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WorksheetsChemistry Final Exam
Total questions: 50
Worksheet time: 50mins
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
Reactant
Product
Yields
Chemical Reaction
The reaction below is a Bronsted-Lowry acid-base reaction.
HSO4−−(aq) + NH3(g) → NH4+ (aq) + SO4−2(aq)
Which statement best describes the action of NH3(g) in the reaction?
It acts as a base because it is a proton donor.
It acts as a base because it is a proton acceptor.
It acts as an acid because it is a proton donor.
It acts as an acid because it is a proton acceptor.
Which of the following solutions is the most acidic?
[OH] = 1 x 10−13 M
[OH] = 1 x 10−4M
[H3O+] = 1 x 10−11 M
[H3O] = 1 x 10−2 M
Which substance can be classified as an Arrhenius acid?
KOH
LiH
HF
KF
What is the molarity of a solution containing 20 grams of NaOH in 0.50 liter of solution?
0.50 M
2.0 M
1.0 M
10 M
A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass. What is the empirical formula of this compound?
CaCO3
CaC3O6
CaC2O4
CaCO2
How many moles of tungsten atoms are in 4.8 x1025 atoms of tungsten?
1.3 x 10−2moles
8.0 x 102moles
8.17 x 10-17moles
1.3 x 10−1 moles
Chemistry is the study of......
Bio-chemicals
matter and its interaction with the envioronment
Explosions
None of the above
The numbers in front of the reactants and the products after we balance the chemical equation is called
Subscript
Coefficient
Molecules
None of the above
The molecular formula is the
dividend of the Empirical formula
addition of the Empirical formula
multiple of the Empirical formula.
none of the above.
11 moles of NH3 reacts with 8.25moles of O2 to produce
16.5 moles of H2O
11 moles of NH3
8.5 moles of O2
None of the above
The molecular formula of CF2 with molar mass of 200g is
C4F7
C2F8
C4F8
none of the above
Identify each type of reaction:
Na3 (PO4) + 3 KOH --------> 3 NaOH + K3 (PO4)
MgCl2 + Li2(CO3) ----------> Mg(CO3) + 2LiCl
C6H12 + 9O2 -------> 6CO2 + 6 H2O
Double displacement , single displacement, combustion
Combustion, combination, double displacement
Double displacement, double displacement and combustion
None of the above
The formula to find the percent composition of a compound.
Mass %= mass of element / moles x 100
Mass % = mass of element
--------------------- x 100
mass of compound
mass % = mass of compound / 100
None of the above
The formula to find the percent composition of a compound.
45 g
39.10 g
94 g
78.20g
Balance the following chemical Equation:
----- FeCl3 + ------ O2 --------> ------- Fe2O3 + ------ Cl2
4 FeCl3 + 3 O2 --------> 2 Fe2O3 + 6 Cl2
FeCl3 + O2 --------> Fe2O3 + Cl2
FeCl3 + 2 O2 --------> 3 Fe2O3 + 6 Cl2
2 FeCl3 + O2 --------> 3 Fe2O3 + Cl2
Calculate the molar mass for Al(OH)3
78.0 g/mol
72 g/mol
28 g/mol
32 g/mol
What is the empirical formula of a compound that contains 40% sulfur and 60% oxygen by mass?
SO
SO2
S2O3
SO3
Which of the following is a strong acid?
H2SO4
CH3COOH
H2CO3
H3PO4
What is the molar mass of Na2CO3?
106 g/mol
84 g/mol
58.5 g/mol
44 g/mol
Strong bases have a pH of?
0-3
4-6
7-9
10-14
One mole is equal to ................................which is called the Avogrados number
6.02 x 1025
6.02 x 10 24
6.02 x 1023
None of the above
What is the name of the element in Group 3 Period 4?
potassium
Phosphorous
Nitrogen
Scandium
A Bronsted Lowry acid:
donates H+ to another substance
accepts H+ from another substance
produces H+
produces OH-
HSO4- + H2O → H3O+ +SO42-
Identify the Bronsted Lowry Acid in the above reaction.
HSO4-
H3O+
SO42-
H2O
What does pH measure?
the amount of hydrogen (H+) ions
amount of water
amount of hydroxide (OH-) ions
all of the above
A Bronsted Lowry base:
donates H+ to another substance
accepts H+ from another substance
produces H+
produces OH-
What is the molar mass of UF6?
101 g/mol
238 g/mol
257 g/mol
352 g/mol
Calculate the molar mass of Ba(C2H3O2)2
255.3 g/mol
237.3 g/mol
228.3 g/mol
196.3 g/mol
Balance the following equation with the correct coefficients: P4+O2 → _P2O3
3 P4+1 O2 → 2 P2O3
3 P4+1 O2 → 2 P2O3
1 P4+ 3 O2 → 2 P2O3
1 P4+1 O2 → 2 P2O3
Balance the following equation with the best coefficients:
AgNO3 + Cu →_Cu(NO3)2 + _Ag
2 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 1 Ag
1 AgNO3 + 2 Cu → 2 Cu(NO3)2 + 1 Ag
3 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 2 Ag
2 AgNO3 + 1 Cu → 1 Cu(NO3)2 + 2 Ag
A solution is
a mixture of two or more substances of the same state (e.g., liquid + liquid)
a mixture of two or more substance. It is heterogeneous at the molecular level.
a mixture of two or more substances. It is homogeneous at the molecular level.
a mixture of two or more substances, one of which is water.
The pH scale is a range from:
1-7
0-14
1-5
1-20
In a double replacement, ____________________
The reactants are usually a metal and a nonmetal
One of the reactants is often water
The reactants are generally 2 ionic compounds in aqueous solutions
Energy in the form of light or heat is often produced
Chemical equations must be balanced to satisfy ____.
The law of definite proportions
The law of multiple proportions
The law of conservation of mass
Avogadro's principle
What are the coefficients that will balance the skeleton equation below?
AlCl3 + NaOH → Al(OH)3 + NaCl
1,3,1,3
3,1,3,1
1,1,1,3
1,3,3,1
How many moles of aluminum are needed to react completely with 1.2 mol of FeO?
2Al(s) + 3FeO(s) → 3Fe(s) + Al2O3(s)
1.2 mol
0.8 mol
1.6 mol
2.4 mol
Substances that are the result of a chemical change is ................... .
reactant
reaction
product
H2O
AX ⟹ A + X , is an example of ______ .
Combustion reaction
Decomposition reaction
Synthesis reaction
None of them
Which answer is an example of a chemical change?
Boiling water
rusting iron
dissolving powder
freezing water
Which answer is an example of a physical change?
freezing water
burning coal
rusting iron
baking a cake
What does pH measure?
the amount of hydrogen (H+) ions
the amount of hydroxide (OH-) ions
amount of water
all of the above
What is the molar mass of MgF2?
62.31 g/mol
67.62 g/mol
43.31 g/mol
86.62 g/mol
What is the molar mass of NaCl?
49.46 g/mol
58.44 g/mol
152.92 g/mol
161.90 g/mol
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
SO
SO2
SO3
SO4
