An example of a grad-school level question?
A student is asked to bring something that feels rough to class. Which would be BEST for him to bring?

An example of a grad-school level question?
The elements sulfur (S) and oxygen (O2) combine to form a substance called sulfur dioxide (SO2). Sulfur dioxide is also formed when coal and oil are burned. Sulfur dioxide can best be described as

An example of a grad-school level question?
Which of the following is a characteristic of all chemical changes?

An example of a grad-school level question?
What form of energy causes an ice cube to melt?