9.which of the following is a heterogeneous mixture?
a.air
b.oil in water
c.stainless steel
d.softdrink

10.what is/are true for subtance and mixture?
_______________________________________
| |.pure subtance melts completely. |
| ||.pure subtance has varying boiling point. |
| |||.mixture does not melt completely. |
|IV.mixture has a fixed boiling point. |
|_______________________________________|
a.I and II only
b.I and III only
c.II and IV only
d.I ad IV only

11.what does it indicate when a sugar is heated in a test tube until it is completely changed into a black mass and droplets of water?
a.compound
b.element
c.mixture
d.solution

12.what subtance is made by mixing two elements without being chemically combined?
a.compound
b.element
c.mixture
d .solution

paki anwer po
yung sakto sana
kailangan ko na po yung answer
please po​