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WorksheetsBalancing equations
Total questions: 42
Worksheet time: 11hrs 30mins
Name
Class
Date
1.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
2.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
3.
What are the REACTANTS :
H2O + CO2 → HCO + HO
a)
H2O + CO2
b)
HCO + HO
c)
H2O ONLY
d)
HCO ONLY
4.
Does this follow the law of conservation of mass:
Yes No
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
Yes
b)
No
5.
Does this follow the law of conservation of mass:
Yes No
Al + O2 → 2Al2O3
a)
Yes
b)
No
6.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
7.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
8.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
9.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
10.
What are the REACTANTS :
H2O + CO2 → HCO + HO
a)
H2O + CO2
b)
HCO + HO
c)
H2O ONLY
d)
HCO ONLY
11.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
12.
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
13.
If there are 4 H atoms on the reactant side, how many H atoms will be on the product side?
a)
2
b)
4
c)
6
d)
You need more information to answer this question
14.
What is a SUBSCRIPT?
a)
The large number next to a molecule
b)
The small number on the bottom right of an atom
c)
The small number on the top left of an atom
d)
The large number at the end of a molecule
15.
A jeweler melts gold to make jewelry. As the gold melts, the mass
a)
increases
b)
decreases
c)
is destroyed
d)
stays the same
16.
If 10 grams of water are added to 5 grams of salt, how much salt water will be made?
a)
2 grams
b)
5 grams
c)
10 grams
d)
15 grams
17.
A student wanted to make a salad. The student weighed each vegetable before cutting and placing it in the salad. Which best describes the weight of the salad compared to the total weight of the vegetables?
a)
The total weight of the vegetables will be the same as the weight of the salad because the vegetables did not lose or gain weight.
b)
The total weight of the vegetables will be more than the weight of the salad, because cutting the vegetables increased their weight.
c)
The total weight of the vegetables will be less than the weight of the salad, because the vegetables weigh less when they are cut.
d)
The weight of the salad will be more than the total weight of the vegetables, because the vegetables were chemically changed.
18.
If 10 grams of water are added to 5 grams of salt, how much salt water will be made?
a)
2 grams
b)
5 grams
c)
10 grams
d)
15 grams
19.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
20.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
21.
Na + MgF2 ⋙ NaF + Mg
a)
2 Na + MgF2 ⋙ 2 NaF + Mg
b)
3 Na + MgF2 ⋙ 2 NaF + Mg
c)
2 Na + MgF2 ⋙ 2 NaF2 + Mg
d)
2 Na + MgF2 ⋙ 2 NaF + 2Mg
22.
Noble gases are ____ because their outermost energy level (electron shell) is full.
a)
Reactive
b)
Nonreactive
c)
Product
d)
electrons
23.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
24.
_Na3PO4+_KOH --->
_NaOH + _ K3PO4
_NaOH + _ K3PO4
a)
1 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
c)
1 Na3PO4+2 KOH
--->
2 NaOH + 1 K3PO4
--->
2 NaOH + 1 K3PO4
d)
3 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
25.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
26.
In this image, what are the information to the right of the arrow (in black) is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
27.
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
28.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
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.
29.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
30.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
31.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
32.
What is the arrow in a chemical equation...
H2 + O2 --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
33.
Balance this equation...
H2 + Cl2 --> HCl
H2 + Cl2 --> HCl
a)
It is balanced
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
d)
I don't know! Oh well.
34.
Balance this equation...
HgO --> 2Hg + O2
HgO --> 2Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
35.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
36.
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
37.
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
38.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
39.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO3
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
40.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
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.
41.
Which of the following correctly balances this equation:
Sodium phosphate and potassium hydroxide will produce sodium hydroxide and potassium phosphate.
a)
1 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH + 1 K3PO4
c)
1 S3PO4+3 SOH
--->
3 SOH + 1 K3PO4
d)
3 Na3P+3 KO2H
--->
3 NaH2O + 1 K3P
42.
What coefficient belongs with hydrochloric acid?
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
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