unit 2.1 Flashcards
What does evaporation separate?
Soluble solids for solutions
What does filtration separate?
Insoluble solids from liquids
What does distillation separate?
Solutions
How does chromatography work?
Different dyes will move up the paper at different rates. some will be more attracted and stuck to the paper whereas more soluble dyes will travel further up the paper.
What do the numbers on the periodic table represent?
Top number= mass number (protons and neutrons)
bottom number= atomic number (protons)
what is yield?
The amount produced by a reaction or process.
What is predicted yield?
The amount of product expected if the reaction goes exactly as predicted.
What is percentage yield?
The percentage of the predicted yield obtained. (never 100%)
What factors affect yield?
- Some chemicals get lost along the way.
- Sometimes other reactions take place too.
- Some reactions are reversible and the products turn back into reactants.
What is a mole?
-A scientific unit.
-one mole in any substance is the same as that substances Ar/Mr in grams.
