7. Water is the primary cause of rust because water contains
A. Oxygen
C. carbon
B. Chloride
D. hydrogen
?
8. Joram noticed that when he mopped the floor using wet rugs, the moist in the floor disappeared
after few minutes. What is the reason why the floor became dry?
A. presence of heat
C. presence of water
B. absence of heat
D. absence of temperature
9. When physical change in materials happened, there is
1. formation of new product or material
II, no formation of new product or material
III. formation of new shape
IV. formation of new color



Asap​