C2.1 Flashcards
1
Q
What is relative atomic mass?
A
Relative atomic mass:
- Mean mass of atom compared to 1/12 mass of carbon-12 atom
2
Q
What is relative molecular mass?
A
Relative formula mass:
- Sum of all relative atomic masses of all elements in chemical formula
3
Q
What is empirical formula?
A
Empirical formula:
- Simplest whole number ratio of atoms of each element in a compound
4
Q
What is a pure substance?
A
Pure substance:
- Single element or compound
- Specific melting/boiling points
5
Q
What is a formulation?
A
Formulation:
- Mixture designed as a useful product
6
Q
What is an alloy?
A
Alloy:
- Mixture of a metal with one or more other elements
7
Q
What is filtration?
A
Filtration:
- Separates an insoluble solid from a liquid
- Sand from water
8
Q
What is crystallisation?
A
Crystallisation:
- Separates a soluble solid from a liquid
9
Q
What is residue?
A
Residue:
- Solid left behind
10
Q
What is filtrate
A
Filtrate
- Solution in beaker
11
Q
What is crystallisation?
A
Crystallisation:
- When a solution is placed in evaporating basin and heated
- Solution evaporates
- Solid particles left behind
12
Q
What does simple distillation do?
A
Simple distillation:
- Separates a liquid solvent from a dissolved solid
13
Q
What does fractional distillation do?
A
Fractional distillation:
- Used to separate two or more liquids mixed together
- Fractionating column slows down rising gases
- Substance with lower boiling point evaporates first
14
Q
What does chromatography do?
A
Chromatography:
- Separates several dissolved substances
- Tells purity
15
Q
What is the mobile phase?
A
Mobile phase:
- Subsance that moves (water, ethanol)
- Component travels further up if it forms stronger bonds with mobile phase
