Chem 1010 - General Chemistry 1 » Fall 2021 » Exam 2

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Question #1
Given the following reaction, what pressure of molecular oxygen gas at 25.0 °C in a sealed 5.10 L glass flask is required to produce 2.36 g of carbon dioxide gas? CH4 (g)  + 2 O2 (g)  →  CO2 (g)  +  2 H2O(g)
A.   0.0431 atm
B.   0.514 atm
C.   0.257 atm
D.   0.0975 atm
Question #2
To what volume should 255 mL of 0.450 M HCl be diluted to make 0.155 M HCl?
A.   0.510 L
B.   0.878 L
C.   0.740 L
D.   0.274 L
Question #3
Given the following reaction, if the percent yield was 65.0% and the actual amount made was 15.8 g, what was the theoretical amount that could be made?   2 H2 (g)  +  O2 (g)  →  2 H2O(g)
A.   10.3 g
B.   15.8 g
C.   6.5 g
D.   24.3 g
Question #4
Which of the following best describes a limiting reactant problem?
A.   When there is a fixed amount of more than one product.
B.   When there is a fixed amount of more than one reactant.
C.   When there is excess amounts of one or more reactants.
D.   None of the above apply to limiting reactant problems.
Question #5
Which of the following are true when a compound is subjected to combustion analysis?
A.   All the oxygen is converted to molecular oxygen gas.
B.   All the hydrogen is converted to molecular hydrogen gas.
C.   All the carbon is converted to carbon dioxide.
D.   All the oxygen is converted to carbon dioxide gas.
Question #6
If a gas is in a sealed container, which of the following statements is true?
A.   The higher the temperature, the greater the kinetic energy.
B.   The lower temperature, the higher the kinetic energy.
C.   The gas does not assume the volume of the container.
D.   The gas does not assume the shape of the container.
Question #7
What are the products if solid magnesium carbonate reacts with phosphoric acid?
A.     Mg3(PO4)2 (s) , CO2 (g) , and H2 (g)
B.   No Reaction Takes Place
C.   Mg3(PO4)2 (s) , CO2 (g) , and H2O(l)
D.   Mg3(PO4)2 (s)  and H2CO3 (aq)
Question #8
If CO2 gas is in a sealed 3.55 L glass flask at STP, what is the pressure if the temperature is changed to 225 °C?
A.   2.13 atm
B.   0.824 atm
C.   1.82 atm
D.   0.548 atm
Question #9
What is the net ionic equation when Ba(NO3)2 (aq) is mixed with Na2CO3 (aq)?
A.   Ba2+(aq)  +  2 NO3- (aq)­  →  Ba(NO3)2 (s)
B.   Na2+ (aq)  + (NO3-)2 (aq) →  Na2(NO3)2 (s)
C.   Ba2+(aq)  + CO32-(aq)  →  Ba2(CO3)2 (s)
D.   Ba2+(aq)  +  CO32-(aq)  →  BaCO3 (s)
Question #10
If you know the identity of a gas and the pressure, volume, and temperature, which of the following can be determined?
A.   The solubility of the gas.
B.   If it is homogeneous or heterogeneous.
C.   The number of molecules of the gas.
D.   None of the above.
Question #11
Which of the following gases has a density of 1.21 g/L at 748.6 torr and 25.0 °C?
A.   NH3
B.   Cl2
C.   CO2
D.   C2H6
Question #12
Balance the following chemical equation.  [a] NH3  +  [b] O2  →  [c] NO  + [d] H2O
A.   a= 4, b= 5, c= 4,d= 6
B.   a= 4, b= 4, c= 4,d= 5
C.   a= 4,b= 6,c= 5,d= 4
D.   a= 5, b= 5, c= 4,d= 5
Question #13
What ions are present in an aqueous solution of lithium chlorate?
A.   Li+ and ClO3-
B.   Li+ and Cl-
C.   Li+ , Cl- , and O2-
D.   None of the above.
Question #14
Given the following reaction, how many grams of AgCl are produced if 17.75 mL of 0.300 M CaCl2 are reacted?  2 AgNO3  + CaCl2  →  2 AgCl  +  Ca(NO3)2
A.   1.53
B.   15.2
C.   5.79
D.   0.765
Question #15
Which of the following is insoluble in water?
A.   (NH4)2CO3
B.   CoSO4
C.   FeCl3
D.   CuCl
Question #16
Which of the following reactions will occur?
A.   Na  +  KCl  →  NaCl  + K
B.   Cd  +  H2SO4  →  CdSO4  +  H2
C.   Zn  +  MgCl2  →  ZnCl2  +  Mg
D.   2 Ag  +  2 HNO3  →  2 AgNO3  +  H2
Question #17
Which of the following statements is true about spectator ions?
A.   Spectator ions are only on the product side of a total ionic equation
B.   Spectator ions are only on the reactant side of a total ionic equation.
C.   Spectator ions do not participate in the chemical reaction.
D.   Spectator ions limit how much product can be made.
Question #18
Given the following reaction, how many grams of water react with 109 g of P2O5?   P2O5  +  3 H­2O  →  2 H3PO4
A.   29.8
B.   23.8
C.   41.5
D.   4.61
Question #19
Given the following reaction, how many grams of NH3 are formed if 1.20 moles of H2 and 0.80 moles of N2 are reacted?    3 H2  +  N2  →  2 NH3
A.   6.18
B.   13.6
C.   34.08
D.   20.4
Question #20
Which of the following is true for an idea gas?
A.   One mole at STP occupies 22.4 L.
B.   The pressure is inversely proportional to the temperature.
C.   One gram at STP occupies 22.4 L.
D.   One mole occupies 22.4 L at 298 K
Question #21
Which statement about the reaction between large amounts of calcium nitrate and potassium carbonate in water is correct?
A.   Both CaCO3 and KNO3 will precipitate
B.   CaCO3 will precipitate
C.   KNO3 will precipitate
D.   All compounds are soluble so no reaction occurs

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