NEW
Font size
WorksheetsAP Chem Unit 4
Total questions: 25
Worksheet time: 56mins
Which of the following reactions could be modeled using the following representation?
AgCl --> Ag+ + Cl-
AgNO3 + NaCl --> AgCl + NaNO3
AgCl + K --> Ag + KCl
Ag+ + e- --> Ag
Which of the following statements BEST describes the difference between the two equations shown below?
Equation 1: H2O (l) --> H2O(g)
Equation 2: 2H2O (l) --> 2H2(g) + O2(g)
Equation 1 represents a physical change because intermolecular forces are broken during the process, whereas Equation 2 represents a chemical change because intramolecular forces are broken
Equation 1 represents a physical change because intramolecular forces are broken during the process, whereas Equation 2 represents a chemical change because intermolecular forces are broken
Equation 1 represents a chemical change because intermolecular forces are broken during the process, whereas Equation 2 represents a physical change because intramolecular forces are broken
Equation 1 represents a chemical change because intramolecular forces are broken during the process, whereas Equation 2 represents a physical change because intermolecular forces are broken
You mixed two aqueous solutions together, expecting to see a precipitate form. Instead, after several minutes, you do not SEE any changes.
Which of the following are other observations that could be recorded?
gas bubbling
heat evolving
color change
there are no other changes to look for because no reaction has occurred
Use the diagram below to help you.
Which of the following BEST describes what happens to C2H4 when a 5.00 g sample of C4H6 is mixed with a 10.00 g sample of C6H6 at -10.0°C?
A chemical change occurs, and the C4H6 forms nonpolar covalent bonds with the C6H6
A physical change occurs, and the C4H6 forms a thin, liquid layer above the liquid C6H6
A chemical change occurs, as the C4H6 bonds are broken, and the individual C and H atoms are added to the C6H6 molecule to form C10H12
A physical change occurs as the C4H6 forms London dispersion forces with the C6H6 to create a mixture.
Solutions of sodium carbonate and hydrochloric acid are mixed. Which of the following represents the balanced, net ionic reaction for this mixture?
Na2CO3 (aq) + 2HCl (aq) --> 2NaCl(aq) + H2CO3(aq)
CO32-(aq) + 2H+(aq) --> H2CO3(aq)
CO32-(aq) + 2H+(aq) --> H2O(l) + CO2(g)
2Na+ (aq) + CO32-(aq) + 2H+(aq) + 2Cl-(aq) --> 2Na+ (aq) + 2Cl-(aq) + H2O(l) + CO2(g)
Reactions occurring in aqueous solution can be represented by three types of reaction equations: (1) a molecular equation, (2) a complete ionic equation, and (3) a net ionic equation. Sometimes, two of more of these wind up looking exactly the same.
Consider the reaction below:
Mg(OH)2(aq) + H2SO4(aq)--> MgSO4(s) + 2H2O(l)
Which of the following statements is TRUE concerning the molecular equation (shown above), the complete ionic equation and the net ionic equation for this reaction?
All three equation types are the same
All three equation types are different
The molecular and complete ionic equations are the same, but the net ionic equation is different.
The molecular equation is different from the other two, but the complete ionic and net ionic equations are the same.
Consider the decomposition reaction represented in the picture. Which of the following reaction equations would fit this decomposition?
KClO3 --> KCl + 3O2
Mg(ClO3)2 --> MgCl2 + 3O2
Mg(ClO3)2 --> MgO2 + 3Cl2
Pb(CO3)2 --> PbO2 + 3CO2
Consider the reaction:
2ZnS + 3O2 --> 2ZnO + 2SO2
This reaction has an 80.0% yield.
What mass of ZnO is produced when 50.0 g of ZnS is heated in an open vessel until no further weight loss is observed?
33.4 g
40.4 g
43.4 g
3240 g
Calcium reacts with water according to the following reaction:
Ca + 2H2O --> Ca(OH)2 + H2
What volume of hydrogen gas, at 2.00 atm and 0.00°C, is produced from 20.0 g calcium and 20.0 g water?
0.559 L
5.46 L
109 L
219 L
For a titration using 12.00 mL of 0.50 M HCl and NaOH, which of the following is TRUE about the equivalence point?
1.5 mL of 2.0 M NaOH has been added
24.00 mL of 1.0 M NaOH has been added
12.00 mL of 1.0 M NaOH has been added
6.00 mL of 1.0 M NaOH has been added
There are two 25.0 mL unmarked samples. One is HCl and the other is HF. Given 0.200 M KOH, you titrate each sample separately to determine the equivalence point.
Which of the following would assist in identifying the samples?
The equivalence point for HCl would be found at pH<7, while the equivalence point for HF would be found at pH=7
The equivalence point for HCl would be found at pH>7, while the equivalence point for HF would be found at pH<7
The equivalence point for HCl would be found at pH=7, while the equivalence point for HF would be found at pH<7
The equivalence point for HCl would be found at pH=7, while the equivalence point for HF would be found at pH>7
Which of the following is an accurate description of the equivalence point for any strong acid-strong base titration?
The moles of acid is equal to half the amount of base
The acid has been oxidized and the base has been reduced
The acid has been completely reacted, and the pH of the solution is equal to 7
The pH of the final solution is greater than 11 since the strong base is being used to neutralize a strong acid
A sample of 25.0 mL of 0.120 M Ba(OH)2 is titrated with 0.150 M HBr.
What volume of hydrobromic acid is needed to completely neutralize the barium hydroxide?
20.0 mL
40.0 mL
60.0 mL
80.0 mL
A student added 2 mL of 0.1 M CaCl2 to 2 mL of 0.1 M Na2CO3 in a test tube. He observed a white precipitate form. Which of the following is the identity of the precipitate?
CaCl2
Na2CO3
NaCl
CaCO3
In which of the following substances does manganese have the highest oxidation number?
LiMnO4
K2MnO4
MnO2
Mn(NO3)2
Which of the following is an oxidation-reduction reaction?
CuCl2(aq) + Fe(s) --> FeCl2(aq) + Cu(s)
Pb(NO3)2(aq) + 2NaI(aq) --> PbI2(s) + 2NaNO3(aq)
HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l)
NH4Cl --> NH3 + HCl
Which of the following represents the oxidation half-reaction for the unbalanced redox equation?
Cu + HNO3 --> Cu(NO3)2 + NO2
Cu2+ + 2e- --> Cu
Cu --> Cu2++2e-
NO3- --> NO2 + e-
2H+ + NO3- + e- --> NO2 + H2O
A student performs a gravimetric analysis of an unknown alkali metal bromide solution by mixing the unknown with excess silver nitrate solution. The student collects the resulting silver bromide precipitate through filtration, dries it, and records the mass of the precipitate.
During the course of the experiment, which of the following happens to the nitrate ions?
The nitrate ions react with the unknown metal ions and are decomposed
The nitrate ions are oxidized by the bromide ions
The nitrate ions react with the unknown metal ions, creating a solid product
The nitrate ions remain dissolved in the filtrate
10.0 mL of a 0.10 M sodium chloride solution is mixed with 10.0 mL of 0.25 M silver nitrate solution.
What mass of silver chloride should form from this reaction?
0.014 g
0.14 g
0.24 g
0.32 g
Which of the following is the conjugate acid of HPO4-2?
H2PO4-
PO4-3
H3PO4
H3O+
H2O is considered an amphoteric substance. Which of the following other substances can also be considered amphoteric?
H2SO4
HSO4-
SO42-
CO32-
Which of the following is the conjugate base in this reaction?
H2S(g) + H2O(l) <->H3O+(aq) + HS-(aq)
H2S
H2O
H3O+
HS-
Which of the following is the correct half-reaction for the reduction of hydrogen when a piece of Al wire is added to a solution of HCl?
2H+(aq)+ 2e- --> H2(g)
6H+(aq) + 6e- --> 3H2(g)
2H+(aq) --> 2H+2 + e-
2H2(g) --> 6H+(aq) + 6e-
The two unbalanced half-reactions below represent the oxidation-reduction reaction that occurs when solid Cu is added to Ag ion solution.
Which of the following accurately describes the number of electrons transferred during the reaction?
Cu--> Cu2+
Ag+ --> Ag
1 electron. The charge on the Ag+ is +1 so the silver ion is reduced by gaining an electron
2 electrons. When the balanced equation is written, there are two Ag+ to balance the charge with the Cu2+
3 electrons. Since the charge on the Cu2+ is +2 and the charge on the Ag+ is +1, the total charge is +3
1 mole of electrons. During a redox reaction, there is always a mole of electrons transferred.
A 15.0 g sample of lithium is reacted with 15.0 g of flourine to form lithium flouride:
2Li + F2 --> 2LiF
After the reaction is complete, which of the following will be present?
2.16 moles LiF only
0.789 moles LiF only
2.16 moles LiF and 0.395 moles F2
0.789 moles LiF and 1.37 moles Li
