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WorksheetsChemical Equations
Total questions: 30
Worksheet time: 32mins
Name
Class
Date
1.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
2.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
3.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
4.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
5.
A synthesis chemical reaction/equation occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
6.
How would this equation be classified?
O2 + 2H2 --> 2H2O
O2 + 2H2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Single Displacement
7.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
8.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
d)
the arrow is pointing in the wrong direction
9.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
10.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
11.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
12.
CaCO3 represents a chemical…
a)
symbol
b)
formula
c)
subscript
d)
reaction
13.
In chemical reactions, what does the principle of conservation of mass mean?
a)
The total mass of the reactants is greater than the total mass of the products.
b)
Matter is not changed.
c)
Matter is not created or destroyed.
d)
The total mass of the reactants is less than the total mass of the products.
14.
Which of the following is a balanced chemical equation?
a)
2Mg + HCl --> MgCl2 + H2
b)
H2O2 --> H2O + O2
c)
SO2 + O2 + 2H2O --> 4H2SO4
d)
2Fe2O3 + 3C --> 4Fe + 3CO2
15.
Which is the correct balanced chemical equation for the following statement? Sodium reacts with Oxygen to produce Sodium oxide.
a)
Na2O + O2 --> 2Na
b)
Na2 + O2 --> 2NaO
c)
Na2O --> 2Na + O2
d)
4Na + O2 --> 2Na2O
16.
Black = Carbon (C)
White = Hydrogen (H)
What would be the formula for ethane?
White = Hydrogen (H)
What would be the formula for ethane?
a)
CH4
b)
CH6
c)
C2H2
d)
C2H6
17.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
an atom
b)
the subscript
c)
a molecule
d)
the coefficient
18.
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
19.
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same.
b)
The product always weighs more than the reactant.
c)
The reactant will weigh more than the product.
d)
They both will lose mass after the reaction.
20.
Which is the correct formula for 3 hydrogen atoms, one sulfur atom, and four oxygen atoms?
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
21.
How many atoms of aluminum are on each side of the following equation:
4Al + 3O2 → 2Al2O3
4Al + 3O2 → 2Al2O3
a)
2
b)
6
c)
1
d)
4
22.
Are the atoms more stable when they are bonded together or when they are apart?
a)
Bonded Together
b)
Apart
23.
What do atoms that form positive ions tend to do?
a)
Tend to lose electrons
b)
Tend to lose protons
c)
Tend to gain electrons
d)
Tend to gain protons
24.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
25.
Predict the bond that will form between Se and Cl.
a)
Ionic
b)
Covalent
26.
What is a valence electron?
a)
an electron that is found in the outermost shell of an atom.
b)
an electron found in the innermost shell of an atom.
c)
an electron found in the middle shell.
27.
How many valence electrons in this structure?
a)
6
b)
5
c)
4
d)
7
28.
What group would Ca like to join with
a)
5
b)
6
c)
7
d)
8
29.
What is the name of MgF2?
a)
Magnesium flouride
b)
Magnesium diflouride
c)
Magnesium flourine
d)
Madnesium triflouride
30.
What is the formula for calcium bromide?
a)
CaBr
b)
Ca2BR
c)
CaBr2
d)
Ca2BR2
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