5 - Formulae, Amounts Of Substance Flashcards Preview

Edexcel A Level Chemistry > 5 - Formulae, Amounts Of Substance > Flashcards

Flashcards in 5 - Formulae, Amounts Of Substance Deck (12)
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1

What's avogadros constant?

6.02 x 10^23

2

What is the R constant

8.314

3

What is the ideal gas equation?

PV = nRT

4

Calculating moles?

mass / rfm (molar mass)

5

Moles/ rfm/ mass triangle?

mass on top! moles and rfm on bottom

6

Unit for pressure?

Pascals (pa) 1kpa = 1000pa

7

Unit for volume?

m^3

8

Converting from degrees centigrade to Kelvin?

+ 273

9

Using empirical formula?

divide the mass by the rfm for all given elements
if the ratio is clear then leave it
if not divide by the smallest
work out the ratio

10

Ionic equations?

break down all elements into their ions
cancel out ions either side of the equation
rewrite with what's left

11

Gas triangle?

volume on top, moles and 24 on bottom

12

Volume of most gases at r.t.p

24