2.2 water Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

ion

A

an atom with a + or - charge due to unequal amount of e- and protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Polar molecule

A

A molecule exhibiting seperation of charge due to unequal distribution of e-

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Isotope

A

Atoms with same amount of e- and protons, but different neutrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Water molecules

A

Are polar, Oxygen has slightly more negative chareg due to its size

Have covalent bonds, share e-

Dipolar molecule

Have hydrogen bonds between the hydrogen and oxygen (ONLY WHEN H2O binds to another H20)

Can form 4 hydrohen bonds (2 O2 & 2 H)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Cohesive and adhesive properties of water

A

Hydrogen bonds allow water to be cohesive (sticks to same molecule)

Water is adhesive (it can stick to other polar or ionic substances)

Cohesion allows water to flow up the xylem of plants against gravity due to cappilary action while adhesion adheers water to xylem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Thermal properties of water

A

Has a high specific heat capacity (High energy to break hydrogen bonds)

Has a high latent heat of vapourizastion (Liquid to a gas)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Water as a coolant

A

When water evaporates it removes a lot of energy from the system (Sweat)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Comparison of thermal properties of water to methane

A

Higher heat of vaporization

Higher melting and boiling point

Higher specific heat capacity

Higher heat of fusion (Liquid to solid)

Methane has no hydrohen bonds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Hydrophilic and hydrophobic substances

A

Phospholipid bilayer:

Phospahte head is hydrophilic

Fatty acid tail is hydrophobic

Amphipathic = have both hydrophilic and hydrophobic properties (soap)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Solvent properties of water

Solvent = Dissolving something

A

Is a good solvent because it is a polar molecule

Can dissolve polar solutes easily

Ionic solids dissociate in water (Salt NaCl):

Negative O2 side of water attracts to Na+

Positive H attract to Cl-

How well did you know this?
1
Not at all
2
3
4
5
Perfectly