chem paper 1c June 2021 Flashcards
1
Q
Proves dye is most soluble in solvent
A
- Moved furthers distance
- closest to solvent front
2
Q
Find Rf value
A
Distanced moved by dye over distance move by solvent
3
Q
Product of incomplete combustion when not enough air supply
A
- CO
- H2O
- C
4
Q
Compound same molecular formula but different structural formula
A
Isomers
5
Q
Molecular formula ethane
A
C2H6
6
Q
Empirica formula of ethane
A
CH3
7
Q
Structural formula of ethane
A
CH3 CH3
8
Q
DIsplayed formula
A
The drawing
9
Q
Environmental problems cause by burying POLYMERS in landfill sites.
A
- Polymer remain in landfill
- As they are unreactive
9
Q
Effects of BURNING POLYMERS
A
- Produce toxic gases.
10
Q
Observation when lithium reacts with water
A
- move quickly
- float
- fizzes
- Dissapear
- Steam
11
Q
Universal indicator when added to water reacted w lithium
A
- purple/blue
- Due to OH-
12
Q
Chemical reaction of lithium with water
A
2Li + 2H2O -> 2LiOH + H2
13
Q
Why clean platinum wire before flame test
A
- remove impurities
- so it doesn’t interfere with colour of flame
14
Q
Why ionic have high melting
A
- GIant Ionic Structure / lattice
- Strong ionic bond between molecules
- strong electrostatic forces between positive and negative ions
- High amount of energy needed to break these bonds.
