CHEM 103 107 Exam No. 1 February 3, 2017 For problems involving calculations, sh

Question

CHEM 103 107 Exam No. 1 February 3, 2017 For problems involving calculations, show all work in the spaces provided below every problem on the exam paper. Specifically, every problem requiring the full work to shown marked with an asterisk, If space is insufficient for a particular problem, you may use the back of the sheet on which the problem appears. omitting the full work on a problem will result in major deductions- .1. The density of the metallic element osmium metal is 22.59 gmLl or 22.59 g cm A cube of osmium weighs 0.3000 oz. 1 oz 283495 g. The length of a side of the cube is: a. 0.1385 mm b, 0.7221 mm c, 1.079 mm id, 1.385 mm e, 7.221 mm f 10.79 mm. g. 13.85 mm h. 72.21 mm 107.9 mm j. None of the above; the correct answer is mm *2. The temperature ofthe surface of the Sun is 5778 K. This corresponds to a temperature of 3. of the following units, the one which is not an SI base unit is the a. Ampere b, Gram c. Kelvin d. Meter e. Mole f Second

Explanation / Answer

Q1.

D = 22.59 g/mL

m = 0.3 Oz

change to grams

1 oz = 28.3495 g

0.3 oz = 0.3*28.3495 = 8.50485 g of Oz

then..

Find length side:

D = mass/volume

Volume = mass/D

V = 8.50485 g / 22.59 g /mL = 0.37648 mL

V = 0.37648 mL = 0.37648cm3

so

V of cube = L^3

0.37648 cm3 = L^3

L = (0.37648)^(1/3)

L = 0.7220 cm

to mm = 0.7220*10 = 7.22 mm

choose E

Q2.

T = 5778 K

change to °C first

T(C) = 5778-273 = 5505 °C

change C to F

F = (5505*1.8) + 32

T F = 9941 °F

Q3.

SI unit base:

Ampere, since it is actually amount of current per unit time, so it has Current (we use coulombs) and time ( we use seconds) so this is a compound

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