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CHEM113: Chemistry for the Health Sciences USEFUL INFORMATION
Brain 1 2 3 4
Period 1 . Unit conversions Math tricks 5 6 7 8 9 10 11 12 13 14 15 16 17 1B 1 km =103 m 10“ + 10lb = 10“”
1dm =102 m 1 cm =10'2m 10“
1mm =1()'a m 10b
1 mm =10'5m
1nm =10'9m = 10” 1
10-“ — — ' 10“ trillion 1012
billion 109 million 108 hundred 102

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Sample A
0.00001230 g
Sample B
Sample C
1.23 ug (where ug denotes micrograms)
1.23 mg (where mg denotes milligrams)
a) Which sample has the highest arsenic contamination? Circle one below
Sample A
Sample B
Sample C
b) Fill in the blanks to express the concentration of Sample A in scientific notation.
The concentration of Sample A in scientific notation is
c) In the space below, provide enough information to convert units. Set up a calculation to
convert Sample A's concentration into micrograms.
d) Convert Sample C's concentration to micrograms.
2. Arsenic has the chemical symbol As, and 100% of naturally found arsenic is of the isotope 75As.
Fill in the following table for different forms of arsenic.
Number of protons
|Number of electrons
Number of neutrons
As atom
As3+ ion
As5+ ion

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CHEM113: Chemistry for the Health Sciences 3. Fill in the six blanks on the following table about salts that contain arsenic. Optional: Work and thinking behind
our answer 4. Arsenic is a metalloid, so it can form covalent bonds with non-metals. The molecule shown to
the left is roxarsone (CsASNHsOa), which has been used as a feed HO...‘ II ,OH additive in chicken and pig feed. While it is banned in the European
AS Union, it is not in the US.
a) What is the molar mass of arsenic, As?
OH 0 b) Roxasone has a molar mass of 263.0365 glmol. Which contains
more arsenic, one mole of roxarsone or one mole of arsenic? Give your reasoning. 0) Which contains more arsenic, 1009 arsenic or 1009 roxasone? Give your reasoning briefly.

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5. Aluminum metal has a density of 2.70 g/cm3.
a) What is the volume of 27.00kg of aluminum? Set up a calculation below that you would
undertake to find your answer.
b) Which one of the answers below is most likely to be the answer, reported to the correct number
of significant figures? Circle your choice clearly.
0.0100 cm3
1.00x104 cm3
7.34x104 cm3
7.34x10-2 cm3
0.01000 cm3
1.000x104 cm3
7.340x104 cm3
7.340x10-2 cm3
0.010 cm3
1.0x104 cm3
7.3x104 cm3
7.3x10-2 cm3
a) Write an electron configuration for the aluminum ion (Al).
b) What is the charge on the most commonly found aluminum ion?
c) Provide an electron configuration for the ion you described in (b).

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7. Aluminum nitrate is the salt that aluminum forms with nitrate ions, N031 Set up a calculation
to determine the molar mass of the salt aluminum nitrate AI(N03)3. 8. How many grams of Na2003 are present in 12.4 mL of a solution that is 39.0% Na2003 by
mass. The density of the solution is 1.19 g/mL.

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9. For each bond drawn below, click in the box to toggle the direction of bond polarity. Leave the box blank for
a completely (4=0.0) nonpolar bond.
+ >

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10. Predict the solubility of the following substances in water and place them in the appropriate bins.
Soluble in water
Insoluble (or very low solubility)
in water
C (graphite, a nonpolar solid) NaCl (table salt, an ionic solid)
C2H5OH (a polar liquid) NO2 (a polar gas) CH4 (a nonpolar gas)
CCl4 (a nonpolar liquid)
11. Which of the following represent the Lewis structure for N?
A) . N:
B) :N:
C) N:
D) .N:
12. Choose the best Lewis structure for BeF2.
A) : F=Be=F:
D): F. -Be -F: E) : -Be=F:
13. Choose the best Lewis structure for NO3.
A) :0=N-O:
D) :O=N=O:
E) Fo

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14. How many of the following molecules are polar? PCI5 COS XeO3 SeBr2
A)2 B)0 C)1 D)3 E)4
15. Identify the number of electron groups around a molecule with a tetrahedral shape.
A) 1 B) 2 C) 3 D) 4 16. How many liters of a 0.0550 M KCI solution contain 0.163 moles of KCI? 17. What is the concentration of nitrate ions in a 0.125 M Mg(NO3)2 solution? CHEM113: Chemistry for the Health Sciences 18. How many molecules of sucrose (C12H22011. molar mass = 342.30 glmol) are contained
in 14.3 mL of 0.140 M sucrose solution? 19. Balance the chemical equation given below and determine the number of moles of iodine
that reacts with 30.0 g of aluminum. _ Al (8) + I2 (3) —’ Alzls (5)

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20. When silver nitrate reacts with barium chloride, silver chloride and barium nitrate are formed.
How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of
barium chloride?

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