Attraction
Which can you smell better, cold bread or warm bread right out of the oven? Explain why.
What is warm bread because the smell molecules turn into a gas more readily when warm.
What might a molecule of C5H10O2 smell like?
It might smell sweet or it might smell putrid, depending on the functional group.
Which functional group tells you a molecule smells putrid?
What is carboxyl or C-O-O-H.
Is a molecule of SiF4 polar or nonpolar? How do you know?
What is nonpolar because it doesn't have any lone pairs and Si is only bonded to 1 type of atom.
If a molecule has a hydroxyl functional group and is stringy in shape, how does it smell?
What is sweet.
Would HBr be attracted to a charged wand? Would it form a round drop on waxed paper? Explain your reasoning.
What is yes it is attracted and yes forms a droplet because it is polar.
What would a molecule of butylamine, C4H11N smell like?
What is fishy.
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
Is a molecule of PH3 polar or nonpolar? How do you know?
What is polar because it has lone pairs on the central atom.
If a molecule contains one oxygen and has an open ring (frying pan) shape, how will it smell?
What is minty?
Would HBr have a smell? How do you know?
What is yes, because it is polar and small.
How many lone pairs are on CH4?
What is zero.
What is the name of the -OH functional group?
What is hydroxyl or alcohol group.
Is a molecule of CH4O polar or nonpolar? How do you know?
What is polar because the C is bonded to 2 different elements.
If a molecule of C10H16O has a ring with a bridge (ball) structure, how will it smell?
What is camphor.
Would nonpolar CH4 dissolve in water? Explain.
What is no, because like dissolves like. Water is polar, and CH4 is nonpolar.
How many bonds does arsenic, As, make?
What is 3.
If you wanted to change the smell of a molecule, what might you try to do to that molecule?
What is do a chemical reaction or break bonds and make bonds.
Which direction does the dipole arrow point in a molecule of NH3?
What is towards the N, away from each H.
Describe or draw what happens to the electrons in a polar covalent bond and an ionic bond.
What is polar = unequal electron sharing
ionic = electron transfer
Which element is more electronegative? a. Zn or Br b. Li or Cs c. Au or Al
What is Br, Cs, and Al.
What does a space filling molecule not show that a ball and stick model does show?
What is double or triple bonds are now shown in space filling models but are shown in ball and stick models.
Draw two possible structural formulas for C3H8O.
O
H-C-C-C-O-H H-C-O-C-C-H H-C-C-C-H
Put the O at the end, in the middle, or attached to the center C. Include all the H of course!
What 2 things do you look for to determine if a molecule is polar or not?
What is if it has lone pairs on the central atom, or the central atom is bonded to 2 or more different elements.
Why can we smell small polar molecules, but we can't smell small nonpolar molecules?
What is our smell receptors contain polar water, and nonpolar molecules don't dissolve so we can't smell them.