Group 7 Elements Flashcards
What does PEAS stand for?
Protons, Electrons, Attractions and Shielding.
What happens to atomic radius as it goes down the elements?
Atomic Radius Increases
What happens to melting / boiling points as it goes down the elements? Why does this happen?
Melting / Boiling Points increase. This happens because: Atomic radius increases There's more room for London forces. More energy is required to break them Making the melting / boiling point higher.
As it goes down the elements, do the halogens get better or worse at being oxidising agent?
The halogens get worse at being an oxidising agent as we go down the table.
Why is Fluorine a better oxidising agent than Iodine?
Fluorine can gain an electron more easily than Iodine.
What can we use to make colours more distinct when we want to know what halogen a colour is representing?
Cyclohexane can make colours more distinct.
What reaction can we do to prove which halogens are more reactive than others?
We can react a more reactive halogen with a less reactive halide ion to show that the halogen will take the halide ion’s electron. This is often called a displacement reaction.
What colour is Aqueous Chlorine normally?
A pale green solution.
What colour is Aqueous Chlorine with Cyclohexane?
A pale green solution.
What colour is Aqueous Bromine normally?
A yellow - orange solution.
What colour is Aqueous Bromine with Cyclohexane?
A red - orange solution.
What colour is Aqueous Iodine normally?
A brown solution.
What colour is Aqueous Iodine with Cyclohexane?
A purple solution.
What three displacement reactions (with a halogen and halide ion) result in a colour change?
Cl₂ + 2Br⁻ —> Cl⁻ + Br₂
Cl₂ + 2I⁻ —> Cl⁻ + I₂
Br₂ + 2I⁻ —> Br⁻ + I₂
What colour do we get when we add silver nitrate to chloride?
White Precipitate.
