Blanchard
Chem Ben 1201
Dr. Gilman
Chapter 1.5: Uncertainty In Measurement
Precision and Accuracy
Precision is the ability to__________________________
a. hit the target in a small cluster
b. hit what you aimed for
c. hit the target
Accuracy is the ability to___________________________
a. hit the target in a small cluster
b. hit what you aimed for
c. hit the target
Accurate?: Yes / No
Accurate?: Yes / No
Accurate?: Yes / No
Precise?:
Precise?:
Precise?:
Yes / No
Yes / No
Sig Figs
Count the number of sig figs in each of the following:
0.00089=
103=
1.030=
Add the following with the correct amount of sig figs
(6.2)(13.9972) =
12.2293 +14 =
Yes / No
Scientific Notation: When using scientific notation you generally allow the given
number to have one digit before the decimal. Ex: 1.2
When using larger numbers, you will need to round and use a 10^x your in answer
How can 1295 be written in scientific notation? ___________________________
Temperature: When using temperature in calculations always use Kelvins!!!
Temperature in degrees Celsius is equal to Kelvins plus 273.15.
38 degrees C=
200K=
K
degrees C
Matter is anything that takes up volume and has mass. Water, gases, elements etc
Unit Conversions: Look at table 1.5 in book!
To go from meters to kilometers
3.4m x 1Km/1000m = .0034
2.5 Km=
SN:____________________
m
Physical and Chemical Properties: Physical properties do not change the element or
compound. Chemical processes undergo reactions. Name whether the following are
physical or chemical processes.
Melting
Freezing
Converting element to compund
Boiling
Converting compound to compound
crushing
Picturefromhttp://grahamt48192.tripod.com/generalchemistrychem1615tgraham/id14.html