In the amino acid formula, what does the "R-" represent?

A halogen

A hydroxyl group

An alkyl group

An oxyacid

A gas has a volume of 10.0 mL when measured at 250 psi. If the pressure were changed to 500 psi, what would the new volume be?

What kind of electrical charges do protons, electrons, and neutrons have?

Magnesium metal a gray solid, is heated in a crucble in the presence of oxygen Awhite powder is collected from the crucible. This is an example or

The carbon atoms in graphite and the carbon atoms in Diamond have different

If you are given only the amount, in moles, of an unidentified chemical quantity, you can calculate the number of: representative particles in the sample << I choose this one am i right?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?

Which are the organs of the digestive system