CHAPTER 1 PROBLEM SET NAME______
1. 175 kg = ______g (obj 16)
2. 93 l = ______ml (obj. 16)
3. The length of a rectangle is measured as 14.3 +/- .3 cm and its width is measured as 78 +/- 2 mm. What is the perimeter of the rectangle and the area. Include the uncertainty and units in each calculation, if necessary. Show all work neatly below.
(obj 6,7)
perimeter = ______area = ______
4. The measurements of a rectangular bar are given as follows:
.0428 +/- .0002 m
.0070 +/- .0002 m
.0006 +/- .0002 m
What is the volume of the bar? Show all work neatly. Do you use sig figs or uncertainty in your answer???
Do you need units??? (obj. 6,7)
volume______
5. An empty beaker was weighed and showed a mass of 110.2 +/- .1 g. When a liquid was added it was reweighed but on a
different balance and had a mass of 330.2 +/- .5 g. What was the mass of the liquid? Show all work neatly!!! (obj. 6)
mass of liquid = ______
-over-
6. Density is defined as mass per unit volume (density = mass/volume). If the mass of an object is 2.5 +/- .1 g and the volume is 93 +/- 1 ml, what is the density of the object? Show all work neatly. (obj. 6)
Density = ______
7. The area of a rectangle is 7.5 x 106 cm2 and the width is 1.5 x 10-1m. What is the length of the rectangle?
Show work neatly. (obj. 6)
length = ______
QUESTIONS 8-9 CONVERT THE GIVEN QUANTITIES INTO SCIENTIFIC NOTATION: (obj. 17)
8. 97,943,000 g = ______
9. .000724 sec = ______
For questions 10-13 properly round using either sig. figs. or least accurate column. (obj. 6)
10. 4050.8 g 11. 76534.9 g
- 2.097 g 8.635 g
+ 541. g
12. 50 mm x 11.5 mm x 3.5 mm = ______
13. 690 cm2
6.000 cm = ______
14. A substance melts and freezes sharply at 6.25°C. Is this material a mixture or a pure substance? (obj. 4)
______
15. What is meant by a phase change for a substance? (obj. 12)
-over-
16. Given the following table of melting and boiling points of various substances, list at least 2 regularities shown in the data.
(obj. 1)
SUBSTANCE MELTING PT (°C) BOILING PT (°C)
1. copper metal 1083 2583
2. silver metal 961 2193
3. iron metal 1535 2800
4. moth balls 53 175
5. sugar 112 ----
6. water 0 100
7. wax 53-55 282
note-- substances 4-7 are nonmetals
REGULARITIES:
1.
2.
17. The accepted value for the melting point of an unknown substance is 77.5 +/- .2°C.
A) Which of the following substances could be the unknown? (obj. 4)
substance A = 77.3 +/- .2°C
substance B = 77.7 +/- .1°C
substance C = 78.0 +/- .5°C
substance D = 76.9 +/- .4°C
substance(s) ______
B) If the unknown melting point had been 77.5 +/- .1°C which of the substances could be the unknown? (obj. 4)
substance(s) ______