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9701 > STOICHIOMETRY > Flashcards

STOICHIOMETRY Flashcards

1
Q

Unified atomic mass unit

A

1/12th the mass of a C-12 atom

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2
Q

Relative atomic mass

A

weighted average mass of one atom compared to 1/12th the mass of a C-12 atom

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3
Q

Relative isotopic mass

A

mass of one isotope compared to 1/12th the mass of a C-12 atom

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4
Q

Relative formula mass

A
  • only for ionic compounds
    average mass of one formula unit compared to 1/12th the mass of a C-12 atom
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5
Q

mole

A

amount of substance that contains as many atoms as the number of atoms in 12g of carbon-12

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6
Q

mole formulas

A

n=m/Mr

n=M*v

n=v/24- at r.t.p

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7
Q

group 1 metals charge

A

+1

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8
Q

group 2 metals charge

A

+2

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9
Q

Ag charge

A

Ag+

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10
Q

Zn charge

A

Zn2+

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11
Q

Cd charge

A

Cd2+

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12
Q

group 13 charge

A

+3

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13
Q

group 14 charge

A

-4

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14
Q

group 15 charge

A

-3

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15
Q

group 16 charge

A

-2

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16
Q

group 17 charge

A

-1

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17
Q
A

nitrate

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18
Q
A

carbonate

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19
Q
A

sulfate

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20
Q
A

hydroxide

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21
Q
A

ammonium

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22
Q
A

hydrogen carbonate

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23
Q
A

phosphate

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24
Q
A

molecular eqn

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25
Q

avagadros constant

A
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26
Q
A

complete ionic eqn

27
Q
A

net ionic eqn

28
Q

always mention state symbols in

A

ionic equations

29
Q

empirical formula

A

simplest formula which shows the ratio of each kind of atom in a molecule

30
Q

molecular formula

A

shows the actual number of each kinds of atoms in a molecule

31
Q

anhydrous

A

compound in which all water molecules are removed

32
Q

hydrated

A

compound which has a number of water molecules associated with its crystalline structure

33
Q

water of crystallisation

A

the water molecules in a hydrated compound

34
Q

cm3 -> dm3

A

divide by 1000

35
Q

volume of gas=

A

n*24

36
Q

% yield formula

A
37
Q

theoretical yield

A

maximum amount of product you can get - 100% efficient

38
Q

actual yield

A

amount in g of what you actually have

39
Q

when anything is burnt in air

A

oxygen is probably in excess

40
Q

30g of C3H8 burns in air to produce 70g of CO2. Calculate the theoretical and % yield of CO2

A
41
Q

Balanced eqn for hydrocaarbon combustion

A
42
Q

when 20cm3 of a gaseous hydrocarbon was exploded with 150cm3 of excess oxygen, the residual gases occupied 130cm3 . after shaking the products with Aq. NaOH. the final volume was 90cm3 Deduce the molecular formula of the hydrocarbon ( all volumes are measured at r.t.p)

A
43
Q

Which statement about the Avogadro constant is correct?

A

It is the number of atoms in one mole of neon

44
Q

when something is exchanged

A

both will have equal volume

45
Q

when finding number of molecules

A

dont * by the number of atoms

46
Q

when calculating Mr

A

dont consider the coefficient, thats only for mole ratios and balancing

47
Q

brine

A

con.NaCl

48
Q

Cl2+ Cold NaOH

A

2NaOH+ Cl2 -> NaCl + NaClO + H2O

49
Q

Cl2+ hot NaOH

A

6NaOH+ 3Cl2 -> 5NaCl + NaClO3 + 3H2O

50
Q

thermal decomposition of nitrates

like calcium

A
51
Q

sodium chlorate (I)

A

NaClO

52
Q

Alumminium oxide

A
53
Q

Aluminium oxide + HCl

A
54
Q

CO2 is an

A

acidic gas

55
Q

CO is a

A

neutral gas

56
Q

acidic gases get used up by

A

bases

57
Q

percentage increase by mass

A

Mr of bigger compound/Mr of smaller compound * 100
and subtract 100

58
Q

mmol/l ->mg/dl

A

mmol/l * Mr *0.1

59
Q

CaCO3 + Ethanoic acid

A

CaCO3 + 2CH3COOH -> Ca(CH3COO)2 + 4H20

60
Q

% by mass

A

Mr of what your tryna find/ Total Mr *100

61
Q

decomposition of metal carbonates

A
62
Q

1mol=

A

24dm^3

63
Q

mol/g -> g/dm^3

A

divide Mr by 24

64
Q

what can be determined with just Mr

A

empirical formula
molecular formula
whether X contains a C=C

9701 (13 decks)

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