Chem _ unit I 2022

• Lithium and sodium are metals in group 1 of the periodic table.

  (a) (i) A physical property of group 1 metals is that they have a low melting point.

  Give one other physical property of group 1 metals.

  Soft
• When a piece of sodium is added to water, sodium hydroxide and a gas

  are produced.

  (i) Identify the gas produ

  Hydrogen
• Give one use of sodium hydroxide 


  Cleaning bleach
• Table 1

  Complete the equation for the first ionisation energy of sodium.

  Na (............) → Na+ (g) + ...................................


  Na (........g....) → Na+ (g) + ...........................e-........
• Explain why the first ionisation energy of lithium is higher than the first

  ionisation energy of sodium.


  Less shells

  Stronger attraction

  Electrons harder to remove
• Bromine reacts with iron to form iron(III) bromide.

  (a) (i) Identify the structure of iron(III) bromide.

  Giant lattice
• ) Add numbers to balance the equation for the reaction between iron and bromine.

  ......... Fe + .................. Br2 → 2FeBr3


  .......2.. Fe + ...........3....... Br2 → 2FeBr3
• Explain how the electronegativity changes from gallium to bromine.


  Electrongegvity increases from gallium to bromine

  Greater protons in nucleus

  Attraction
• Describe how a potassium atom forms a potassium ion


  Loses 1 gains 1