Attraction
Formulas
Dysfunctional Groups
Know your shapes
Electropositivity!
100
Would HBr be attracted to a charged wand? Would it form a round drop on waxed paper? Explain your reasoning.
What is yes because its polar
100
What would your life be like if you couldn’t smell?
What is TERRIBLE. Think of the lost memories and the lost ability to differentiate safe and dangerous foods
100
Which two functional groups are found at the end of a molecule (as opposed to the middle)
What is carboxyl and hydroxly
100
How many lone pairs are on CO2 and what is the shape
What is 4 total (2 on each O) and it is linear
100
Draw the structural formula and place a partial positive and a partial negative charge on CH4
What is tetraherdral and the C is more electronegative so each dipole points in - they will all cancel out so its a nonpolar molecule
200
Would HBr have a smell?
What is yes because it's polar
200
Draw two possible structural formula for the molecular formula C4H11N that both follow the HONC Rule
What is make sure the N = 3 and each C =4 and each H = 1
200
Can you identify the functional group from a molecular formula, structural formula, lewis dot structure or 3D model?
What is structural formula, lewis dot structure and 3D model
200
How many electron domains does PH3 have and what is the shape
What is 4 and pyramidal
200
Name three pairs of atoms with polar covalent bonds. For each pair show the difference in electronegativity between the two atoms.
What is HF, CO, HCl
300
Which can you smell better, cold bread or warm bread right out of the oven? Explain why.
What is warm because the warmer something is, the more of that molecule will go into the gas phase, and you can only smell the gas phase
300
A polar molecule has the molecular formula C3H8O. Draw the structural formula. Draw the Lewis dot structure and label the shared electrons and the lone pairs. Identify the dipoles.
What is satisfy the HONC and octet rule, lone pairs on O and, and O is the negative end because its the most electronegative element in the molecule
300
If you wanted to invent a new smell, what would you think about doing or creating?
What is identify the given smell, and shape a molecule with that functional group
300
How many electron domains does CH2O have and what is the shape?
What is trigonal planar and 3
300
Predict whether you would be able to smell these substances. Explain your reasoning. neon, Ne ethane, C2H6 decane, C10H22 methylamine, CH5N
What is all but neon, because the other 3 or polar molecules that could form a gas and dissolve in mucous membrane
400
What macroscopic evidence could you collect that would show high intermolecular attraction (eg strong intermolecular forces)?
What is pull towards a wand or bead up as a drop
400
Does this methyl salicylate molecule drawn meet the HONC rule
What is yes
400
If you wanted to change the smell of a molecule, what might you try to do to that molecule?
What is destroy one functional group and synthesize another
400
What is the shape of NO3- (nitrate polyatomic ion)
What is trigonal planar since there is a double bond to one oxygen- most important thing here is to realize that since its a negative 1 ion you need to add an extra electron in to count, so there are 24 electrons. the law of mass conservation and the octet rule are priorities while the HONC rule can be broken (but I will always tell you if it is broken)
400
Describe or draw what happens to the electrons in a polar covalent bond, a nonpolar bond, and an ionic bond.
What is polar = shared but pulled towards EN atom. nonpolar = symetrically shared. ionic = winner takes all
500
What are some properties that could result from strong intermolecular forces?
What is high boiling point, will dissolve, and surface tension
500
A molecule can be described using a molecular formula, a structural formula, or a 3D ball-and-stick model. What information does each of these provide?
What is discuss they all show you the type of atoms and the ratio. MF does not give you shape, and SF is 2D.
500
Draw two possible structural formulas for C3H6O. Can you see one of our three functional groups? If not, is there another way you predict the smell)
What is both have a keytone (which we didn't study) but since there is no N you no its not fishy, and since it doesn't have a ester you no it's not sweet - you can do process of elimination at least (its ok to acknowledge that we don't know something!)
500
Explain why the molecule butane, C4H10, is not a straight line
What is bent shape from tetrahedral shape
500
Which element is more electronegative? a. Zn or Br b. Li or Cs c. Au or Al
What is Br, Li and Au
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