Tricky Stuff Flashcards
1
Q
What is avagadro’s constant?
A
6.02×10²³
2
Q
Fill in the gaps: The relative atomic mass of an element in grams=
A
The mass of 1 mole of that element
3
Q
How can you work out energy change?
A
Enery change= sum of bonds broken- sum of bonds formed
4
Q
What is a method to produce, pure dry crystals?
Hint: dilute solution, filtered off, saturated solution heated and warm place.
A
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.
