ATAR Unit 1-2 Chemistry

Linear shape

Bent shape

104 degree bond angle

Trigonal planar shape

120 degree bond angle

Tetrahedral shape

109 degree bond angle

Trigonal pyramidal shape

107 degree bond angle

Emission spectrum

Show white lines for emitted light

Absorption spectrum

Rainbow of absorbed light

Electronegativity difference of polar bonds

0.5-1.7 electronegativity difference

Electronegativity difference of non-polar bonds

<0.5 electronegativity difference

2 outer atoms, 1 inner atom

Linear

3 outer atoms, 1 inner atom

Trigonal Planar

4 outer atoms, 1 inner atom

Tetrahedral

3 outer atoms, 1 inner atom, 1 lone pair

Trigonal Pyramidal

2 outer atoms, 1 inner atom with lone pair

Bent

Metals which replace hydrogen in acid and water

Magnesium to potassium

Metals which replace hydrogen in acid only

Lead to aluminium

Metals which don’t replace hydrogen

Platinum to antimony