A student observes ice forming on the edge of a school building. At what temperature did the water outside the school building most likely begin to change to ice?

The temperature at which a substance changes from liquid to gas (for water this is 100 degrees Celsius, 212 degrees Fahrenheit)

A student made a mixture using equals amounts of salt and pepper. The salt grains were the same size as the pepper grains. What should the student do to most easily separate the pepper from the salt?

A mixture of beads was placed in a container, as shown below. The beads are of various sizes, and each one is made of plastic, glass or steel. The mixture would be easy to separate because all the beads....