Matter Around Us | Term 1 Unit 3 | 7th Science - Student Activities | 7th Science : Term 1 Unit 3 : Matter Around Us
Chapter: 7th Science : Term 1 Unit 3 : Matter Around Us
Student Activities
ACTIVITY
Write down the symbols of the following elements.
Elements Symbol
Gold Au
Silver Ag
Copper Cu
Iron Fe
Nitrogen N2
Oxygen O2
Aluminium Al
Calcium Ca
Phosphorus P
Magnesium Mg
Potassium K
Sodium Na
ACTIVITY
Complete the following table by writing compounds of its constituents.
Compound : Constituent Elements
Water : Hydrogen and Oxygen
Salt (Sodium chloride) : Sodium and Chlorine
Sodium soda (sodium bicarbonate) : Sodium, Carbon and Oxygen
Baking soda (sodium bicarbonate) : Carbon, Hydrogen and Oxygen
Sugar : Carbon, Hydrogen and Oxygen
Calcium oxide : Calcium and Oxygen
Calcium hydroxide : Calcium, hydrogen and Oxygen
Sodium hydroxide : Sodium, hydrogen and Oxygen
Potassium hydroxide : Potassium, hydrogen and Oxygen
ACTIVITY
Complete the following table by counting the number of different elements in a compounds and give appropriate name.
ACTIVITY
Write down the symbols of the following elements
Gold : Au
Silver : Ag
Copper : Cu
Iron : Fe
Nitrogen : N
Oxygen : O
Aluminium : Al
Calcium : Ca
Phosphorus : P
Magnesium : Mg
Potassium : K
Sodium : Na
ACTIVITY
Write down atomicity of the following elements and compounds.
Elements Atomicity
Cl 2
Na 1
K 1
Ca 1
Compounds Atomicity
H2O 3
Nacl 2
How do hot-air balloons float? When air inside the hot air balloon is heated with a burner, it expands. The expansion causes the density of the air inside the balloon to decrease. Hence, the air inside the balloon has a lower density that the air outside of the balloon. This difference is density allows the hot-air balloon to float.
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