When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid a. has no observable changes. c. evaporates. b. boils vigorously. d. begins to boil.

the answer is a

Explanation:

passed this course

When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid begins to boil.

Option - d

Explanation:

The pressure on the liquid reduces the quantity of pressure on liquid caused by the atmosphere. The liquid becomes vapor and mixes in the air. The water begins to boil when the vapor pressure of a liquid is equal to the atmospheric pressure.

Whenever the vapor pressure equals the atmospheric pressure, the liquid starts to boil. In effect, the liquid molecules gain the ability to get distributed and convert from liquid to gaseous phase without any external pressure. The gas which exists as bubbles in the liquid, will get raised outward on the surface and get released into the atmosphere.

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

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.