A. 1 only, B. 2 only, C. both, D. neither
1-29-2. Consider the pictorial representation shown below for a process at the atomic/molecular level. Which process does not involves a chemical change?
1-29-3. Which of the pictorial representations best accounts for the conversion of water from liquid to steam?
1-29-4. Which of the following observations is a definite sign that a chemical change has occurred?
A. Mixing a blue-colored liquid with a yellow-colored liquid, yields a green-colored mixture.
B. Mixing a blue-colored liquid with a colorless liquid yields a yellow-colored liquid
C. Neither
D. Both
1-29-5.Which of the following observations implies that a chemical change has definitely not occurred?
A. Mixing two colorless liquids yields a colorless liquid.
B. A piece of paper, held next to a flame, catches fire and leaves a black residue.
C. Both
D. Neither
