Question 3
Brass is made by mixing copper and zinc in the proportion 65% and 35%. How is it named?
The right answer is the one marked above.
Solid-solid homogeneous. Both components are solids, and there is no point in the alloy where the composition differs from any other point.
Sugar and salt ground together are also solid and solid, but they stay two separate solids side by side and the grains could be picked apart — which makes that mixture heterogeneous.