cach number.
1. Which of the following is not a pure substance?
a.oxygen
b.sand
C.sugar
d.water
2. Which method can be used to separate water from oil?
a decantation b.filtration G flotation d.evaporation
3. What is the best way to use in separating iron fillings from mixture?
a.Filter paper b. Magnet c. Water d.Spoon
4. Which of the following is a heterogeneous mixture?
a.Air
b.Soft drink c.Oil in Water d. Stainless Steel​