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1.2 Amount of Substance Definitions Flashcards

(11 cards)

1
Q

Define Atom economy (and equation)

A

The measure of the amount of starting material that end up as useful products.

Percentage atom economy = (Molecular mass of desired product/ sum of molecular masses of all reactants) x 100

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2
Q

Define Avogadro’s constant

A

The number of atoms, molecules or ions in one mole of a given substance

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3
Q

Define Concentration (and units)

A

The amount of substance per unit volume. Units given in g/dm^3 or mol/dm^3

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4
Q

Define Empirical formula

A

The smallest whole number ration of atoms of each element in a compound

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5
Q

Define Limiting reactant

A

The reactant that is completely used up since it limits the amount of products formed

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6
Q

Define Mole

A

The mass of a substance containing the same number of units as there are atoms in exactly 12g of carbon-12

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7
Q

Define Molecular formula

A

The actual ration of atoms of each element present in a compound

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8
Q

Define Percentage by mass (and equation)

A

A value representing the concentration of an element in a compound or a component in a mixture

Percentage by mass = (Mass of desired component/ Total mass of mixture) x 100

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9
Q

Define Percentage yield (and equation)

A

The percentage ratio of the actual yield of product from a reaction compared to the theoretical yield

Percentage yield = (Actual yield/Theoretical yield) x 100

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10
Q

Define Relative atomic mass

A

The average mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12

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11
Q

Define Relative molecular mass

A

The average mass of one molecule of an element or compound compared to 1/12th the mass of an atom of carbon-12

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