Chemistry for life

Question 1

Ionic bonding

Answer 1

When a metal loses electrons (cation) and a non metal gains electrons (anion).
The two ions are then held together with very strong electrostatic forces of attraction

Question 2

Covalent bonding

Answer 2

2 non metals achieving full electron shells, which are more stable, by sharing electrons.

Question 3

Nitrate ions

Answer 3

Needed for plants for the formation of amino acids and therefore proteins from the products of photosynthesis.
Needed for the formation of DNA

Question 4

Phosphate ions

Answer 4

Needed in all living organisms for the formation of ATP, ADP, DNA and RNA

Question 5

Chloride ions

Answer 5

Needed at synapses for nerve impulses

Question 6

Hydrogen carbonate ions

Answer 6

Needed for the buffering of blood to prevent it becoming too acidic

Question 7

Sodium ions

Answer 7

Needed for nerve impulses

Question 8

Calcium ions

Answer 8

Needed for the formation of bone, muscle contraction and to hold together plant cell walls

Question 9

Hydrogen ions

Answer 9

Needed for respiration, photosynthesis and pH balance

Question 10

Magnesium ions

Answer 10

Needed for the production of chlorophyll in plants

Question 11

Property of water

Answer 11

Polar molecule

Question 12

Hydrogen bond

Answer 12

A chemical bond in which a hydrogen atom of one molecule is attracted to an electronegative atom

Question 13

What bond can water molecules form

Answer 13

Hydrogen

Question 14

What does it mean when water molecules are described as adhesive

Answer 14

Water molecules are attracted to other different molecules