How many neutrons are in an atom with the atomic number of 15 and an atomic mass number of 34?

? 19

? 15

? 34

If there are 2 forms of C, Carbon 12 and Carbon 14, Carbon is said to have compound isotopes ions molecules

DDT was banned in The United States because it what?

What is the shape of an S orbital?

How does a sample of helium at 15 °C compare to a sample of helium at 215 K? The helium at 15 °C has a higher average kinetic energy than the sample at 215 K. The helium at 15 °C has lower nuclear energy than the sample at 215 K.

If heat flows out of a system, the heat change (AH) will be , and the reaction will be

Describe and give an example of parasitism.

Why is a dilute solution of oleic acid used instead of pure oleic acid?

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?

Aldo drove 420 miles using 18 gallons of gas. at this rate, how many gallons of gas would he need to drive 357 miles

How many grams of As2S3 are in 3.25 moles?