Percent Error & Average
Unit Conversions
Significant Figures
Dimensional Analysis & Scientific Notation
Matter
100
Find the average:
24, 27, 28, 28, 30, 32
28.17
100
Convert 0.00 deg C to Kelvin.
273.15 K
100
Identify how many significant figures the following number has:
1,278.5
5
100
Convert 7,500 milligrams to kilograms
0.0075 kg
100
What is the difference between an element and a compound?
Element: simplest form of matter that makes up more complex substances
Compound: two or more atoms are chemically bonded in a fixed proportion
200
Particulate matter data is collected every hour in Aspen. Calculate the average PM10 concentration from 6am to 2pm.
7.67
200
Convert 98.6 deg F to deg C.
37.0 deg C
200
Identify how many sig figs the number has:
0.00730
3
200
Write the following number into scientific notation:
7,072
7.072 times 10^3
200
What is the difference between a physical property and a chemical property?
A physical property: can be observed/measured without changing the matter
A chemical property: to be observed/measured actually change the identity of the matter
300
The accepted volume of a liquid is 75 mL. After conducting an experiment, the measured volume is 80 mL. Calculate the percent error.
6.67%
300
Convert 298 K to deg F
76.7 deg F
300
Perform the calculation and round your answer to the correct number of sig figs:
23.4 times 14
330
300
Write the following number into standard notation
1.09 times 10^-2
0.0109
300
Identify the following as a physical change (PC), chemical change (CC), physical property (PP), or chemical property (CP):
1. melting candle wax
2. lighting a match
3. odor
4. rotting trash in a compost bin
5. ability to corrode
1. PC
2. CC
3. PP
4. CC
5. CP
400
Clyde was directed to weigh a 500g mass on a scale. After goofing off for ten minutes, he quickly measured the object and reported 458g. Calculate the percent error.
8.4%
400
Convert 48 hours into seconds.
172,800 s
400
Perform the calculation and round your answer to the correct number of sig figs:
0.005 - 0.0007
0.004
4 times 10^-3
400
Convert 3.90 yards into centimeters.
357 cm
400
Identify the following as heterogeneous mixture (HE), homogeneous mixture (HO), element (E), or compound (C).
1. Black coffee
2. Concrete
3. Carbon
4. Diamond
5. H2
1. HO
2. HE
3. E
4. C
5. E
500
Sally performed an experiment and calculated a 15.6% error. The experimental value she measured was 25.7 mL. What is the accepted value?
22.2 mL
500
The density of mercury is approximately 13.6 g/mL. If a standard glass thermometer contains about 2 grams of mercury, how many L do you have?
1 x 10^-4 L
0.0001
500
Perform the calculation and round your answer to the correct number of sig figs:
(2.0265-2.02)/2.0265 times100.0
0.32
500
Jacob has been bragging that he can bench press 59,000 grams at the gym. Determine how many pounds of weight he is actually lifting. Write your answer in scientific notation.
1.3times10^2
500
Is density an extensive or intensive property? Justify your answer with reasoning.
Intensive because it is independent of the amount of matter present