dioxide and Water?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
28.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
29.
Balance this reaction:
____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4
a)
1,3,3,1
b)
1,3,2,1
c)
2,3,3,1
d)
1,1,3,1
30.
Balance this reaction:
____ NaF + ____ Br2 ---> ___ NaBr + ____ F2
a)
3,1,2,1
b)
1,2,3,4
c)
2,1,2,1
d)
1,2,1,2
31.
What do the coefficients need to be in the following equation in order to be balanced?
_Al +_HCl → _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
32.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
33.
Which type of reaction is:
C7H16 + 10 O2 → 7 CO2 + 8 H2O
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
34.
Which type of reaction is:
2 K + MgBr2 → 2 KBr + Mg
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
35.
Which type of reaction is:
4 (NH4)3PO4 + 3 Pb(NO3)4 → 12 NH4NO3 + Pb3(PO4)4
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
36.
The tiny pieces that all matter is made of is called
a)
electrons
b)
molecules
c)
super electrons
d)
atoms
37.
The arrow in a chemical reaction is known as
a)
yield/produce
b)
mixture
c)
energy
d)
equals
38.
Evidence(s) that a chemical reaction occurred is(are)
a)
Change in color
b)
change in state of matter
c)
change in temperature
d)
all are correct
39.
To change the order or position of something
a)
chemical reaction
b)
rearrange
c)
extended structure
d)
model
40.
This states that Matter can neither be created nor destroyed.
a)
Law of Conservation of Matter
b)
Law of Gravity
c)
Law of Inertia
d)
Law of Conservation of Energy
41.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
42.
Classify
CH4 + O2 → CO2 + H2O
CH4 + O2 → CO2 + H2O
a)
single replacement
b)
double replacement
c)
synthesis
d)
combustion
43.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
44.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
45.
What is the scientific term given when something burns?
a)
a fuel
b)
flammable
c)
combustion
d)
heating
46.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
47.
Which elements are(is) not balanced?
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
LiNO3 +CaBr2 --> Ca(NO3)2 + LiBr
a)
Li
b)
Ca and Li
c)
O and N
d)
Ca
48.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
49.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
50.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
51.
Which of the following is the correct balanced equation?
a)
2Cu +AgNO3 → 2Cu(NO3)₂ + 2Ag
b)
Cu + 2AgNO3 → Cu(NO3)₂ + 2Ag
c)
Cu + 2AgNO3 → Cu(NO3)₂ + Ag
d)
Cu + AgNO3 → Cu(NO3)₂ + Ag
e)
2Cu + 2AgNO3 → Cu(NO3)₂ + Ag
52.
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
53.
Which chemical reaction forms Carbon Dioxide and Water?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
54.
One of the signs of a chemical reaction taking place is:
a)
Bubbles are produced
b)
Reactants are not combining
c)
Products are not forming
d)
Color is not changing
55.
Aqueous means...
a)
dissolved in water/solution
b)
water
c)
liquid
d)
plasma
56.
A precipitate is a
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
57.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
58.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
59.
Write a balanced equation for this DR reactions [Fe has a charge of 3+ and NO3 has a charged of 1-]
NaOH + Fe(NO3)3 →
a)
NaFe + OH(NO3)3
b)
2NaNO3 + 3Fe(OH)3
c)
NaNO3 + FeOH
d)
3NaNO3 + Fe(OH)3
60.
What are the products of fluorine reacting with potassium phosphide
a)
F + KP → K + FP
b)
F2 + K3P → F2K3 + P
c)
F2 + K3P → KF + P
d)
F2 + K3P → KF + P2
61.
Balance the following equation:
BF3 + H2O --> B2O3 + HF
What is the coefficient of HF?
a)
3
b)
6
c)
9
d)
5
62.
Balance the reaction:
C2H4O2 + O2 --> CO2 + H2O
What is the coefficient for CO2?
a)
2
b)
4
c)
1
d)
6
63.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
64.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
60
65.
Magnesium can be burned in oxygen to produce solid magnesium oxide.
a)
2Mg + O2→ 2MgO
b)
Mg + O→ MgO
c)
2Mg + O2 → Mg2O2
d)
Mg + O2→ MgO
66.
Sodium phosphate and calcium chloride produce calcium phosphate and sodium chloride
a)
2Na3PO4 + 3CaCl2 --> 2Ca3(PO4)2 + 6NaCl
b)
2Na3PO4 + 6CaCl2 --> 2Ca4PO2 + 6NaCl
c)
2NaPO4 + 3CaCl2 --> 2Ca(PO4)2 + 6NaCl
d)
2NaPO4 + 6CaCl2 --> 2Ca2(PO4)3 + 3NaCl
67.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
68.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
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