Match the planet to its description.
Mars
[Choose]
Venus
[Choose]
Earth
[Choose]
Mercury
[Choose]

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is

The density of e85 fuel is 0.801 g/ml. what is the mass of 1.00 gallon of the fuel? (1 gal. = 3.785 l)