Phosphorus has three electrons in its 3p sublevel and sulfur has four. phosphorus should have the lower ionization energy but it does not, sulfur does. why? a. phosphorus has 2 of its electrons paired in the 3p sublevel, which makes them harder to remove, or "ionize." b. sulfur has 2 of its electrons paired in the 3p sublevel. the mutual repulsion of their negative charges makes them easier to remove, or "ionize." c. because sulfur has more electrons, they are further from the nucleus and thus easier to remove and form an ion. d. since sulfur has more electrons, it has more chances to form an ion.

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Summarize possible ways in which phases of matter could combine to form a solution.

1.) which of the following is a molecule but not a compound? a. he b. f2 c. h2o d. ch4 2.) what is a physical combination of substances? a. a compound b. a molecule c. a mixture d. an element 3.) what is a chemical combination of substances? a. a compound b. an atom c. a mixture d. an element 4.) what is the relationship between the solute and solvent in a solution? a. they form a compound b. they form a mixture c. they form molecules d. they form chemical bonds 5.) the gases in air dissolve in water. what would be one way to reduce the amount of a gas dissolved in water? a. add more water b. reduce the air pressure c. increase the air pressure d. stir the water 6.) how would you determine the solubility of a substance? a. find how well it dissolved various substances. b. find the mass and the volume of the substance. c. find the temperature at which the substance evaporated. d. find how much i was able to dissolve in a solute. 7.) the periodic table organizes all of the kinds of a. molecules. b. compounds. c. atoms. d. ions. 8.)what distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? a. whether they can be easily separated b. whether they chemically bond together c. whether they both are visible d. whether they are heterogeneous 9.) the principle components of air are: n2 78% o2 21% ar 0.95% co2 0.038% this is a solution of a. molecules and atoms. b. molecules. c. compounds and molecules. d. atoms.