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chemistry > C4 > Flashcards

C4 Flashcards

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1
Q

what is molar mass

A

relative formula mass of a substance in g (g/mol)

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2
Q

what is the standard atom

A

carbon-12

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3
Q

what is avogadro constant

A

23

6.02 x 10

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4
Q

what is the equation for calculating number of miles

A

Ar or Mr

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5
Q

what is a limiting reactant

A

the reactant that gets used up first in a reaction (not in excess)

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6
Q

what is percentage yield

A

how much product is made compared with how much could’ve been made (100%)

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7
Q

what factors affect yield

A

products being left behind in apparatus

reversible reactions not going to completion

some reactants produce unexpected reactions

losses in separating products from reaction mixture

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8
Q

what is the equation for calculating % yield

A

mass of product produced
—————————- X100
max mass of product
possible

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9
Q

what is the equation for calculating atom economy

A 
RFM of desired products
from equation
------------------------- X100
sum of RFM of the 
reactants from equation
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10
Q

when is 10% atom economy achieved

A

when all atoms in reactants are in products

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11
Q

what is the equation for calculating concentration in (g/dm3)

A

vol of solution (dm3)

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12
Q

how many cm3 is 1dm3

A

1000cm3

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13
Q

what is the equation for calculating the mass of a solute in g

A

concentration (g/dm3) X volume of solution (dm3)

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14
Q

what is a titration used for

A

to measure accurately what volumes of acid and alkali react completely together

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15
Q

what is an acid/base indicator used for in a titration

A

to mark the end of the reaction because when the solution changes colour, it had been neutralised

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16
Q

what is the volume of 1 mol of gas at room temp and pressure

A

24dm3

17
Q

what is the equation for calculating the number of moles of gas

A

24dm3 or 24000cm3

18
Q

what is phenolpthalein

A

an indicator used in titrations that turns from pink to colourless when an alkali changes into an acid

19
Q

what is methyl orange

A

an indicator used in titrations that changes from yellow to red when an alkali changes into an acid

20
Q

what is the relative atomic mass of an element

A

the weighted average mass of the element compared with carbon 12

chemistry (14 decks)

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