Identify the type of phase change described in each process. Molten aluminum poured into a mold cools to form a solid object. A block of dry ice gradually becomes foglike at room temperature. A soldering iron prepares liquid solder from solid metal. The cap is left off a bottle of acetone and the smell fills the room. A scoop of ice cream begins to drip in the hot sun. A drop of mercury on the lab bench disappears over time. Beads of water form on a cold drinking glass.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e