What weight of sodium nitrate (NaNo3) must be used to prepare 506mL of a 10.5 M solution of this salt in water? Answer in units of g.

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?

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.