Tricky Stuff
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What is avagadro’s constant?
6.02×10²³
Fill in the gaps: The relative atomic mass of an element in grams=
The mass of 1 mole of that element
How can you work out energy change?
Enery change= sum of bonds broken- sum of bonds formed
What is a method to produce, pure dry crystals? Hint: dilute solution, filtered off, saturated solution heated and warm place.
1) excess [magnesium carbonate) added to dilute solution, until no mlre dissolves. (Shows no more is reacting). 2) excess magnesium carbonate is flitered off. 3) saturated solution heated for a few minutes (to evaporate some of the water). 4) leave in a warm place until dry crystals are formed, or until the crystals can be dried on fliter paper.