What is a Mixture?

Question 1

What is a mixture?

Answer 1

Mixtures are constituted by more than one kind of pure form of matter.

Question 2

How can we say that a mixture contains more than one pure substance?

Answer 2

1. A pure substance cannot be separated into its chemical constituents by physical process.
2. The composition of a pure substance is the same throughout.
3. A pure substance will always have the same characteristic properties.
   Hence, we can say that a mixture contains more than one pure substance.

Question 3

HAVE YOU LEARNED ACTIVITY 2.1 ON PAGE 14?

Answer 3

Yes

Question 4

Differentiate between homogenous and heterogenous mixtures.

Answer 4

HOMOGENOUS
1. uniform particles
2. size < 1nm
3. can’t see the particles when a beam of light is passed through - no Tyndall effect
4. not filterable
5. stable solution

HETEROGENOUS
1. non-uniform particles
2. size > 1nm
3. can see the particles when a beam of light is passed through - shows Tyndall effect
4. can be filtered

Question 5

What is Tyndall Effect?

Answer 5

Tyndall Effect is a phenomenon in which the path of the beam of light becomes visible due to scattering of particles.