Page 6 - E-Science Prep3 2024-2025 t1 Unit2_Neat

Science department
Prep.3

First Thermal Decomposition Reactions

Some metal oxides Some metal Most metal Most Some
Metal + Oxygen hydroxides carbonates metal metal
sulphates nitrates
Metal oxide +
Water vapor Metal oxide + Metal Metal
Carbon oxide + nitrite +
dioxide Sulphur Oxygen

trioxide

Blue White
black Yellow

Red Silver Blue black Green black

Carbon Oxygen
dioxide increases
turbid the the glow
clear
limewater of a
burning
match

Air bags: Safety means in cars. Inflatable bag folded inside the steering wheel

Idea: Crash / Sudden drop in speed…… generates electric spark… Decomposes
/ explodes “sodium azid” producing nitrogen gas which inflates the bag within
40 milli sec. then it is vacuumed rapidly for clear vision.

4

Second Term
Term