Chapter 1, Problem 1.20EP

Correctly complete each of the following sentences by placing the word chemical or physical in the blank.

1. a. Bending glass tubing using a hot flame is a ______ technique.
2. b. The grating of a piece of cheese is a ______ procedure.
3. c. The heating of a blue powdered material to produce a white glassy substance and a gas is a ______ process.
4. d. Wool is spun into yarn using ______ means.