Putting it together chapters 1-4.doc - Putting it together,...

Putting it together, Chapters 1-4
1. 1.00 cm is equal to how many meters?
(a) 2.54 (b) 100. (c) 10.0 (d) 0.0100
2. 1.00 cm is equal to how many inches? 4. The number 0.0048 contains how many significant figures?
o F
o
F)
8. An object has a mass of 62 g and a volume of 4.6 mL. Its density is:
11. An empty graduated cylinder has a mass of 54.772 g. When filled with 50.0 mL of
an unknown liquid, it has a mass of 101.074 g. The density of the liquid is:
(a) 0.926 g/mL (b) 1.08 g/mL (c) 2.02 g/mL (d) 1.85 g/mL
(Calculate the mass of the liquid, and then plug into density: 101.074 g – 54.772 g
= 46.302 g. d = m / V = 46.302 g / 50.0 mL = 0.92604 g/mL)
12. The conversion factor to change grams into milligrams is: (a) 100 mg / 1 g
(b) 1 g / 100 mg (c) 1 g / 1000 mg (d) 1000 mg / 1 g .
(The idea is to introduce mg and cancel the grams. Hence, mg / g)
13. What Fahrenheit temperature is twice the Celsius temperature? (a) 64 o
(b) 320
o
F (c) 200
o
F (d) 546
F
o
F

(must do by trial an error: o C = ( o F – 32) / 1.8; 64 o F = 17.8 o C; 320 o F = 160 o C)
14. A gold alloy has a density of 12.41 g/mL and contains 75.0 % gold by mass. The
volume of this alloy that can be made from 255 g of pure gold is:
This volume contains 75% by mass gold. Thus, 8.058 mL of the alloy contains 75
g of gold. From proportion: 8.058 mL : 75 g = X: 255 g  X = 27.4 mL)