C2.3 How much? Flashcards Preview

GCSE Chemistry > C2.3 How much? > Flashcards

Flashcards in C2.3 How much? Deck (9):
1

What is a mole?

the relative atomic mass in grams

2

What is the percentage yield?

amount of product produced/maximum amount of product possible x100

3

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

4

ammonium=

ammonia +hydrogen

5

What is chromoatography?

the process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper

6

Advantages of modern instruments

more accurate, quicker, analyse small samples

7

Disadvantages of modern instruments

expensive, special training, only comparison data

8

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

9

What is a mass spectrometer?

a machine that can be used to analyse small amounts of a substance to identify it and to find its relative molecular mass