Zirconium has an atomic number of 40 and an atomic mass of 91. how many neutrons does it have? a. 40 b. 51 c. 91 d. 131

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases. as altitude increases, air density increases. air pressure and density are lowest at sea level. denser air exerts more pressure than less dense air.

Which compound should undergo substitution of the bromine by phenolate anion? draw the structure of the organic product?

The body of water labeled with the number 3 on the map above is the and the body of water labeled with the number 7 is the a. orinoco river . . atlantic ocean b. orinoco river . . pacific ocean c. paraná river . . pacific ocean d. amazon river . . atlantic ocean