Mod3 Chap8 Flashcards
What do solids in group 7 form
Lattices with simple molecular structures
What’s the trend as u move down group 7
More electrons so london forces are stronger so more enegry needed to overcome bond so boiling point is higher
What’s the electron config pattern of group 7 halogen and how does it form a halide
Each halogen atom is reduced so it gains one electron to form a 1- halide ion with electron config to nearest noble gas
what is OIL RIG
Oxidation is loss of electrons
Reduction is gain of electrons
What does the displacement reactions of halogens with halide ions show
Reactivity decreases as you move down group
What happens if halogen added is more reaction than halide present in a displacement reaction
- reaction occurs and halogen displaced halide ions
- solution changes colour
What happens to reactivity as you move down group 7
- atomic radius increases
- more shielding as shielding increases
- less nuclear attraction to capture electron from another species
- reactivity decreases
What is a disproportiation reaction
When an element simultaneously undergoes oxidation and reduction
When does a dispropritation reaction occur in a halogen
When cl2 is added to water
What substance is used to help see a colour change more clearly in a halogen
Cyclohexane
Trend as move down group 2
• atoms increase in size. Electrons further from nucleus so easier to remove and more reactive
• more shielding
What do group 2 form when added to water
Bases
What happens to properties of group 2 as move down group
• become more strongly alkaline as move down
• hydroxides become more soluble
How does magnesium react w water
Very slowly
