Chemistry Weak Points focus Flashcards
Cover any material I need to revise and then move out of section (4 cards)
1
Q
Describe how a student could identify a pure solid from a mixture by measuring a physical property of each.
A
- Could measure melting points of both
- Pure solid has a fixed melting point
- Impure solid will melt over a range
2
Q
Explain why graphite can conduct electricity?
A
- Each atom loses an electron, which becomes delocalised
- These can move between layers
3
Q
What do group numbers represent?
A
Number of outer shell electrons
4
Q
What do periods represent?
A
Number of shells an atom has
