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OCR A-level Chemistry Year 1 > Chapter 3 Amount of Substance > Flashcards

Chapter 3 Amount of Substance Flashcards

1
Q

What is the Avagadros constant?

A

6.02 x 10 ^23

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2
Q

What is the equation to work out the number of moles given a mass?

A

Moles = Mass/Mr

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3
Q

The RAM in (g) of an element =

A

6.02 x 10 ^23

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4
Q

What is the molar mass?

A

The mass in grams in each mole of the substance UNIT: g mol -1

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5
Q

The RAM or RMM (in g) =

A

1 mole of a substance = MOLAR MASS

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6
Q

A standard solution is a solution of __________

A

KNOWN CONCENTRATION

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7
Q

What is the empirical formula?

A

the simplest ratio of the atoms of each element in a compound

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8
Q

What is the molecular formula?

A

the actual number of atoms of each element in the compound

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9
Q

What is the water of crystallization?

A

The water in a lattice

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10
Q

A solid salt which contains water of crystallization is a?

A

Hydrated salt

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11
Q

A salt that doesn’t contain water is a?

A

Anhydrous salt

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12
Q

What is the relative molecular mass?

A

is the average mass of a molecule compared to 1/12th of the mass of one atom of carbon-12

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13
Q

What is the relative formula mass?

A

Compares the mass of a formula unit with the mass of an atom of carbon-12.

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14
Q

What is the water of crystallization experiment?

A

1) Weigh an empty clean, dry crucible and lid
2) Add 2g of hydrated salt into the weighted crucible
3) Weigh the crucible and the hydrated salt
4) Use a pipe clay traingle, support the crucible containing the hydrated salt on a tripod
5) Heat the crucible and contents gently for 1 minute
6) Then heat it strongly for a further three minutes
7) Leave the crucible to cool. Then weigh the crucible and anhydrous salt.

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15
Q

What is the formula to find out the moles in a solution?

A

n = vol x conc
—————–
1000

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16
Q

What is the molar gas volume?

A

The volume per mole of gas molecules at a given temperature and pressure

17
Q

How do you convert dm3 to cm3?

A

x1000

18
Q

What is the ideal gas equation?

A

pV = nRT

19
Q

IGE rearranged for T

A

T = pV/nR

20
Q

IGE rearranged for n

A

n = RT/pV

21
Q

IGE rearranged for V

A

V = nRT/p

22
Q

IGE rearranged for p

A

P = nRT/V

23
Q

IGE rearranged for R

A

R = pV/nT

24
Q

How to convert from cm3 to m3?

A

x 10^-6

25
Q

How to convert from dm3 to m3?

A

x 10^-3

26
Q

How to convert *C to K?

A

+ 273

27
Q

How to convert from kPa to Pa?

A

x 10^3

28
Q

What is the formula for percentage yield?

A

Actual yield/ theoretical yield x100

29
Q

What is the limiting reagent?

A

The reactant that is not in excess will be completely used up first and stop the reaction

30
Q

What is the atom economy?

A

a measure of how well atoms have been utilised

31
Q

What is the formula for atom economy?

A

sum of molar mass of desired products/ sum of molar mass of all products

OCR A-level Chemistry Year 1 (6 decks)

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