What is the percent by mass of sodium in Na2SO4? total mass of element in compound molar mass of compound Use %Element x 100

Which of these is not a monatomic element? A. F B. Kr C. Ne D. Rn

Water left in a a freezer is called

For the chemical equations shown below, label each reactant as either acid or base, and each product as either conjugate acid or conjugate base according to the brønsted-lowry definition. drag each label to the appropriate target.

The equilibrium constant for the reaction of fluorine gas with bromine gas at 300 K is 54.7 and the reaction is: Br2 (g) + F2 (g) ⇔ 2 BrF (g) What is the equilibrium concentration of fluorine if the initial concentrations of bromine and fluorine

Why are the molecules of hydrocarbons nonpolar? the electron pair is shared almost equally in all the bonds. the intermolecular attractions are strong. all the bonds are single covalent bonds. van der waals forces overcome polarity?

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

How do I find the molar mass of Copper (II) Nitrate?

Describe several main ideas in chemistry