3. Amount of Substance Flashcards
What is Avagadro’s constant?
6.02 x10^23
How do you convert Celsius to Kelvin?
add 273
What is relative formula mass?
compares the mass of a formula unit to the mass of 12C
the sum of relative atomic masses in an empirical formula
How do you find the formula of a hydrated salt? (experiment)
p24
Why is experimental formula for hydrated salts not always correct? (and how do we mitigate this?)
not all water has been lost (heat to constant mass)
there was further decomposition
How do you convert g/dm^3 to mol/dm^3 ?
divide by Mr
How do you make a standard solution?
revision notes
What is RTP?
20 degrees and 101kPa
What assumptions are made about molecules that make up an ideal gas?
random motion
elastic collisions
no intermolecular forces
negligible size
What does having a high atom economy mean for a reaction?
produces a large proportion of desired products and few waste products
is good for sustainability (makes best use of natural resources)
How is a salt formed in a metal + acid reaction?
the H ion in the acid is replaced by the metal ion
