chm1025 final exam review, spring 2017 - teaching centerchm1025 final exam review, spring 2017 4. a...

CHM1025 Final Exam Review, Spring 2017

Name: _____________________________________ Date: _________________

1. Which of the following pairings of name : formula is incorrect?

a. Calcium Nitrate : Ca(NO3)2

b. Copper Sulfate : CuSO4

c. Lead (II) Carbonate : PbCO3

d. Sodium Perchlorate : NaClO4

e. Carbon Monoxide : CO

2. How many atoms of bromine are in 1.5g of iron (III) bromide?

a. 5.4 x 1021

b. 1.3 x 1022

c. 4.8 x 1022

d. 3.1 x 1021

e. 9.2 x 1021

3. By how many electrons does an atom get reduced in the following reaction?

Cu (s) + 2AgNO3 (aq) 2Ag (s) + Cu(NO3)2 (aq)

a. 0

b. 1

c. 2

d. 3

e. 4


4. A hot 625-g chunk of iron is plunged into 500. g of water in an insulated container. The

temperature of the water increases from 24 to 75 ºC. The specific heat capacity of the

iron is 0.45 J/gºC and the specific heat capacity of the water is 4.184 J/gºC. The initial

temperature of the iron was closest to….?

a. 380◦ C

b. 450◦ C

c. 143◦ C

d. 760◦ C

e. 286◦ C

5. Which of the following molecules will be polar?

f. H2

g. Cl2

h. CCl4

i. CO2

j. H2O

6. You run a combustion of hexane in excess oxygen. Given that you have 6 grams of

organic material, what is the percent yield given that 5.9 grams of water are produced?

a. 67%

b. 30%

c. 14%

d. 91%

e. 42%


7. The average atomic mass of strontium is calculated from two isotopes. 85Sr has a mass

of 84.91 and 90Sr has a mass of 89.93. Use the atomic mass of strontium to calculate the

abundance of 85Sr.

a. 0.54

b. 0.51

c. 0.50

d. 0.46

e. 0.41

8. A solution of sucrose in water is 68.5% sucrose by mass and has a density of 1.59 g/mL.

What mass of sucrose, in grams, is contained in 4.00 L of solution?

a. 3.5 x 103

b. 1.1 x 103

c. 3.5

d. 4.4 x 103

e. 4.5

9. If volumes are additive and 80.0 mL of 0.40 M sodium chloride is mixed with 120 mL of

a calcium chloride solution to give a new solution in which [Cl-] is 0.52 M, what is the

concentration of the calcium chloride used to make the new solution?

a. 0.60 M

b. 0.30 M


c. 0.072 M

d. 0.036 M

e. 0.52

10. The concentration of LiOH is 0.5 M. If 25mL of LiOH is needed to titrate 40 mL of

HNO3, what is the concentration of HNO3?

a. 0.03125 M

b. 0.8 M

c. 0.3125 M

d. 0.008 M

e. 1.00 M HNO3

11. The overall reaction in the commercial heat pack can be represented as

4Fe (s) + 3O2 (g) 2Fe2O3 (s) Delta H = -1652 kJ

How much heat is released (in kJ/mol) when 26 g of Fe and 4.6 g of O2 are reacted?

a. 79.16

b. 1652

c. 826

d. 0.0958

e. 158.26

12. Element M has a valence electron configuration ns1. Element X has the valence electron

configuration ns2np5. What ionic compound would most likely result from the reaction

between M and X?

a. M2X

b. MX2

c. MX

d. M3X2

e. MX3


13. Which of the following molecules is/are correctly paired with their electron

geometries?

1. NH3 – Trigonal Planar 2. CS2 – Tetrahedral 3. CF4 - Tetrahedral

a. 1, 2, and 3

b. 3 only

c. 2 and 3

d. 1 and 3

e. 1 only

14. What is the molecular formula for a compound containing 38.8% Carbon, 16.1%

Hydrogen, and 45.1% nitrogen and has a molar mass of 124.24?

a. C4N4H10

b. CNH5

c. C4N4H20

d. C3N3H15

e. C5N5H10

15. Assign functional groups to the following molecule


16. Draw out the molecule SO2 and determine if the molecule is polar or non polar and

show the bond angles.

17. You are given the following ions in solution (Mg2+, Na+, Sr2+). Which of the following

compounds can be used to successively precipitate only the strontium ions.

a. Aluminum chloride

b. Ammonium sulfate

c. Barium bromide

d. Potassium nitrate

e. Iron (II) chlorate


18. Which element does the following electron configuration refer to?

[Ar] 4s23d104p3

a. F

b. As

c. Se

d. Al

e. Si

19. Carbonic acid is supplied from the chemical companies as a 87% (m/m) solution in

water with a solution density of 1.560 g/mL. What is the concentration of the acid in

units of molarity?

f. 10.4 M

g. 13.7 M

h. 21.8 M

i. 28.6 M

j. 32.3 M

20. Determine the highest attractive force in the following compounds.

CaCl2 NH3 Br2

a. H-Bond, Dispersion, Ionic

b. Ionic, Polar, Dispersion

c. Polar, H-Bond, Dispersion

d. Ionic, H-Bond, Dispersion

e. Dispersion, Polar, H-Bond

chm1025 final exam review, spring 2017 - teaching centerchm1025 final exam review, spring 2017 4. a...

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