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Chapter: 7th Science : Term 1 Unit 3 : Matter Around Us

Student Activities

7th Science : Term 1 Unit 3 : Matter Around Us : Student Activities with Questions Answers, Solution

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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