Reactions in chemical and biological systems

Question 1

What is solution
Particle size
Settle

Answer 1

A homogeneous mixture where a substance is dissolved is another substance
<2nm
No

Question 2

what is a colloid
particle size
settle

Answer 2

when one chemical substance is dispersed through another
<1um >2nm
No

Question 3

what is suspension
particle size
settle

Answer 3

A heterogeneous mixture contains large particles
>1um
Yes

Question 4

Aerosols

Answer 4

Dispersion medium- gas
dispersion phase- solid or liquid
e.g hairspray

Question 5

Emulsion

Answer 5

dispersion medium- liquid
dispersion phase- liquid
e.g mayonnaise

Question 6

Foams

Answer 6

dispersion medium- Liquid or solid
dispersion phase- gas
e.g whipped cream

Question 7

Gels

Answer 7

dispersion medium- solid
dispersion phase- liquid
e.g Jelly

Question 8

Sol

Answer 8

dispersion medium- liquid
dispersion phase- solid
e.g starch in water

Question 9

Brass component, feature and uses

Answer 9

Copped and Zinc
Ductile, Low MP, Malleable
Lock

Question 10

Bronze component, feature and uses

Answer 10

Copper and tin
High ductility, Low friction, high MP
Instrument, weapons

Question 11

Steel component, feature and uses

Answer 11

iron and carbon
high bp and ductile
refrigerators and washing machines

Question 12

stainless steel component, feature and uses

Answer 12

iron and chromium
durable, low maintenance
utensils, freezers

Question 13

titanium component, feature and uses

Answer 13

titanium, aluminium and vanadium
corrosive, low density
engineering, dental implants

Question 14

amalgam component, feature and uses

Answer 14

sliver, tin, copper, zinc, mercury
durable, corrosive, strong
cavities

Question 15

solder component, feature and uses

Answer 15

tin, lead
low MP
bonding metal parts together and jewellery

Question 16

oxidation

Answer 16

Mg-> Mg^2+ +2e-

Question 17

reduction

Answer 17

2Ag+ + 2e- > 2Ag

Question 18

What is a addition reaction

Answer 18

a reaction where one molecule combines with another molecule to form a larger molecule

Question 19

what is substitution

Answer 19

a reaction that involves the replacement of one functional group with another

Question 20

What is a radical

Answer 20

an atom of a molecule that contains unpaired electron which makes it highly reactive

Question 21

displacement

Answer 21

the replacement of one element in a compound by a more reactive element

Question 22

induced fit method

Answer 22

-The binding of the substrate changes the shape of the the active site making it complementary
- The ES complex forming puts stress on the bonds and lowers the activation energy

Question 23

lock and key

Answer 23

• The substrate bonds to the already complimentary active site

Question 24

Photosynthesis equation

Answer 24

6CO2 + 6H2O > C6H12O6 + 6O2