2. Which atom will be the Central Atom in the following molecules?

CO2

NO3-

COCl2

PF5
3. Indicate if the following compounds will have Polar Covalent bonds.

HCl

CH4

H2O

CO

C4H10

CCl4

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

How many moles are contained in 5.6 l of h2 at stp

Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? (2 points) decreasing temperature decreasing pressure decreasing surface area decreasing solute concentration