INTEGRATED CHEMISTRY/PHYSICS
Chp. 1, pg. 26-28 (2 pts per problem) - Homework 1 (in-class) Answers
Vocabulary
2.
English System
3.
SI
8.
meter
9.
conversion factor
13.
accuracy
14.
precision
Concepts
2.
milli- means 1/1000. There are 1000 milligrams in a gram, 1000 mL in a Liter, and 1000
mm in a meter. These quantities all measure different things: mass, volume, and length.
4.
mm, cm, m, km
7.
SI conversions are based on a factor of 10. English units have their own unique
conversion. Example: 1 ft = 12 in
16 oz = 1 lb
11.
Accuracy is how close to an accepted value. Precision is how close together repeated
measurements are.
Problems
2.
nanometer, micrometer, centimeter, meter, kilometer
5.
5.2 cm. The 5 is the smallest known digit, and the 2 is estimated (digit of uncertainty).
7.
54 g x (1 kg / 1000 g) = 0.054 kg
8.
26 dm x (0.1 m / 1 dm) = 2.6 dm
9.
1200 m x (1 mm / 0.001 m) = 1,200,000 mm
10.
525 lb x (1 kg / 2.2 lb) = 239 kg