ochem week 2 part 1

What is the primary purpose of resonance structures?

To show how electrons can be delocalized across different atoms in a molecule.

How many bonds does carbon typically form?

4 bonds.

What is the term for the charge that results from having more or fewer electrons than protons in an atom?

Formal charge.

What is a characteristic of resonance structures in molecules?

They represent the same molecule but differ in the placement of electrons.

Which atom prefers to have a negative charge, carbon or oxygen?

Oxygen.

What is the structural representation called that shows only the bonds and not the atoms in a molecule?

Condensed structure.

What are the two types of hybridization commonly discussed in the lecture?

SP and SP2 hybridization.

What do we understand as 'delocalized' electrons?

Electrons that are not associated with a single atom or bond.

What is the formula for the simplest alkane?

CH4 (methane).

Name the three types of hydrocarbons discussed in the lecture.

Alkanes, alkenes, and alkynes.

What do we refer to as 'free radicals'?

Compounds with unpaired electrons that are usually very reactive.

What is the general rule for drawing arrow mechanisms in chemical reactions?

Arrows should start where electrons are and point to where they move.

What is the primary component of natural gas?

Methane.

Which functional group is identified by a carbonyl group (C=O)?

Carbonyl compound.

What term describes a carbon atom that has three bonds to hydrogen and one bond to another atom or group?

Amines.

What is an example of a compound that can act as a free radical?

Peroxide.

What happens to the boiling point when alcohols are compared to ethers?

Alcohols typically have higher boiling points due to hydrogen bonding.

What is a common characteristic of amines regarding their bonds?

Amines can have one, two, or three carbon groups attached to the nitrogen.

Why are resonance structures important in understanding reaction mechanisms?

They help explain the stability and reactivity of molecules.

What is a carbon chain with only single bonds referred to?

An alkane.

What does resonance mean in chemistry?

Resonance refers to the more positive and negative charges on a molecule, indicating shared electron density among different structures.

How does acetate illustrate resonance?

In acetate (C=O-OH), resonance demonstrates that the structure can shift to C-O-O(-) and switch the positions of the oxygen atoms.

What are delocalized electrons?

Delocalized electrons are those that spread across different atoms in a molecule, as opposed to being confined to a single atom.

What is an easy way to identify a resonance structure?

An easy way to identify a resonance structure is if a charge or lone pair is on an atom that is bonded to another atom with a double bond.

Where are negative charges usually assigned in resonance structures?

Negative charges are usually kept on the more electronegative atom in resonance structures.

What are free radicals?

Free radicals are single unpaired electrons that are highly unstable and can lead to explosive reactions.

What role do antioxidants play in the body regarding free radicals?

Antioxidants help neutralize free radicals, thus preventing damage to cells.

What is the most common indicator of resonance?

The most common indicator of resonance is the presence of a double bond near a charge or lone pair, indicating the possibility of p orbital overlap.

Functional Groups

Common atom groups in organic molecules that are used to classify and predict the behavior of compounds.

Hydrocarbons

Compounds made of only carbon (C) and hydrogen (H). Types include alkanes, alkenes, alkynes, arenes, and alkyl halides.

Alkane

The simplest type of hydrocarbon consisting of only single C-C bonds; generally unreactive (e.g., methane, CH4).

Alcohol Groups

Functional groups present in sugars and characterized by an -OH (hydroxyl) group.

Amines

Functional groups containing nitrogen (N) that are derived from ammonia; act similarly to alcohols.

Carbonyl Group

A functional group characterized by a carbon double-bonded to oxygen (C=O), influencing the type of functional groups based on additional attachments.

Alkyl Halide

A hydrocarbon where one hydrogen atom is replaced by a halogen (F, Cl, Br, I).

Thiols

Organic compounds containing a -SH (sulfhydryl) functional group, behaving similarly to alcohols.

Carboxylic Acid vs Amino Acid

Carboxylic acids contain a -COOH group, while amino acids contain both -COOH and -NH2 groups.

1 Carbon

Meth

2 Carbons

Eth

3 Carbons

Prop or Pup

4 Carbons

But

5 Carbons

Pent

6 Carbons

Hex

7 Carbons

Hept

8 Carbons

Oct

9 Carbons

Non

10 Carbons

Dec

11 Carbons

Undec

12 Carbons

Dode