How many valence electrons are in the highest occupied energy leve of an atom

Which of the following describes the distribution of sodium and potassium between cells and body fluids?

Which reaction is single replacement? (1) 2H2O2 - - > 2H2O + O2 (2) 2H2 + O2 - - > 2H2O (3) H2SO4 + Mg - - > H2 + MgSO4 (4) HCl + KOH - - > KCl + H2O

Which refers to the sum of all the forces that act upon an object? absolute force Onet force positive force O balanced force Save and Exit Next Submit Mark this and return

A metal surface becomes dull because of continued abrasion. chemical or physical

Suppose you stir a little baking soda into water until the water looks clear again how could you prove to someone the material is a solution and not a compound

What is the most massive element?

A liquid would boil at the lowest temperature at a pressure of

The reaction 2HgO (s) ↽⇀ 2Hg (l) + O2 (g), you produce 1 mole of Hg (I). What is your percentage yield? A) 30% B) 20% C) 50% D) 100%

What are the concentrations of Cu2+, NH3, and Cu (NH3) 42 + at equilibrium when 18.8 g of Cu (NO3) 2 is added to 1.0 L of a 0.

Estimate the optimal number of neutrons for a nucleus containing 70 protons.