Formulae and Equations - Topic 5 Flashcards
TOPIC 5 - YEAR 1 (19 cards)
What is Avogadros number
6.02 x 10^23
What letter is used to represent Avogrados number
(L)
What is the formula for working out how many particles make up a number of moles
Particles = (L) x no. of mols
What is the formula of finding mols in a solution
No. of mols = concentration (moldm-3) x volume (dm3)
What do you convert 24cm3 into dm3
Divide by one thousand
What is empirical formula
The simplist whole number ratio of elements in a compound
How do you work out molecular formula from empirical formula
Mr of empirical formula/ Mr of molecular formula
Then use that number to multiply the atoms in the formula by
How do you calculate theorietical masses
Using mols mass and mr, and mole ratios
What are the 4 types of state symbols
s, l, g, aq
What is the equation to calculate mols of a gas
Mols = Volume (dm3) / Molar Gas Volume
What are the two molar gas volumes and their differences
At standard room temp and pressure one mole occupies 24dm3 mol-2
At standard temperature and pressure ot os 22.4 mol3dm-1
What is used to find the number of mols in a specific volume of gas, at different temp than standard and room
The ideal gas equation
What is the ideal gas equation
pV=nRT
what are the units for the ideal gas equation
p = Pa
v = m3
n = mols
R = JK-1 mol-1
T = K
How do I get from cm2 to dm2
Divide by 100
How do I get from cm3 to dm3
Divide by 1000
How do I get from m3 to cm3
x1,000,000
What is a standard solution
A standard solution is made from solids with known mass, dissolved in water, which you can then work out the conc. for
How do we create a standard solution
-Weigh the amount of solid
-Transfer the solid, make sure none left behind
-Dissolve the liquid fully using deionised water
-Transfer to a flask
-Fill up using more deionsed water
-Mix invert the flask a few times
