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Flashcards in Intermolecular Forces Deck (25):
1

What are the 3 types of intermolecular forces??

1. Van Der Waals
2. Dipole-dipole
3. Hydrogen bonding

2

Order the bonding types from weakest to strongest...

1. Van Der Waals (weakest)
2. Dipole dipole
3. Hydrogen bonding (strongest)

3

Van Der Waals act between...

...all molecules/atoms

4

Dipole-dipole and Hydrogen bonding act between...

...certain types of molecules

5

Van Der Waals occur when...

There are more electrons at one end of the atom, just through chance.

6

More electrons at one end of the atom results in...

...the formation of a very slight negative charge at one end of the atom (delta negative)

7

The side which has less electrons results in...

...a slight positive charge (delta positive)

8

When there are more electrons on one end of the atom - when there's a delta negative and delta positive - it is called...

An instantaneous dipole

9

Can an instantaneous dipole cause another instantaneous dipole in another atom?

Yes

10

What attractive force is formed between two dipoles??

Van Der Waals

11

As the size of the atom increases, the boiling point...

...increases because the atom is larger, so there is a larger force of attraction

12

Instantaneous dipoles can happen in any substance in which atoms can...

...move around. (So it is unlikely in solids)

13

As the boiling point increases the atomic number...

...increases

14

As boiling point increases the number of electrons...

...increases because the atom is larger.

15

The arrangement of polar bonds can result in a molecule becoming...

...polar overall

16

If a molecule is polar overall, we say the molecule has a...

...dipole moment.

17

Dipoles on different molecules can interact. This causes an...

...attractive force between different molecules.

18

Dipole forces are (1.)... in a molecule. This makes dipole-dipole forces (2.)... than Van Der Waals.

(1.)... Permanent
(2.)... Stronger

19

What causes 'delta -' in van Der Waals?

The random movement of electrons.

20

What causes the 'delta -' in dipole dipole molecules?

Electronegativity

21

When finding the boiling point, what three things do you have to consider?

1. Intramolecular forces
2. Intermolecular forces
3. Atom size

22

What three bonds are 'intermolecular'?

1. Ionic
2. Covalent
3. Metallic

23

What three bonds are 'intermolecular'?

1. Van Der Waals
2. Dipole-dipole
3. Hydrogen bonding

24

Define a 'Hydride':

A compound in which an element is bound with hydrogen

25

Define intermolecular forces:

Forces that exist between molecules