Lec 1: Review

Question 1

Chemistry

Answer 1

Study of matter + its changes

Question 2

Ionic vs. Covalent bonds

Answer 2

Ionic: TRANSFER e- , creates ions (opp charged): cation/anion
- electrostatic attraction b/w opp charged ions in a molecule (eg: Na+, Cl-)
- these molecules deliver ions (charges)in solution, tend to dissolve in POLAR solvents like H2O
- Usually b/w M (lose e-) + NM (gain e-)

Covalent: pair of e- SHARED in a bond b/w 2 atoms w similar electroneg
- no e- transfer; can dissolve in many solvents
- Usually NM, can be NP/P
eg: H2O

Question 3

Bond Polarity

Answer 3

Uneven e- sharing b/w atoms. One has greater electroneg, creating molecules w localized polarity

Question 4

What is it called if theres uneven polarity distribution in a molecule?

Answer 4

Polar; dissolves in polar solvents

Question 5

What is general rule of thumb with Polarity/solubility ?

Answer 5

Like Polarity dissolves like polarity
eg: sugar and water vs. oil (NP) and water

Question 6

Solubility

Answer 6

amount substance able to be dissolved in V solution before reach saturation point, precip forms, can increase w temp
- am’nt / Vol

Question 7

3 Reaction Types

Answer 7

Oxidation/reduction (transfer e- b/w R +P), Precipitation, Exchange/Displacement