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Chemistry > 2.1.3 Amount of substance > Flashcards

2.1.3 Amount of substance Flashcards

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1
Q

Molecular formulae

A

number of atoms of each element in a molecule

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2
Q

Empirical formulae

A

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

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3
Q

Relative molecular mass

A

compares mass of molecule with mass of C12

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4
Q

dm3 to cm3

A

x1000

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5
Q

concentration definition

A

amount of solute in moles dissolved in each 1dm3 of solution

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6
Q

moles equations

A

mass/molar mass
volume/molar volume
volume x concentration

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7
Q

molar volume

A

24 dm3
24 000 cm3

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8
Q

Ideal gas equation

A

pV=nRT

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9
Q

what is R in the ideal gas equation

A

ideal gas constant
8.314 J mol-1 k-1

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10
Q

units for temperature in the ideal gas equation

A

kelvin

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11
Q

units for volume in ideal gas equation

A

m3

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12
Q

units for pressure in ideal gas equation

A

Pa

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13
Q

cm3 to m3

A

x10-6

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14
Q

dm3 to m3

A

x 10-3

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15
Q

degrees to kelvin

A

+273

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16
Q

KPa to Pa

A

x 1000

17
Q

what do molecules in the Ideal gas law show

A

random motion
negligible size
no intermolecular forces

18
Q

how does pressure arise

A

due to collisionsbetween gas molecules and the size of the container theyre in pressure builds up

19
Q

what does pressure depend on

A

number of particles in a container
size of container
the absolute container

20
Q

percentage uncertainity

A

(error x number of readings/quantity measured ) x100

21
Q

error

A

half the resolution unless a digital reading then its just the resolution

22
Q

Avogadros constant

A

6.02 x10^23

23
Q

Acids

A

contain hydrogen

24
Q

what do acids do when in water

A

release hydrogen as protons
H+

25
Q

Strong acid

A

e.g HCl
releases H+ ion in solution and dissolves completely by completely dissociating

26
Q

weak acid

A

e.g CH3COOH
only releases H+ ion and only partially dissociates

27
Q

Alkali

A

a base that dissolves in water releasing OH- ions

28
Q

Acid + alkali

A

salt + water

29
Q

Acid + metal oxide or metal hydroxide

A

Salt + water

30
Q

acid + carbonates

A

Salt + water + carbon dioxide

31
Q

molecules in ideal gas law

A

show random motion
have negligible size
no intermolecular forces - bounce off each other when they collide

Chemistry (34 decks)

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