Identify the phase transition occurring in each of
the following:

a) The water level in an aquarium tank falls continu-
ously (the tank has no leak).

b) A mixture of scrambled eggs placed in a cold vacuum
chamber slowly turns to a powdery solid.

c) Chlorine gas is passed into a very cold test tube where
it turns to a yellow liquid.

d) When carbon dioxide gas under pressure exits from a
small orifice, it turns to a white “snow.”

e) Molten lava from a volcano cools and turns to solid rock.

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Water is important for the of cells. a: size, shape, and temperature b: temperature, color, and odor c: color, odor, and size d: shape, temperature, and color

What is the mass of 4 molecules of co2