Answer
b. and d.
Work Step by Step
a. Solid butter has a uniform texture and composition, so it is a homogeneous mixture.
b. A Snickers bar has a heterogeneous composition that you can observe; therefore, it is a heterogeneous mixture.
c. Grape juice is a homogeneous mixture because it looks uniform.
d. An uncooked hamburger doesn't have a homogeneous look to it, so it is a heterogeneous mixture.
