Page 18 - null
P. 18
Give reason:
1-Iron is metal element.
Because it has luster and good conductor of electricity.
2-Sulphur is a non-metal element.
Because it hasn't luster and bad conductor of electricity.
3-Bridges and car frame are made of iron. Foil papers are made
of aluminum.
Because it can be bent and hammered.
4-Electric wires are made of copper.
Carbon (graphite) is used in making positive poles of dry
cells.
-Because aluminum is good conductor of heat.
5--The handles of cooking pans are made of plastic.
Because plastic is bad conductor of heat.
6-Jewels are made of gold or silver.
Because they are shiny and can be shaped easily
6--Cooking pots are made of aluminum.
Because it is good conductor of electricity.
Bridges and car chassis are made of metals
Because metals can be bent and hammered
.
18