instruction:
Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.
question:
Fact: an exothermic reaction increases the amount of heat
answer:
A person puts a potato in some embers on the edge of a campfire and the potato gets hot. The embers are?

question:
Fact: refraction causes something to look different
answer:
A shoe seems gold and green at first, then at second glance looks blue and silver. This could be due to?

question:
Fact: An example of a mixture is clay mixed together
answer:
An example of a mixture is?