Significant Figures
Round each number to four significant figures:
1. 156.852
2. 156.842
3. 156.849
4. 156.899
1. 156.9
2. 156.8
3. 156.8
4. 156.9
Why is density an intensive property?
It does not depend on the size or amount of the substance being measured. Instead, it is a characteristic of the substance itself.
Perform each conversion:
a. 154 cm to in
b. 3.14 kg to g
c. 109 mm to in
a. 60.6 in
b. 3.14 x 10^3 g
c. 4.29 in
Calculate:
9.15/4.970
1.84
A new penny has a mass of 2.49g and a volume of 0.349cm³. Is the penny made of pure copper? (Density of pure copper = 8.94 g/cm³)
No, 7.13 g/cm³
A runner wants to run 10.0 km. She knows that her running pace is 7.5 miles per hour. How many minutes must she run?
5.0 x 10^1 min
Calculate:
1.54 x 0.03060 x 0.69
0.033
Glycerol is a syrupy liquid used in cosmetics and soaps. A 3.25L sample of pure glycerol has a mass of 4.10 x 10^3g. What is the density of glycerol in g/cm³ ?
1.26 g/cm³
A European automobile has a gas mileage of 17 km/L. What is the car's gas mileage in miles per gallon?
4.0 x 10^1 mi/gal
Calculate:
(24.6681 x 2.38) + 332.58
391.3
Ethylene glycol has a density of 1.11 g/cm³
a. What is the mass in g of 417 mL of this liquid?
b. What is the volume in L of 4.1 kg of this liquid?
a. 463g
b. 3.7 L
A house has an area of 195 m^2. What is the area in:
a. km^2
b. cm^2
a. 1.95 x 10^-4 km^2
b. 1.95 x 10^6 cm^2
Calculate:
1. (85.3 - 21.489)/ 0.0059
1.1 x 10^4
An airplane takes on 245L of fuel. If the density of the fuel is 0.821 g/mL, what mass of fuel has the airplane taken on?
201 x 10^3 g
The average U.S farm occupies 435 acres. How many square miles is this? (1 acre = 43,560 ft^2, 1 mile = 5280 ft)
0.680 mi^2