Unit Conversions
12.5 mg to kg
What is 1.25 x 10^-5 kg?
Which one of the following is an example of a change in PHYSICAL property of a substance?
a) dynamite explodes
b) wood burning
c) metal rusting
d) ice floats on top of water
What is d) ice floats on top of water?
-0.26 degrees Celsius converted to Kelvins
What is 272.89 K?
How much is one -kilo?
What is 1 x 10^3?
Which of the following represents a PHYSICAL property?
a) corrosiveness
b) combustion
c) boiling point
d) flammability
What is c) boiling point?
10.76 in to nm
What is 273,304,000 nm?
Which one of the following represents a CHEMICAL change?
a) boiling water to form steam
b) chopping wood
c) burning a piece of coal
d) mixing gray and green marbles
What is c) burning a piece of coal?
In the correct units and sig figs, what is the mass of ethanol with a density of 0.789 g/mL and a volume of 32.5 mL?
What is 25.6 grams?
How much is one centi-?
What is 1 x 10^-2?
Precision pertains to all of the following EXCEPT?
a) reproducibility of measurements
b) agreement among numerical values
c) sameness of measurements
d) closeness of a measurement to an accepted value
What is d) closeness of a measurement to an accepted value?
22.34 cm^3 = ____ liters
What is 0.02234 liters?
Which of the following is an exact number?
a) speed
b) 12 dozen eggs
c) temperature in a room
d) the mass of a graduated cylinder
What is b) 12 dozen eggs?
An empty container with a volume of 9.850 x 10^2 cm3 is weighed and found to have a mass of 124.6 g. The container is filled with a gas and reweighed. The mass of the container and the gas is 126.5 g. Determine the density of the gas to the appropriate number of significant figures.
What is 0.0019 g/cm^3?
How much is one milli-?
What is 1 x 10^-3?
The volume of a sample of gas is 22.4ft^3. What is the volume of gas in units of cm^3?
What is 6.34 x 10^5 cm^3?
62.4 miles/hr= ____ m/s (1 mile = 1609 m)
What is 27.9 m/s?
Which of the following are intensive properties?
i. melting point ii. volume iii. mass iv. temperature v. density
a) i, ii, v
b) ii, iv
c) i, iii, iv
d) i, iv, v
e) all of them
What is d) i, iv, v?
Ice cubes float in a glass of water because solid water is less dense than liquid water.
What is a) 0.92 g/cm^3 and b) 25 cm^3
The Food and Drug Administration (FDA) recommends that dietary sodium intake be no more than 2400 mg per day. What is this mass in pounds (lb)? (Hint- 453.6 grams are in 1 pound)
What is 0.005291 lb?
What is the length of 132 pm in units of m?
What is 1.32 x 10^-10 m?
1550 cubic feet (ft^3) = ____ liters
What is 43891.11222 liters?
Which of the following is a homogenous mixture?
a) seawater
b) trail mix
c) chicken noodle soup
d) soda with ice
What is a) seawater?
Which of the following represents a substance and why?
a) apple juice
b) seawater
c) oxygen
d) trail mix
What is c) oxygen because it has a definite composition and distinct properties.
How many significant figures are in the following measurement: 3.000 x 10^6 Hz?
What is 4 significant figures?
Perform the following operation with the correct sig figs and units:
5.46x10^2 g + 4.991×10^3 g
What is 5.537 x 10^3 g?