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
Q

What’s avogadros constant?

A

6.02 x 10^23

2
Q

What is the R constant

A

8.314

3
Q

What is the ideal gas equation?

A

PV = nRT

4
Q

Calculating moles?

A

mass / rfm (molar mass)

5
Q

Moles/ rfm/ mass triangle?

A

mass on top! moles and rfm on bottom

6
Q

Unit for pressure?

A

Pascals (pa) 1kpa = 1000pa

7
Q

Unit for volume?

A

m^3

8
Q

Converting from degrees centigrade to Kelvin?

A

+ 273

9
Q

Using empirical formula?

A

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
Q

Ionic equations?

A

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

11
Q

Gas triangle?

A

volume on top, moles and 24 on bottom

12
Q

Volume of most gases at r.t.p

A

24