1.2 Amount Of Substance Flashcards

1
Q

Define Relative Molecular Mass

A

Average mass of the naturally occurring isotopes of a compound, compared to 1/12 the mass of a carbon-12 atom

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2
Q

Define Relative Atomic Mass

A

Average mass of the naturally occurring isotopes of an atom, compared to 1/12 the mass of an atom of carbon-12

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3
Q

Define the Avagadro constant

A

Number of particles / atoms in one mole of a substance

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4
Q

Write the equation that links mass of 1 mol, mass of one atom and Avagradros constant

A

Mass of 1 mol = Mass of one atom x Avagradros constant

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5
Q

Define percentage yield

A

The % of a product produced by a reaction, compared to a theoretical reaction

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6
Q

How would you calculate percentage yield

A

Mass of useful product / expected mass of useful product

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7
Q

What can the percentage yield of a practical be used to investigate

A

Efficiency of practical techniques and whether reactions proceed as estimated

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8
Q

Define atom economy

A

% of products made into a certain (useful) product

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9
Q

How would you calculate atom economy?

A

Mr of atoms of useful product / Mr of atoms of reactants

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10
Q

What can the atom economy of a reaction be used to investigate?

A

Efficiency of using a specific reaction to produce a product

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11
Q

Write the ideal gas equation (in symbols and in words with units)

A

PV = nRT
Pressure x volume = number of moles x gas constant x temperature
Pressure in Pa, Volume in m3, gas constant R = 8.31, Temperature in K

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12
Q

What are the standard conditions

A

25*C / 298K
1 atm / 100k Pa

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13
Q

How do you convert between K and C temperatures

A

C to K = +273
K to C = -273

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14
Q

Define empirical formula

A

Simplest whole number ratio of atoms in a compound

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15
Q

What is the equation that links mols, concentration and volume?

A

Moles = concentration x volume

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16
Q

What is the equation that links moles, mass and Mr?

A

Moles = Mass / Mr