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WorksheetsP/AP Chemistry Final Exam Practice Quiz
Total questions: 46
Worksheet time: 23mins
What is the Molar Mass of MgSO4?
116.13 g/mol
272.83 g/mol
111.21 g/mol
120.37 g/mol
How many atoms are in a 591 g sample of gold?
3.00 atoms
116,000 atoms
1.81 X 1024 atoms
3.60 X 1025 atoms
How many atoms are in a sample containing 4.000 moles of carbon?
6.022 X 1023 atoms
2.408 X 1024 atoms
7.233 X 1024 atoms
2.893 X 1025 atoms
Calculate the number of molecules present in .20 moles of H2O.
2.9 X 1025 molecules
5.1 X 1022 molecules
1.2 X 1023 molecules
2.4 X 1023 molecules
How many atoms of NaCl are present in 11.0 moles?
58 atoms
642 atoms
6.62 X 1024 atoms
3.51 X 1025 atoms
What is the percent composition of carbon in compound benzene (C6H6) to two significant digits?
8% carbon
17% carbon
50% carbon
92% carbon
The molecular formula for butane is C4H10. Determine the percent composition for each element in the compound.
25.00% C, 18.90% O
40.00% C, 60.00% O
82.70% C, 17.30% H
92.30% C, 7.70% H
The molecular formula for phosphorous pentoxide is P4O10. What is its empirical formula?
PO2.5
P0.4O
P2O8
P2O5
The empirical formula for perchloric acid is HClO4. Which compound could represent the molecular formula for perchloric acid?
H4Cl4O12
H2Cl2O6
H3Cl3O12
HClO8
Determine the molecular formula with an empirical formula of NH2 and a molar mass of 32
N2H3
N2H4
NH3
N3H3
In the reaction N2+3H2--> 2NH3, what is the mole ratio of hydrogen to nitrogen?
1:1
1:2
3:1
3:2
Calcium hydroxide and hydrochloric acid react to form calcium chloride and water as shown in the chemical reaction. If the chemicals are present in exactly the correct ratios to fully use all of the ingredients, how many moles of water (H2O) would be formed from 5 moles of HCL? (Hint: you have to balance the equation first.)
1Ca(OH)2+2HCl ---> 1CaCl2+2H2O
1 mole
2 moles
5 moles
10 moles
A student has a 5.00 gram sample of calcium chloride (CaCl2) solid. How many moles of calcium chloride are contained in this sample?
378 moles of CaCl2
22 moles of CaCl2
555 moles of CaCl2
0.0455 moles of CaCl2
3CaCl2(aq) + 2Na3(PO4)(aq) -----> Ca3(PO4)2(s) + 6NaCl(aq)
Use the balanced equation and the Molar Mass table above to answer the following question.
Suppose 163.9g of Na3(PO4) in solution mixed with sufficient CaCl2 in solution yields 116 g of Ca3(PO4)2(s). What is the percent yield of Ca3(PO4)2(s)?
141%
74.8%
70.8%
50.0%
In 1860, Robert Boyle was the first to use phosphorous to ignite sulfur-tipped wooden splints that gave rise to our modern matches. One of the ways it can be made involves the chemical reaction of calcium phosphate with carbon and silicon dioxide in a furnace:
2Ca3(PO4)2 + 6SiO2 + 10C ---> 6CaSiO3 + P4 + 10CO
Refer to the information above. If you use 100.0 grams of calcium phosphate (Ca3(PO4)2 and an excess of silicon dioxide and carbon, how many moles of phosphorous (P4) will be produced?
.1612 moles
.3226 moles
15510 moles
1.551 moles
Students held a four-mole strip of magnesium over a flame until a combustion began. Students were provided the balanced chemical reaction for the combustion of magnesium and asked to describe the limiting reactant
2Mg+O2 ----> 2MgO
Which student correctly describes the limiting reactant?
Student 1
Student 2
Student 3
Student 4
In a closed system, equal amounts of ammonia and oxygen react to produce nitrogen monoxide and water. What is the limiting reactant?
4NH3 + 5O2 ---> 4NO + 6H2O
NH3
O2
NO
H2O
The equation demonstrates a reaction of sodium chloride and fluorine.
2NaCL + F2 -----> 2NaF + Cl2
In order for the reaction to proceed, for every two moles of sodium chloride, there must be at least how many mole(s) of fluorine?
1 mole
2 moles
3 moles
4 moles
A model of a chemical reaction is shown.
Which substance is the limiting reagent in the chemical reaction?
Substance A
Substance B
Substance C
Substance D
A Scientist fills a large, tightly sealed balloon with 75,000 mL of helium at STP. Using the Ideal Gas Law, calculate how many moles of helium are contained within the balloon?
.3334 moles of helium
3,348 moles of helium
18 moles of helium
3.348 moles of helium
What is the new pressure of 150 mL of a gas that is compressed to 50 mL when the original pressure was 3.0 atm and the temperature is held constant?
100 atm
0.90 atm
1.0 atm
9.0 atm
The volume of a gas is 50.0 mL at 20.0 K. What will be the new temperature if the gas is compressed to 10.0 mL under constant pressure?
100 K
10.0 K
4.00 K
5.00 K
Using the Ideal gas Law, calculate the approximate volume of a 1.50 mol sample of gas at 15.0oC and a pressure of 3.75 atm
1.73 L
5.93 L
9.46 L
8.65 L
235mL of a gas has a pressure of 765 torr at a temperature of 21oC. Which of the following has all the units in the correct Standard International Units of Gases (SI units)
235 L ; 1 atm ; 252 K
.235 L ; 1.01 atm ; 294 K
23.5 L ; .968 atm ; 296 K
.0235 L ; 1.6 atm ; 300 K
A solution that contains the maximum amount of solute that is soluble at a given temperature is said to be --
unsaturated
saturated
supersaturated
diluted
A solution in which more solute is dissolved than is typically soluble at a given temperature is --
unsaturated
saturated
supersaturated
diluted
A sample of 0.0255 mol potassium hydroxide, KOH, was dissolved in water to yield 10.0 mL of solution. What is the molarity of the solution?
2.55 M
2.55 X 10-3 M
392 M
0.392 M
What is the molarity of a 9.79 L solution that contains 0.400 mol HCL?
0.0133 M
0.0409 M
0.959 M
5.67 M
What volume of 2.5M NaOH solution contains 3.25 mol of NaOH?
0.098 L
0.575 L
1.30 L
1.45 L
To make 2.00 L of 0.300 M sulfuric acid, how many mL of a 1.00 M stock solution should be used?
1.50 X 102 mL
6.00 X 102 mL
6.67 X 102 mL
1.50 X 103 mL
Beginning with a stock solution of hydrochloric acid, 1.00 X 102 mL of a 12.4 M HCL is added to water to bring the total volume of the solution to 0.820 L. What is the concentration of this new solution?
1.02 M
1.51 M
6.60 M
10.2 M
In Flint, Michigan, toxic lead metal was found in the water and it needs to be filtered out in order for the city to have clean and safe drinking water. A company is proposing a solution where they mix negative ions into the water to bond with the Pb+2 ions and form an insoluble solid that can be filtered out.
Which of the following compounds contains ions that could be used in order to form a precipitate with lead?
NaNO3
K2SO4
HC2H3O2
NaClO2
A live electrical wire used for transporting electricity breaks in a residential neighborhood, and the frayed end drops into a puddle of water containing some dissolved substances.
Which of the following substances would conduct and potentially cause a nearby person to be electrocuted by the shock?
C2H5OH
C6H12O6
Fe2O3
H2SO4
Which of the following is insoluble?
Potassium Chromate
Ammonium Carbonate
Lead II Iodide
Sodium phosphate
Aqueous Lithium Carbonate (Li2CO3) and Aqueous Aluminum nitrate (Al(NO3)3) are mixed together. Which of the following equations is the correct balanced equation that the reaction forms a precipitate (solid) , or does not.
3Li3CO3 (aq) + 2Al(NO3)3 (aq) ----->
Li2CO3 (aq) + Al(NO3)3 (aq) ---> Li(NO3)3 (aq) + AlCO3 (s)
3Li2CO3 (aq) + 2Al(NO3)3 (aq) ---> 6LiNO3 (aq) + Al2(CO3)3 (s)
Li2CO3 (aq) + Al(NO3)3 (aq) ---> 3LiNO3 (aq) + Al2(CO3)3 (aq)
Li2CO3 (aq) + 2Al(NO3)3 (aq) ----> Li(NO3)3 (aq) + 2AlCO3
For two acids of equal concentration, the stronger acid has --
a higher concentration of hydroxide ions
a higher pH
a higher concentration of hydronium ions
a stronger bond
A researcher is trying to conduct an experiment that requires a solution with a high concentration of hydronium ions. There are several solutions in the stock room they can choose from, which includes two bottles of hydrochloric acid and two bottles of acetic acid with varying molarities. Hydrochloric acid is a strong acid, and acetic acid is a weak acid.
Which of the following solutions would have the highest concentration of hydronium ion (H3O+)?
1.0 X 10-3 M HCl
1.0 X 10-3 M HC2H3O2
0.050 M HCl
0.050 M HC2H3O2
Potassium hydroxide, also known as lye, dissociates into metal and hydroxide ions in water. The resulting solution is caustic and used for industrial purposes. What describes the dissociated solution?
Strong base
Weak acid
Weak base
Strong acid
What is the pH of a solution with a hydrogen ion concentration of 1.3 X 10-11?
11.1
10.9
1.3
0.11
A solution has a pOH of 9.74. Is the solution an acid or base?
An Acid
A Base
A solution has a pOH of 11.5. What is the [OH-] concentration?
3.16 X 10-12
3.16 X 1011
-.499
1.06
A solution has a pH of 4.5. What is the [OH-] concentration?
3.16 X 10-10
3.16 X 109
-.977
1.06
How do you know if a titration of HCl with NaOH with an phenyolpthalien indicator is done correctly?
If you swirl the flask or beaker and the color of the solution is a fluorescent pink
If you swirl the flask and the liquid stays clear
If you add more titrand and the solution turns a dark pink
If the solution maintains a icy pink color
Which of the following is the conjugate base in the reaction below?
OH- + HCN --> H2O + CN-
HCN
H2O
CN-
OH-
Predict the missing product in the acid-base reaction.
HCl + NaOH --> H2O + _______
HNa
ClOH
NaCl
CO2
Predict the Products and balance the following acid-base neutralization reaction.
2HNO3(aq) + 1Ca(OH)2(aq) -->
2HNO3(aq) + 2Ca(OH)2(aq) --> H2O(l) + 2Ca(NO3)2
HNO3(aq) + Ca(OH)2(aq) --> H2O(l) + Ca(NO3)2
2HNO3(aq) + _Ca(OH)2(aq) --> 2H2O(l) + Ca(NO3)2 (aq)
HNO3(aq) + 2Ca(OH)2(aq) --> 2H2O(l) + Ca(NO3)2 (aq)
