Which of the following are true concerning atoms and molecules?

a) Molecules are made up of atoms.
b) Atoms are made up of molecules.
c) One atom could contain three molecules.
d) One molecule could contain three atoms.

Which one of the following is a chemical property of iron?

Which of the following is a homogeneous mixture?

What is the approximate width of a computer monitor screen?

Convert 0.0962 km/min to m/s.

Convert 10.1 meters per second to miles per hour.

Convert 87.4 cm² to m².

Convert 46.4 m³ to liters.

Suppose that gasoline costs $1.10 per gallon. If you use a car that gets gas mileage of 34 miles/gallon, then how much will gasoline cost for a 2000 mile (2.0 x 10³ mile) trip?

A gallon of premium latex paint is supposed to cover 400 square feet. How thick would the layer of paint be?

Perform the indicated operations and give an answer with the proper number of significant figures.
(2.023 - 1.8 x 10^-3) / 1.05 x 10⁴

What is the mass, in kg, of 2.75 liters of the liquid glycerol, which has a density of 1.26 g/mL?

What is the volume of 5.79 mg of gold? The density of gold is 19.3 g/cm³.

A rectangular block measures 3.00 cm by 1.25 cm by 1.50 cm and has a mass of 28.12 g. What is the density?

Dust from air that is not significantly polluted is deposited ("dustfall") at a typical rate of 10 tons/mi² per month. What is this dustfall expressed in mg/m² per hour? Assume a month of 30 days.

Which of these is the most precise measurement?

A pill is stamped with the label 0.6 mg. How many grams is this?

Identify the best answer to the following calculation: (541.23+3.2)/9876.5.

Which of the following common objects has a mass closest to 1 gram?

The prefix giga- has come into common usage with computer hard drives. What exactly does it mean?

If you put 1 liter of water a day into an originally empty Olympic-sized swimming pool, how long would it take to fill the pool? Assume no contribution from rainfall.