State the electron domain, molecular shape, bond angle/s and polarity: PH3
4, trigonal pyramidal, 107, polar
Oops!
Check
Okay!
Check
10
Give an example of a substance that is very soluble in water and has a pyramidal shape.
(answers may vary - NH3, PH3, ...)
Oops!
Check
Okay!
Check
boom
Lose 50 points!
Oops!
rocket
Go to first place!
Okay!
rocket
Go to first place!
Okay!
lifesaver
Give 10 points!
Oops!
seesaw
Swap points!
Oops!
gold
Win 50 points!
Okay!
gift
Win 10 points!
Okay!
banana
Go to last place!
Oops!
15
Explain why pure carbon has a melting point of approximately 3550C while pure nitrogen has a melting point of -210C.
Carbon = giant covalent structure = strong bonding; N2 molecule = weak dispersion forces between particles = requires lesser energy to separate them
Oops!
Check
Okay!
Check
10
Give an example of a substance that has a very high 1st ionization energy, a very low BP and does not form bonds.
(answers may vary - any noble gas)
Oops!
Check
Okay!
Check
10
Why is the melting point of HI higher than HBr?
HI has greater molar mass (more electrons) and so it has stronger dispersion forces than HBr
Oops!
Check
Okay!
Check
15
State the electron domain, molecular shape, bond angle/s and polarity: CH4
4, tetrahedral, 109.5, non-polar
Oops!
Check
Okay!
Check
15
Explain why polar molecules are often soluble in water while non-polar molecules are not. Include discussion on the intermolecular processes involved in dissolving.
soluble = IMF solute and IMF solvent are similar; water is polar = h-bonding and dipole dipole; nonpolar solute = dispersion (way weaker than IMF in solvent)
Oops!
Check
Okay!
Check
seesaw
Swap points!
Oops!
star
Double points!
Okay!
rocket
Go to first place!
Okay!
baam
Lose 15 points!
Oops!
10
What element combines with another element by sharing 1 pair of valence e and combines with hydrogen to form a molecule that exhibits hydrogen bonding?
Fluorine
Oops!
Check
Okay!
Check
15
State the electron domain, molecular shape, bond angle/s and polarity: CH2O
3, trigonal planar, 120, polar
Oops!
Check
Okay!
Check
10
What does "HPLC" stand for?
High Performance Liquid Chromatography
Oops!
Check
Okay!
Check
15
State the electron domain, molecular shape, bond angle/s and polarity: SO2
3, bent, 117.5, polar
Oops!
Check
Okay!
Check
10
Explain why HCl is more soluble in water than Cl2.
HCl is a polar molecule (forms ion-dipole interaction with water) while Cl2 is non polar
Oops!
Check
Okay!
Check
10
State the relationship between IMF and vapor pressure
A liquid with weak intermolecular forces evaporates more easily and has a high vapor pressure.
