Water ✅

Question 1

What are water molecules made out of

Answer 1

3 atoms - 1 oxygen and 2 hydrogen bound together by polar covalent bonds

Question 2

Cohesion meaning

Answer 2

The ability for water molecules to stick to other molecules

Question 3

What causes surface tension

Answer 3

Cohesive forces between molecules

Question 4

How do hydrogen bonds help water molecules move

Answer 4

hydrogen bonds hold the water molecules together making them “cohesive” and able to help pull each other up to fight the pull of gravity

Question 5

How can the water strider move across parts of water

Answer 5

cohesion and surface tension

Question 6

Adhesion meaning

Answer 6

How water molecules can stick to other surfaces / molecules

Question 7

Define capillary action

Answer 7

the movement of water within the spaces of a porous material due to the forces of adhesion , cohesion and surface tension

Question 8

What bonds does water create

Answer 8

hydrogen

Question 9

Hydrophilic meaning

Answer 9

substances that are attracted to water molecules

Question 10

Definition of metabolism

Answer 10

the sum of the chemical reactions in the body that changes food into energy

Question 11

Define Specific Heat

Answer 11

The amount of energy needed to raise the temperature of a substance by 1 degrees

Question 12

higher capacity =

Answer 12

easier for heat to move

Question 13

Explain buoyancy

Answer 13

The ability for a material or a substance to float on water

Question 14

Define the viscosity (gloopy) of a substance

Answer 14

The ability to flow based on internal friction between molecules

Question 15

What feature makes water essential to living things

Answer 15

Water is the medium for metabolic reactions

Question 16

In water what causes the formation of hydrogen bonds

Answer 16

Attraction between the partially negative oxygen of one water molecule and the partially positive hydrogen of a different water molecule

Question 17

The type of bond found between atoms within a water molecule is

Answer 17

polar covalent

Question 18

At the molecular level what gives water its high surface tension ?

Answer 18

At the surface , water is only surrounded on some sides by other water molecules, so more bonding occurs between molecules along and just below the surface, creating a “skin” of water that resists rupture

Question 19

What is most likely true of a hydrophobic molecule

Answer 19

It will have no charge

Question 20

Example of capillary action

Answer 20

The move of water through pores in the soil

Question 21

Properties of hydrophilic molecules

Answer 21

Polar and can dissolve in water

Question 22

4 Physical properties of water

Answer 22

Buoyancy
Viscosity
Thermal Conductivity
Specific Heat Capacity

Question 23

Is base pairing between two strands of DNA hydrogen bonding ?

Answer 23

Yes

Question 24

What bonding is the forces the hold water molecules together ?

Answer 24

Hydrogen

Question 25

What is the bond that joins
nucleotide to its neighbour in a strand of DNA ?

Answer 25

Covalent Bonding

Question 26

What bonding is the Interactions between water and the polar R groups of certain amino acids

Answer 26

Hydrogen

Question 27

Which property of water are a result of intermolecular forces ?

Answer 27

High surface tension
Good solvent
Cohesiveness
High Specific heat capacity

Question 28

To work out nucleotides from base pairs you …

Answer 28

multiply base pairs by 2