triple chem content Flashcards

1
Q

Physical properties transition elements

A

good conductors of thermal energy/electricity
hard and strong
high density
high melting points(except mercury-liquid at room temp) (higher than alkali metals)

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2
Q

chemical properties transition elements

A

less reactive than group 1
do not react easily with water/o2
eg. copper has to be jeated to react with o2
corrode very slowly

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3
Q

colours of transition metal compounds:
copper(2) sulfate
nickel(2) carbonate
chromium(3) oxide
manganese(2) chloride

A

copper(2) sulfate—> blue
nickel(2) carbonate—>pale green
chromium(3) oxide—>dark green
manganese(2) chloride—>pale pink

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4
Q

transition metal used as a catalyst in the haber process

A

Iron

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5
Q

coarse particles are also known as…

A

PM10

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6
Q

Coarse particles-diameter

A

between 110^-5m and 2.510^-6m

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7
Q

fine particles are also called…

A

PM2.5

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8
Q

fine particles diameter

A

100-2500 nanometers
110^-7m and 2.510^-6m

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9
Q

nano particles diameter

A

between 1-100 nanometers

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10
Q

what happens to the particles surface area to volume ratio when the size is decreased by 10

A

increases by 10 times

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11
Q

benifits of nanoparticles having a huge surface area to volume ratio

A

a much smller quantity of nanoparticles is needed

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12
Q

risks of nano particles

A

violent explosions from sparks as they have large surface areas

unpredictable effects on cells
environment
more research required

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13
Q

how much volume does one mole of gas occupate at room temp//pressure

A

24 dm cubed

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14
Q

what is room temp

A

20C

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15
Q

What is room preassure

A

1 atmosphere

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16
Q

volume of gas formula

A

volume(dm cubed)=number of moles*24

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17
Q

reaction for titration

A

sulfuric acid+sodium hydroxide—>sodium sulfate+water

neutralisation reaction

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18
Q

what do titrations tell us

A

if we have a certain volume of sodium hydroxide and we know the concentration+

we know the volume of sulfuric acid needed to neutralise the alkali we can use this to calculate the concentration of the acid

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19
Q

describe process of titration

A

1.use pipette to transfer 25 cm cubed of sodium hydroxide into a conical flask (allow liquid to drain out of pippette dont force it out bcz wrong volume will be given… use pipette filler)
2. add 5 drops of indicator… methyl orange or phenolphthalein into the alkali flask
3. place flask on white tile to see colour change clearly
4. fill a burette with sulfuric acid
5. add acid to the alkali until solution is neutral
once colour change is detected allow acid to be added drop by drop
swirllll
6. read volume of acid added from the burette at the meniscus

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20
Q

fuel cells negative electrode equation

A

2H2—->4H(+)+4e(-)

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21
Q

fuel cells positive electrode equation

A

O2+4H(+)+4e(-)—->2H2O

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22
Q

Overall fuel cell equation

A

2H2+O2—>2H2O

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23
Q

What happens to hydrogen in fuel cells

A

Hydrogen

24
Q

general formula for alkenes

A

CnH2n

25
Q

general formula for alkanes

A

CnH2n+2

26
Q

what is a functional group

A

part of molecule that determines how it reacts

27
Q

what do you call the reaction between Hydrogen and an alkene

A

hydrogenation

28
Q

alkene+hydrogen—>?

A

alKANE

29
Q

alKENE +Water

A

hydration
makes an alcohol

30
Q

conditions required to react and alkene with water`

A

water must be steam
pressure of 70 atmosphere
temperature of 300 C*
phosphoric acid as a catalyst

31
Q

uses of alcohols

A

fuels
solvents
alcoholic drinks

32
Q

methanol structural formula

A

CH3OH

33
Q

ethanol structural formula

A

CH3CH2OH

34
Q

propanol structural formula

A

CH3CH2CH2OH

35
Q

Butanol structural formula

A

CH3CH2CH2CH2CH2OH

36
Q

ways to make ethanol

A

hydration of ethene
fermentation of sugar
» glucose__>(yeast//30C*) ethanol+CO2

37
Q

Disadvantage of making ethanol by fermentation

A

product is an aqueous solution. needs to be purified by distillation which requires energy

38
Q

general formula for alcohols

A

CnH(2n+1)OH

39
Q

ethene+bromine–>

A

diobromoethane

40
Q

alcohol+oxidising agent–>?

A

Carboxylic acid

41
Q

ethanoic acid+sodium carbonate—>

A

sodium ethanoate+CO2+H2O

42
Q

Carboxylic acid+alcohol

A

ester+H2O

43
Q

addition polymers

A

monomers are alkenes

44
Q

condensation polymers

A

starts with 2 different monomers each monomer has 2 of the same functional group

45
Q

flame test lithium colour

A

crimson

46
Q

flame test sodium

A

yellow

47
Q

flame test potassium

A

lilac

48
Q

flame test calcium

A

orange-red

49
Q

flame test copper

A

green

50
Q

copper(2) ions+NaOH

A

blue precipitate

51
Q

iron(2) ions+NaOH

A

green

52
Q

iron(3) ions+NaOH

A

brown

53
Q

test for carbonate ion

A

add dilute acid
co2 gas–> effervescense
bubble gas through lime water
cloudy= present

54
Q

test for halides

A

add dilute nitric acid
add dilute silver nitrate solution
precipitate

55
Q

what precipitate do each halide make
chloride ions
bromide ions
iodide ions

A

chloride ions-white
bromide ions-cream
iodide ions-yellow

56
Q

test for sulfate ions

A

add dilute HCL
Add barium chloride solution
white precipitate if ions are present