Which statement is correct for the reaction below?

4x+z yields 2r+2s
a: the rate of formation of r is one-half the rate of the disappearance of z.
b: the rate of disappearance of z is one-fourth of the rate of disappearance of x.
c: the rate of formation of r is double the rate of formation of s.
d: the rate of formation of s is double the rate of disappearance of x.

Fossil fuels are organic compounds that are made from

Consider the story you just read. all but one of the choices below indicate that something is living.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.