Amount of substance Flashcards

1
Q

Avogadro constant definition

A

Number of atoms in 12g C12

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2
Q

Number of particles equation

A

Moles x avagardos constant

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3
Q

Ar definition

A

Average mass of an atom of an element/ 1/12th the mass of C12

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4
Q

Percentage yield

A

Actual yield/theoretical yield x100.

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5
Q

Importance of percentage yield

A

Importance: Increases the amount of product that is made from the reactants, can be increased by making improvement in experimental technique.

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6
Q

Atom economy

A

mass of desired product/ total mass of reactants x100
(mr/mr x100)

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7
Q

titration accuracy

A
  • remove any air bubbles- volume will be counted in burette reading
  • remove funnel- solution drops could fall from funnel into burette affecting burette reading.
  • rinse with distilled water- ensures all reactants mix and no reagent is unreacted. Moles remains the same.
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7
Q

Standard solution

A

Transfer known mass of solid. weigh sample bottle cotaining solid on a balance. Transfer the beaker to re-weigh sample bottle. record difference in mass. Dissolves in water, add distilled water, stir with a glass rod, until all has dissolved. Transfer to volumetric flask using funnel with washings, make up to 250cm^3. Invert to mix

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8
Q

Percentage error and how to reduce it

A

error of equipment/ amount measured x 100
How to reduce it: Increase the concentration of solution in conical flask, decrease conc of solution in burette.

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9
Q

Ideal gas equation

A

pv=nrt

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10
Q

finding mean titre

A

Use only concordant results, values that are within 0.1 of each other, add together and divide by how many there are.

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11
Q
A
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