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physics 2021 > quantitative chemistry > Flashcards

quantitative chemistry Flashcards

1
Q

mole definition (1)

A

amount of substance with the same number of particles as carbon-12

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2
Q

mole value (1)

A

6,02x10^23 (mol/n)

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3
Q

molar mass (1)

A

relative atomic mass of substance (g.mol^-1/M)

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4
Q

mole formula

A

n=m/M

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5
Q

percentage composition (1)

A

percentage of each element in a compound

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6
Q

percentage composition of an element formula (1)

A

M(element)/M(compound) x 100

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7
Q

molar volume of gas formula (1)

A

n = V/Vm

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8
Q

volume of any gas at STP (1)

A

22,4dm^3

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9
Q

empirical formula (1)

A

simplest formula of a compound in ratio

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10
Q

molecular formula (1)

A

true formula of compound based on number of atoms in physical substance

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11
Q

how to get empirical formula (3)

A
  1. assume 100g sample using percentage comp.
  2. find no. of mol in each element
  3. simplify ratio using n of moles
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12
Q

how to get molecular formula (3)

A
  1. get molar mass of empirical formula
  2. divide M of molecular formula by M of empirical formula
  3. multiply empirical formula by result in 2.
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13
Q

stoichiometry (1)

A

ratio and relationship of reactants to get a certain product

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14
Q

calculate amount of an ingredient (4)

A
  1. balance equation
  2. get no of mol
  3. use ratio to get mol of substance working out
  4. calc mass of substance u need
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15
Q

molar gas volume definition (1)

A

volume of gas at STP

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16
Q

limiting reactant (1)

A

reactant that moles will be used up first

17
Q

percentage yield (2)

A

percentage of physical product available compared to amount that should be formed
this is often different due to impure substances

18
Q

actual yield (2)

A

actual amount of product formed, always diff to theoretical yield

19
Q

theoretical yield (1)

A

amount of product that should be formed based on ratios

20
Q

percentage yield formula (1)

A

actual yield/theoretical yield x 100

physics 2021 (9 decks)

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