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Chem > Amount of substance > Flashcards

Amount of substance Flashcards

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1
Q

Definition for the amount of substance n

A

Number of particles in a substance.

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2
Q

What is the unit of amount of substance

A

the Mole ‘mol’

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3
Q

Number of particles in one mole/ Avogadro’s constant

A

6.02 x 10^23

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4
Q

What is one mole based on

A

The amount of atoms in 12g of carbon 12.

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5
Q

Define Molar Mass

A

Mass per mole

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6
Q

Units of molar mass

A

gMol^-1

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7
Q

Define Molar Mass Volume

A

Gass volume per mole, 24dm^3 for one mole

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8
Q

Molar mass volume units

A

DM^3 mol^-1

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9
Q

Empirical formula

A

Simplest whole number ratio of atoms of each element in a compound

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10
Q

Molecular Formula

A

The actual number of atoms of each element in a compound.

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11
Q

Define hydrated (crystals)

A

Water molecules are part of the crystals crystalline structure.

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12
Q

Define water of crystallisation

A

Water molecules found in hydrated crystals which are a part of the crystalline structure

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13
Q

Define anhydrous (crystals)

A

A salt without water of crystallisation

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14
Q

Define a salt

A

A compounds consisting of negatively and positively charged ions in a lattice formation.

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15
Q

What is the ideal gas equation

A

pV = nRT

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16
Q

What circumstances are there for the ideal gas equation pV = nRT

A
  1. There must be no intermolecular forces between gas molecules.
  2. Elastic collisions between gas molecules.
  3. The particles must have 0 volume.
  4. random motion
17
Q

Reasons for not getting a theoretical yield (actual yield)

A
  1. The reaction may of not gone till completion
  2. Other (side) reactions may of occurred along side the main reaction.
  3. Purification of the product may of resulted in loss of some product.
18
Q

How to calculate the percentage yield

A

percentage yield = actual yield/ theoretical yield x 100%

19
Q

Define atom economy

A

The atom economy of a reaction is a measure of how well the atoms have been utilised

20
Q

Calculate atom economy

A

atom economy = Sum of desired products / sum of all products x 100%

21
Q

Benefits of a high atom economy

A

Cheaper to produce and more sustainable to produce less waste products

Chem (16 decks)

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