Question

these are the ones we could not figure out? Are these heterogenous or homogenous ( if homogenous are they solutions or colloids)

lemonade
brass
paint
suntan lotion
stainless steel

Answer 1

Most lemonade is heterogeneous because it has seeds (unless they have been removed) and pulp of the lemon if it is home made. Some brands of lemonade bought commercially and made up to volume are solutions.
Brass is an alloy and homogeneous.
Paint (real paint and not varnish or stain) is heterogenous and it is not in solution.
suntan lotion--I think most of these lotions are not solutions and they are heterogenous but some simple ones are homogeneous and quite thick.
Stainless steel is like brass; it is man made and is homogeneous, or at least the manufaturer hopes it is.
Some may consider paint and suntan lotion colloids because the particles are very small. Without knowing the contents I can't make the call. Another tutor may have specific information.