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Chemistry A Level > formulae and amounts > Flashcards

formulae and amounts Flashcards

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1
Q

how much is avogadros constant

A

6.02 x 10^23

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2
Q

what does avogadros constant represent

A

it represents the amount of atoms in 12 grams of carbon-12

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3
Q

what is molecular mass t

A

this is the mass per mole of a substance

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4
Q

relative molecular mass

A

average mass of a molecule relative to 1/12th the mass of a carbon-12 atom

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5
Q

spectator ions

A

ions that dont take part in the reaction

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6
Q

hydrate

A

any compound that has water molecules

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7
Q

what is a standard solution

A

the solution with the known concentration

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8
Q

what does avogadros law state

A

provided RTP is the same, equal volumes of gases will contain same number of molecules

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9
Q

molar volume

A

the volume of 1 mole of a gas

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10
Q

precipitation reacton

A

a reaction where an insoluble solid is formed

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11
Q

error

A

the difference between the value obtained in the experiment and the actual value

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12
Q

concordant results

A

results that are close together

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13
Q

what products are formed in complete combustion

A

carbon dioxide and water

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14
Q

what products are formed in incomplete combustion

A

carbon is a form of soot and carbon monoxide

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15
Q

what is atom economy

A

this is the measure of proportion of atoms that become part of the desired product

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16
Q

are all nitrates soluble or insoluble

A

soluble

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17
Q

are most group 1 compouds soluble or insoluble

A

soluble

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18
Q

formula of hydroxide

A

OH-

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19
Q

formula of nitrate

A

(NO3)-

20
Q

formula of carbonate

A

(CO3)2-

21
Q

formula of sulfate

A

(SO4)2-

22
Q

how to write ionic equations

A

1-write the balanced equations
2-check if they are ion AND aqueous
3-cross out anything that hasnt changed and write the rest

23
Q

mole

A

this is the amount of substance that contains the same number of particles as the number of carbon atoms in 12g of carbon-12

24
Q

formula of moles using mass and molar mass

A

mass/molar mass

25
Q

formula of moles using volume of gas and molar volume

A

volume of gas/24dm3

26
Q

what is molar volume at rtp

A

24dm3

27
Q

formula of moles using concentration and volume of solution

A

concentration*volume of solution

28
Q

how many grams in 1 ton

A

1 million grams

29
Q

how many dm3 in 1cm3

A

0.001dm3

30
Q

how to find empirical formula

A

-find out moles for each element
-divide by the smallest number

31
Q

formula of ammonium

A

NH4+

32
Q

how many S.F should we always write our answer

A

3 s.f

33
Q

when finding the empirical formula and you get a number like 1.5, what do you do

A

multiply by 2

34
Q

how to find moles in gases

A

PV=nRT

35
Q

what does P stand for in the equation to find moles in gases

A

pressure

36
Q

unit of pressure

A

pascals

37
Q

how many Pa in 1atm

A

101000

38
Q

what is V in the equation to find amount of moles in gases

A

Volume

39
Q

unit of volume in the equation to find moles in gases

A

m3

40
Q

what does n stand for in the equation of moles in gases

A

moles

41
Q

what is R in the equation of moles in gases

A

gas constant

42
Q

what is gasconstant

A

8.31

43
Q

what is T in the equation of moles in gases

A

temperature

44
Q

what is the unit for temperature in the equation of moles in gases

A

kelvin

45
Q

how to convert from cm3 to dm3

A

divide by thousand

46
Q

how to convert from m3 to cm3

A

*100000

47
Q

how to convert from celsius to kelvin

A

+273

Chemistry A Level (5 decks)

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