The outer most electrons that an atom possesses. They are the electrons that form bonds.
100
How do you determine which element is going to be the central atom in a lewis structure?
The least electronegative atom is the central atom.
100
What is the octet rule?
All atoms want 8 valence electrons
100
What are resonance structures
Different "versions" of a molecule that differ in the distribution of electrons.
100
What is avogadro's number:
A: 9.46x10^-20
B: 2.03x10^26
C: 3.02x10^9
D: 6.02x10^23
D: 6.02x10^23
200
How can you tell how many valence electrons and atom has?
The column number.
200
List single, double, and triple bonds in order from shortest to longest.
Short: triple, double, single :Long
200
Name the atom that will NEVER have more than 2 valence electrons.
Hydrogen
200
How do you indicate the formal charge that an atom possesses in a resonance structure?
Draw it in a circle.
200
Which of these is a metal?
A: Sulfur
B: Selenium
C: Strontium
D: Silicon
C: Strontium
300
How can you tell how many bonds an atom will form?
The column it is in.
300
List the 5 steps to write a lewis structure. (in order)
1.draw the skeleton structure
2.sum the valence e-
3.subtract two e- for every bond in the skeleton structure
4. Count the number of electrons needed to satisfy the octet for each atom
5.Place the remaining e- as lone pairs to satisfy the octet of each atom.
300
Name one atom that can be stable with less than 8 electrons.
Be or B
300
How do you determine the formal charge on an element in a molecule.
if the number of bonds formed is < the amount the atom wants it has a negative charge.
if the number of bonds formed is > the amount the atom wants it has a positive charge.
300
Which of the following is NOT a common piece of equipment found in a chemistry lab?
A: Volumetric pipette
B: Aerometric bottle
C: Burette
D: Erlenmeyer Flask
B: Aerometric bottle
400
How many valence electrons does Iodine have?
7
400
-if the # of e- you have> than the number of electrons you need what do you do?
-If the # of e- you need> the number of electrons you have what do you do?
-Place extra electrons on atoms with an expanded octet.
-Place one bond for every two extra electrons you need.
400
Name one atom that can have more than 8 electrons.
3rd row and lower
400
Draw the all possible resonance structures of CO2. Make sure to go through the 5 lewis structure steps.
CO2
400
Distillation is a chemical technique to separate substances based on what property?
A: Density
B: Particle Size
C: Solubility
D: Boiling point
D: Boiling point
500
How many bonds does Nitrogen want to form?
3
500
Draw the lewis structure for COCl2 on the board.
-go through each of the five steps. and you can ignore formal charge for now.
COCl2
500
Name four violations of the octet rule that we have learned so far.
-Hydrogen gets 2
-Be and B can have less than 8
-3rd row and lower can have more than 8
-odd amount of e- = atom with an uneven number
500
How do you determine what resonance structure would be favored? (name two ways you can tell)
1.Smallest formal charges
2.adjacent atoms have opposite charges
3. negative charges on the most electronegative atoms
500
Which of the following polyatomic anions tends to form insoluble compounds with most cations?
A:Sulfates
B:Phosphates
C:Nitrates
D:Acetates