John flies directly east for 20km, then turns to the north and flies for another 10 km before dodging a flock of geese. what’s the distance and displacement?

Let a small circle represent an atom of one type of element and a small square represent an atom of a second type of element. make a drawing of (a) a pure substance (a compound) composed of the two elements (in a one-to-one ratio), (b) a homogeneous mixture composed of the two elements, and (c) a heterogeneous mixture composed of the two elements.