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chemistry > amount of substance (foundations in chemistry) > Flashcards

amount of substance (foundations in chemistry) Flashcards

1
Q

what is amount of a subtance

A

the number of particles in a substance . the unit = mol and one mol is the amount of a substance that contains 6.02 x 10 ^23 particles

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2
Q

what is the mass of one mol of magnesium

A

24.3g

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3
Q

what is the unit for molar mass

A

g mol -1

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4
Q

what is molecular formulae

A

the number and type of atoms of each element in a molecule eg cl2

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5
Q

what is emperical formulae

A

a formula that shows the simplest whole number ratio of the number of atoms of each element in a compound eg p4o10 = p2o5

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6
Q

what is relative formula mass

A

the weighted mean mass of the formula unit of a
compound compared with 1/12th the mass of an atom of carbon 12

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7
Q

flouride formula

A

F-

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8
Q

nitrate formula

A

NO3-

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9
Q

hydrogen carbonate

A

HCO3-

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10
Q

carbonate

A

CO3 2-

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11
Q

sulfide

A

S2-

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12
Q

sulfate(VI)

A

SO4 2 -

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13
Q

1 ton in grams

A

1,000,000

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14
Q

1 mg in grams

A

0.001g

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15
Q

What is molar mass

A

Molar mass of a substance is the mass of one mol of a substance and it has units g mol ^-1

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16
Q

1 cm^3 in ml

A

1 ml

17
Q

1 Dm^3 in cm^3

A

1000cm^3

18
Q

1 dm^3 in m^3

A

0.001 (/1000)

19
Q

Equation linking moles , conc and vol with units

A

Moles (n) = concentration (mol dm ^-3) x volume (dm^3)

20
Q

What is the concentration of a solution

A

The concentration of a solution is the amount of solute in moles dissolved in 1 dm^3 of solution

21
Q

What is the assumption of volume of gases

A

All gases occupy the same volume of gas per mol at a fixed temp and pressure

22
Q

What is the molar gas volume

A

24.0 dm^3 mol^-1 ( at 20c and 1 atm ) so at RTP 1 mol of gas molecules has a volume of 24dm^3

23
Q

What is the ideal gas equation and units

A

P(pa)V(m3) = n(moles) R(8.314Jk-1 mol-1) T(K)

24
Q

1 atm in pa

A

10^5 pa

25
Q

25 c in K

A

298 K

26
Q

0 c in K

A

273 K

27
Q

How to convert kelvin (K) to degrees

A

-273 and vice versa

28
Q

What is a neutralisation reaction

A

Acid + base - salt + water

29
Q

How can you increase atom economy

A

Finding a use for all the products , creating no waste

30
Q

Why would a reaction not have 100% yield

A

Reversible, so won’t go to completion , some may be lost when it is separated from the reaction mixture , some of the reactants may react in ways different to the expected reaction(side reactions)(impurities)

31
Q

What is the equation for percentage yield

A

Actual yield / theoretical yield x 100

32
Q

What is the equation for atom economy

A

Total Mr of desired product / sum of total mrs of all reactant x 100

33
Q

Why is atom economy important

A

Profit , waste , sustainability

chemistry (19 decks)

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