Sig Figs
How many sig figs are in 90.800?
What is 5?
Write 7,880,000,000 in scientific notation.
7.88 x 10^9
Working in the laboratory, a student finds the density of an object to be 4.09 g/mL. The accepted value for the density of the object is 4.102 g/mL. What is the student's percent error?
Round your answer to the nearest hundredth place.
0.29%
Write out the formula for density
Density = Mass/Volume
250 mm = _____ cm
25 cm
To convert from mm to cm, divide by 10 or move the decimal place to the left
How many sig figs are in 0.000541?
What is 3?
Write 0.0000000003 in scientific notation.
3 x 10^-10
Working in the laboratory, a student finds the density of an object to be 3.85 g/mL. The accepted value for the density of the object is 3.098 g/mL. What is the student's percent error?
Round your answer to the nearest hundredth place.
24.27%
Calculate the density of an object that has a volume 30 mL and weighs 120 grams. Be sure to include units.
4 g/mL
120 g/30mL
10,000 m = ____ km
10 km
Write a number with 5 sig figs.
Examples:
0.045938 90.001
94829 56007
78.000 305.10
Write in 5.4 x 10^-7 number form.
0.00000054
What is an acceptable percent error for a student to have if I tell them to aim for less than 5%?
Anything 0.0%-4.9%
Calculate the density of an object that has a volume 55 L and weighs 18 kilograms. Be sure to include units.
Round to the nearest hundredth place.
0.33 kg/L
18 kg/55L
2,000 cm = ____ m
20
To convert from cm to m, divide by 100 or move the decimal 2 places to the left
Which number has 3 sig figs?
a. 0.91 c. 700
b. 8091 d. 9.00
What is d. ?
Write 149,000,000 in scientific notation.
1.49 x 10^8
Mark uses his thermometer and finds the boiling point of a liquid to be 71°C. He looks in a reference book and finds that the actual boiling point of the liquid is 77°C. What is his percent error?
Round your answer to the nearest hundredth place.
7.79%
Why is warm air lighter than cold air?
Warm air is less dense. The molecules that make up warm air are further apart.
Kennedy and her sister play tennis at the park near their house. The length of the tennis court is 2,400 centimeters. How many meters long is the tennis court?
2,400 cm = 24.00 m
To convert from cm to m, divide by 100 or move the decimal 2 places to the left
Write a number, including a zero in that number, with 2 sig figs.
Examples.
2.0 1.0
6.0 9.0
Write 5.221 x 10^-8 in number form.
0.00000005221
An object has a mass of 36.7 grams. On your electronic balance, it weighs 34.8 grams. What is the percent error of the balance?
Round your answer to the nearest hundredth place.
5.18%
Using g/mL, calculate the density of an object with a mass of 6 kg and a volume of 300 mL.
20 g/mL
6,000g/300mL
6kg = 6,000g
2 L = ____ mL
2,000 mL