GROUP I (Alkali Metals)
Name the 3 Group I elements we studied
Li, Na, K (Lithium, Sodium, Potassium)
What colour and state is bromine at r.t.p.?
Red-brown liquid
Name 2 transition elements
Fe, Cu, Zn, Au, Ag (any 2)
What happens to reactivity with water down Group I?
Increases
What does "diatomic" mean?
Exists as molecules of 2 atoms (e.g. Cl₂, Br₂, I₂)
What colour is copper sulfate (CuSO₄)?
Blue
What happens to melting point down Group I?
Decreases
Can Cl₂ displace I⁻ from a solution? Explain why.
Yes. Chlorine is more reactive than iodine, so it can displace iodide ions.
Give 2 properties of transition elements
High density, high melting point, form coloured compounds, act as catalysts (any 2)
Explain WHY reactivity increases down Group I
Outer electron is further from nucleus, so the attraction is weaker. This makes it easier to lose the electron.
Explain WHY reactivity decreases down Group VII
Outer shell is further from nucleus, so the attraction is weaker. This makes it harder to gain an electron.
What is a catalyst? Give an example of a transition element used as a catalyst.
A substance that speeds up a reaction without being used up. Example: Fe in Haber process