Which of the following best describes the product of precipitation reaction?

a. two soluble compounds
b. a solvent and solute
c. a soluble compound and in insoluble compound
d. two insoluble compounds

The formation of a soluble compound and an insoluble compound best describes the product of precipitation reaction.

Option C

Explanation:

A precipitation reaction, a type of chemical reaction where an insoluble compounds will be obtained from a solution of two soluble compounds after applying an external force. This force can be in the form of heat or shaking etc. So the two soluble components in the reactant solution will react with each other forming new compounds.

One of the new compounds formed should be in insoluble in the solution forming a layer of solid powder at the bottom which is termed as precipitate. So this is termed as precipitate reaction where the product compounds must contain a soluble compound forming the solution and an insoluble compound forming the precipitate in the solution.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid