Flashcards in C2.3 How much? Deck (9):
What is a mole?
the relative atomic mass in grams
What is the percentage yield?
amount of product produced/maximum amount of product possible x100
Why would there not be 100% yield in chemical reactions?
reaction may be reversible, might give unexpected products, product may be left on apparatus, reactants may not be completely pure, products may be mixed and hard to separate
What is chromoatography?
the process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper
Advantages of modern instruments
more accurate, quicker, analyse small samples
Disadvantages of modern instruments
expensive, special training, only comparison data
What is gas chromatography?
the process of separating the components in a mixture by passing the vapours through a column and detecing them as they leave the column at different times