Significant Figures
How many significant figures does this number have?
0.0250800
6
What is accuracy?
The closeness to the correct value
Write these numbers in scientific notation.
0.000,000,003,89
649,200,000,000,000
3.89 x 10-9
6.492 x 1014
Convert 783 mg to g.
.783 g
7.83 x 10-1 g
What is density?
The ratio of the mass to the volume. How much mass is packed into a unit of volume.
Perform the following calculation rounded to the correct decimal place. Then determine how many significant figures the answer has.
12.4 x 6.531
81.0
3 significant figures
What is precision?
The closeness to each other
Write these numbers in correct scientific notation.
530.1 x 10-7
0.0023 x 10-8
5.301 x 10-5
2.3 x 10-11
Convert 153.7 K to oC.
119.5 oC
What is the density of a liquid with a mass of 73.1 g and a volume of 6.5 cm3?
11 g/cm3
Perform the following calculation rounded to the correct decimal place. Then determine how many significant figures the answer has.
163.24 - 75.163
88.08
4 significant figures
When measuring on a tool that has markings to the hundredths place, to what decimal place do we record our measurement?
The thousandths place
Perform the calculation and write your answer in correct scientific notation.
(9.14 x 10-6)(6.1 x 1017)
5.6 x 1012
Convert 4.72 micrometers to terameters. Write your answer in scientific notation.
4.72 x 10-18 Tm
Calculate the density of a solid that has a volume of 4.1 x 103 mL and a mass of 5.8 x 105 g. Write your answer in scientific notation.
1.4 x 102 g/mL
How many significant figures does the following number have?
183 beakers
Unlimited
What does percent error measure?
Accuracy
Perform the calculation and write your answer in correct scientific notation.
(7.312 x 10-7) / (9.42 x 10-3)
7.76 x 10-5
Convert 805 Gg to pg. Write your answer in scientific notation.
8.05 x 1023 pg
If the density of a solid is 14.2 g/mL, and the volume is 45 mL, what is the mass of the solid?
640 g
When measuring carefully in the lab, how many digits are recorded?
All decimal places marked on the tool plus one estimated digit.
A student estimated the mass of an object to be 204 grams, but the actual mass was only 201 g. What is the percent error?
1%
Perform the calculation and write your answer in correct scientific notation.
(9.84 x 10-8) + (6.1 x 10-9)
1.045 x 10-7
Convert 5.23 x 105 mm to pm. Write your answer in scientific notation.
5.23 x 1014 pm
The mass of a gas is 81.2 g and the density is 6.23 g/cm3. Find the volume.
13.0 cm3