Exam Review

1
Exam Review

• Keep on working!!

2
Questions

• Question 1
• Question 2
• Question 3
• Question 4
• Question 5
• Question 6
• Question 7
• Question 8
• Question 9
• Question 10
• Question 11
• Question 12

• Question 13
• Question 14
• Question 15
• Question 16
• Question 17
• Question 18
• Question 19
• Question 20
• Question 21
• Question 22
• Question 23
• Question 24
• Question 25

3
Correct

• Charles says that you did great!!
• Next Question

4
Try Again!

• Edna says to check your notes to help you out!

5
Question 1

• A compound was analyzed and found to contain
  76.57 carbon, 6.43 hydrogen, and 17.00 oxygen
  by mass. Calculate the empirical formula of the
  compound. If the molar mass of the compound is
  94.11g/mol, what is the molecular formula of the
  compound?
• A. C6H6O CHO B. CHO C6H6O
• C. C6 H6O C6H6O D. CHO CHO

6
Question 2

• A compound was analyzed and found to contain
  53.30 carbon, 11.19 hydrogen, and 35.51 oxygen
  by mass. Calculate the empirical formula of the
  compound. If the molar mass of the compound is
  360.48 g/mol, what is the molecular formula of
  the compound?
• A. C2H3O2C4H6O4 B.C2H5O C2H5O
• C. C16H40O8 D. C2H5O C16H40O8

7
Question 3

• Consider this balanced equation
• 3 H2(g) CO(g) ? CH4(g) H2O(g)
• How many moles of CH4 can be obtained by reacting
  2.0 mol of H2 with 2.0 mol CO according to this
  equation?
• (A) 0.33 mol (C) 2.0 mol(B) 0.67 mol (D) 3.0 mol

8
Question 4

• Antimony reacts with sulfur according to this
  equation.
• 2Sb(s) 3S(s) ? Sb2S3(s)
• The molar mass of Sb2S3 is 339.7 g mol-1
• What is the percentage yield for a reaction in
  which 1.40 g of Sb2S3 is obtained from 1.73 g of
  antimony and a slight excess of sulfur?
• (A) 80.9 (C) 40.5(B) 58.0 (D) 29.0

9
Question 5

• The limiting reagent in a particular reaction can
  be recognized because it is the reagent.
• (A) with the smallest coefficient in the
  balanced equation.(B) that has the lowest mass
  in the reaction mixture.(C) that is present in
  the smallest molar quantity.(D) that would be
  used up first.

10
Question 6

• A student wants to prepare 250. mL of 0.10 M NaCl
  solution. Which procedure is most appropriate?
  (The molar mass of NaCl is 58.4 g mol-1)
• (A) Add 5.84 g of NaCl to 250. mL of H2O(B) Add
  1.46 g of NaCl to 250. mL of H2O(C) Dissolve
  5.84 g of NaCl in 50 mL of H2O and dilute to 250.
  mL.(D) Dissolve 1.46 g of NaCl in 50 mL of H2O
  and dilute to 250. mL.

11
Question 7

• What volume of 0.15 M HCl can be made from 7.5 mL
  of concentrated HCl (12M)?
• (A) 0.060 L (C) 6.0 L(B) 0.60 L (D) 6.0 x 102 L

12
Question 8

• For the reaction
• 2MnO2 4KOH O2 Cl2 ?2KMnO4 2KCl 2H2O
• there is 100. g of each reactant available.
  Which reagent is the limiting reagent?
• Molar Masses MnO286.9 KOH56.1 O232.0
  Cl270.9
• a) MnO2 c) O2
• b) KOH d) Cl2

13
Question 9

• Compounds with the same molecular formulas but
  different structural formulas are called
• a) isotopes c) isomers
• b) variations d) conformations

14
Question 10

• Which of the following molecular shapes has four
  atoms joined to a central atom?
• a) linear c) trigonal bipyramid
• b) tetrahedral d) octahedral

15
Question 11

• What is the geometrical arrangement of electron
  pairs in H2O?
• a) Linear c) trigonal bipyramidal
• b) bent d) octahedral

16
Question 12

• A 31.0 mL sample of gas is collected at a
  temperature of 37 C and pressure of 720 mmHg.
  What is its volume at 17 C and 580 mmHg.
• a) 23 mL d) 41 mL
• b) 27 mL e) 58 mL
• c) 36 mL

17
Question 13

• A sample of gas occupies 30.0 L at 0.800 atm and
  298 K. How many moles of gas are in the sample?
• 22.4 b) 0.981
• 1.02 d) 2.23
• e) none of these

18
Question 14

• Which statement best explains why a confined gas
  exerts pressure?
• a) the molecules are in random motion
• b) the molecules travel in straight lines
• c) the molecules attract each other
• d) the molecules collide with the container walls

19
Question 15

• CH4 gas and O2 gas are together in a container.
  Which statement correctly describes the
  velocities of the two molecules.
• a) The two molecules have the same average
  velocity.
• b) The CH4 is moving twice as fast as the O2.
• c) The CH4 is moving faster, but not twice as
  fast as the O2.
• d) The O2 is moving faster than the CH4.

20
Question 16

• Which quantum number determines the subshell
  occupied by an electron (s, p, d, f, etc.)?
• a) n c) ml
• b) l d) ms

21
Question 17

• Which of the following sets of quantum numbers is
  possible for a 3d electron?
• a) n 3, l 3, ml 2, ms
• b) n 2, l 1, ml 1, ms
• c) n 3, l 1, ml 0, ms
• d) n 3, l 2, ml 2, ms
• e) n 4, l 1, ml 1, ms

22
Question 18

• The correct electron configuration for nitrogen
  is
• a) 1s2 2s2 2p6 3s2 3p2
• b) 1s2 2s2 2p6 2d4
• c) 1s2 2s2 2p3
• d) 1s2 2s2 3s2 4s1
• e) 1s2 1p5

23
Question 19

• Which of the following distributions of electrons
  is correct for three electrons in p-subshell?
• a)?? ?
• b)?? ?
• c)?? ?
• d)?? ?

24
Question 20

• The electron configuration of the indicated atom
  in the ground state is correctly written for
  which atom?
• a) Ga Ar 3d12 4s2
• b) Ni Ar 3d10
• c) Ni Ar 3s2 3p8
• d) Cu Ar 3d10 4s1

25
Question 21

• Which of the following is likely to have the
  largest atomic radius?
• a) H b) Mn c) Rb d) Ag

26
Question 22

• Which of the following has the greatest
  ionization energy?
• a) K b) Ca c) Fe d) Br

27
Question 23

• What is the pH of a 8.34 x 10-4 M NaOH?
• A. 3.08 B. 4.00
• C. 10.00 D. 10.92

28
Question 24

• What is the molarity of a 25.00 mL HCl solution
  that has been titrated with 17.27 ml of 0.875 M
  NaOH?
• A. 1.25 M B. 0.302 M
• C. 0.875 M D. 0.604 M

29
Question 25Last one!

• How many liters of nitrogen dioxide will be
  collected when 1.50 moles are heated to 30.0 C
  and a pressure of 0.987 atm?
• A. 37.8 L B. 38.9 L
• C. 3.78 L D. 0.0265 L