Question

1 what's the Tyndall Effect and whats one example of this effect?

2) Given an unknown mixture consisting of two or more substances, how could we determine whether that mixture is a true solution, a colloid, or a suspension?
3) why is a suspension considered a heterogenous mixture?

Answer 1

Smoke is another colloid with the Tyndall effect.
http://silver-lightning.com/tyndall/

Here is something on suspensions.
http://en.wikipedia.org/wiki/Suspension_(chemistry)