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chemistry 3/4 > misconception > Flashcards

misconception Flashcards

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1
Q

colour of Ni2+ ions

A

green

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2
Q

colour of Cu2+ ions

A

blue

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3
Q

tools used in titration

A
  • volumetric flask
    -pipette
  • burette
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4
Q

priority order of naming organic compounds

A

HIGHEST
- carboxyllic acid
-amide
-aldehyde
-ketone
-alcohol
-amine
-alkene
-alkyne

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5
Q

is a high cloudpoint good

A

NO

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6
Q

enviro impacts of reacting methane w h2o

A
  • depends on source of methane
  • if methane is derived from a source like biogas- lower impact bc decrease greenhouse emissions
  • if methane derived from fossil fuels = non renewable and increase co2 released
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7
Q

electrolysis of water enviro impact

A
  • depends on source of electrical energy
  • if energy derived from renewables eg wind or solar = C neutral and no CO2 release
    -if coal or gas is used to produce electrical energy Co2 will be released in order to produce CO2
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8
Q

controlled variable in electroplating

A
  • time
  • voltage applied
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9
Q

what is the purpose of an electrode

A
  • catalyst
  • conductor of electricity
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10
Q

Mno4- reduction

A

MnO4- + 8H+ + 5e- -> Mn2+ + 4H2O

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11
Q

Cr207 (2-) reaction

A

Cr2O7(2-) + 14H+ + 6e- -> 2Cr(3+) + 7H2O

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12
Q

direct reaction

A

reactants mixed directly in a beaker
-releases heat (thermal energy)

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13
Q

indirect reaction

A

when reaction occurs when the reactants are in 2 seperate containers
- connected by a wire
- produce electrical energy rather than thermal as e- are transferred

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14
Q

limitation of predictions

A
  • change in temp - may be too slow
  • non standard condition - potentially another product may form
  • conditions and exp design - diff voltage
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15
Q

electrolyte

A

source of ions which are used to allow for the flow of electric charge within the cell

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16
Q

fuel vs galvanic cell

A
  • both convert chemical to electrical
    -fuel cell has porous electrodes (contain catalyst) hw galvanic has non porous el.
    -fuel cell = ongoing supply of reactants in an open system hw gal. = closed system w r+P
    -fuel cells = seperate w/in same vessel while g. = seperate vessels
  • fuel cells cont. release products hw g. stores products
17
Q

consideration of H2

A
  • highly flammable
  • colourless , tasteless and odourless so hard to detect
  • explosive at higher conc.
  • high energy content by weight
18
Q

safety implications for fuels

A
  • away from naked flames (flammable)
    -well ventilated areas
    -use of extinguishers and fire blankets
19
Q

energy trans to generate electricity from natural gas

A

chemical - thermal - thermal of steam - mechanical - electrical

20
Q

faraday 1st law of electrolysis

A

the amount of any substance discharged at an electrode during electrolysis is directly prop. to the quantity of electric charge passed through the cell

  • mass lost at anode = mass gained at cathode - influences accuracy
21
Q

faraday 2nd law of electrolysis

A

the amount (in mol) of any substance discharged at an electrode during electrolysis is the reciprocal of the charge of an ion

  • greater charge on ion - greater electrical charge required to discharge the ion
22
Q

a large sample will

A

increase reliability

23
Q

describe the diff bw hydrolysis of a protein and denaturation

A
  • hydrolysis = disrupt seq of amino acids (primary) by breaking peptide bonds ( covalent)
  • denaturation X influence primary - disrupts bond in tertiary and secondary structure (H bonds) - makes protein non functional
24
Q

why is taking an average important

A
  • average allows for a more accurate conclusion to be made and will remove outliers = closer within a narrow range
    -representative of the data set
25
Q

high ph

A

all COOH lose a H+ to be COO-

26
Q

low ph

A

all NH2 gain H+ to be NH3+

27
Q

describe steps of chromotography

A
  • seperates mixture of ___ bc different strength of sp and mp
    -calibrate w=by running pure samples through a column under same conditions - determine Rt
  • relative amounts and % composition can be determined from relative areas under the peak
28
Q

whaat is the relative molar mass

A

weight average of the 2 parent ions based on relative abundances

chemistry 3/4 (8 decks)

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