chem meth lab pt 2

Question 1

rp of how concentration effects rate.

Answer 1

add a metal and acid and record how much hydrogen gas is produced

Question 2

disappearing cross

Answer 2

• start with two colourless liquid (sodium thiosulfate and hydrochloric acid)
• mixed together is produces solid precipitate and makes it cloudy
• how long until you can’t see said cross

Question 3

alkanes + formular

Answer 3

saturated , only single bonds

CnH2n+2

Question 4

alkenes n stuff

Answer 4

unsaturated- double bonds

CnH2n

Question 5

how to test for alkenes

Answer 5

orange bromine will turn colourless if an alkene is present

Question 6

potable water must have

Answer 6

• low dissolved salts

- low microbe levels

Question 7

reversible reactions

Answer 7

EQUAL AMOUNT OG ENERGY FORWARD AND BACK
heat = endothermic
no heat = exothermic

Question 8

process of hydrated copper sulphate

Answer 8

hydrated copper sulphate —-> (heat aka endothermic forward) ………………………………………………anhydrous copper sulphate + water

Question 9

le chats e shift to for temp

Answer 9

• increased temp –> endothermic

- decreased temp –> exothermic

Question 10

le chats e shift to for pressure

Answer 10

• increase pressure –> less molecules

- decreased pressure –> more molecules

Question 11

le chats e shift to for concentration

Answer 11

• increased concentration –> opposite side

- decreased concentration –> same side

Question 12

different fractions for crude oil

Answer 12

-gases
-petrol
-kerosene
-diesel
-fuel
-crude oil
-bitumen
(GRANDMA PORTIA KILLED DANCING FROG CALLED BARRY)

Question 13

viscosity, flammability and boiling point

Answer 13

• top= low viscosity, low bp, high flammability

- bottom= high viscosity, high bp, low flammability

Question 14

what make incomplete combustion so dangerous?

Answer 14

• created the odourless and colourless carbon monoxide- to which binds with haemoglobin instead of oxygen and so kills

Question 15

waste water treatment

Answer 15

• urban lifestyles and industrial procceses
• sewage is screened and sedimentation tanks separation to effluent and sludge to be digested
• surge is friend and digested anaerobically whereas effluent is digested aerobically
• bacteria kills and is sterilised

Question 16

definition of crude oil

Answer 16

plankton that died millions of years ago buried in mud, subjected to heat and pressure and turns to oil

Question 17

what’s cracking

Answer 17

-breaking down larger chains of hydrocarbons into smaller, more useful ones using heat/steam or catalyst.

Question 18

rf value?

Answer 18

distance traveled by substance / distance travelled by solvent

Question 19

composition of air today

Answer 19

21% oxygen
78% nitrogen
other traces of methane and c02

Question 20

how to clean salty water

Answer 20

1) distillation

2) reverse osmosis

Question 21

what’s bioleaching

Answer 21

bacteria breaking down ores to create an acid containing metals
– uses electrolysis to get

Question 22

what’s phytomining

Answer 22

-planting plants in high level metal areas, when grown, burn the plant and use electrolysis to get metal the plant got from the soil

Question 23

LCA

Answer 23

• raw material extraction
• manufacturing
• packaging/transport
• usage
• end of life

Question 24

earths early atmosphere

Answer 24

• intense volcanic activity produced water vapour (cooling to oceans) and c02
• earth was mostly c02 like venus
  
  • transition to today-
• limestones and fossils lock in c02 and algae produces oxygens