Chemistry quest intermolecular forces

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If a molecule has an electronegativity difference of 0-0.4, what type of compound is it

nonpolar covalent

If a molecule has a electronegativity difference of 0.4-1.7, what type of compound is it

polar covalent

If a molecule has a electronegativity difference of 1.7-4, what type of compound is it

ionic

N2F4 lewis dot diagram

C2H5OH lewis dot diagram

What happens to electrons in a covalent bond

• Electrons are shared between two atoms

What happens to electrons in a ionic bond

they are transferred

What type of elements is a covalent bond formed betweem

A covalent bond is formed between nonmetal elements.

How do you know which atom should be in the center when drawing lewis diagrams

the least electronegative

Which compound is most liekly to form a compound between each other A.aluminum and oxygen

B. magnesium and iodine

C. sulfur and fluoride

D. potasium and lithium

E. barium and bromine

C.

Which bonds would be considered covalent

1. H-S
2. Al-S
3. N-F

1 and 3

A double bond consists of how many pairs of shared electrons

2

How can you use electronegativity to predict the bond type?

The greater the difference in electronegativity, the more polar the bond.

Why does a greater difference in electronegativity cause a more polar bond?

A bigger difference in electronegativity means that one atom is able to hog electrons for longer, creating a charge imbalance (partial-charge). The more electronegative atom would be slightly negative and less would be slightly positive

Are inter or intra moleculer forces stronger

Intramolecular forces like ionic and covalent bonds are stronger then intermolecular forces.

What is the order of bond strength

ionic bonds, covalent bonds, hydrogen, dipole-dipole, london dispersion

How strong is a london dispersion force

Weak

What type of molecules use London Dispersion forces?

all molecules

What happens to electrons in a london dispersion force

due to the constant motion of electrons they occasionally end up all on one side of the molecule creating a temporary dipole.

How does size of a molecule relate to the strengh of london forces

Bigger mass= stronger forces

are london dispersion forces temporary or permanent.

Temporary. They are caused by the movement of electrons, which creates temporary dipoles in molecules.

are dipole-dipole forces temporary or permanent

permanent

What causes dipole-dipole forces

A molecule being unbalances. There could be a pair of lone electrons, or the difference in electronegativity is very high between atoms in the molecule.

How does a dipole-dipole affect the interactions between molecules?

A charge inbalnece means that one side of the molecule is slightly positive while the other side is slightly negative. Thus two different molecules are attracted to each other so that the positive side of one molecule is attracted to the negative side of the other.

What are the four elements can be involved in a hydrogen bond

• Nitrogen (N)
• Oxygen (O)
• Fluorine (F)
• Hydrogen (H)

What is the trend for boiling point

Stronger intermolecular force=higher boiling point

What is the order of boiling point trends between the different bonds, highest to lowest

Ionic bonds, hydrogen bonds, dipole-dipole, london dispersion.

What do weak dipole-dipole forces result in?

a lower melting point

A hydrogen bond is _ (stronger/weaker) than a London Dispersion force and (stronger/weaker) than an ionic bond

stronger, stronger

Without London Dispersion Forces most nonpolar compounds would be a_ at room temperature

gas