Substance a and b are chemically exactly the same. the molecules in substance a move much faster and are less ordered than the molecules in substance b, which vibrate slowly and are arranged in an fixed, orderly, regular array. which statement could be true?
substance a is a liquid, while substance b is a liquid or gas.
substance a is a solid, while substance b is a liquid or gas.
substance a is a liquid or gas, while substance b is a solid.
substance a is a liquid or gas, while substance b is a gas.

Substance A is a liquid or gas, while substance B is a solid.

C

Explanation

The real world is made up of matters which can be classified into four types based on their condensed state. They are solid, liquid, gas and plasma.

Basically the matter is classified as solid, liquid and gases only.

Solid are the substance which have orderly arranged atoms and the most condensed state, the molecules vibrate very slowly in a solid molecule.

So this is matching with the properties given for Substance B.

The properties of other substance A is stated as less ordered and more vibrational frequency or we can say that molecules in substance A can travel faster than the molecules of substance B.

This can possible only when the substance A is either liquid or gas.

Because liquid or gas molecules have loosely arranged atoms compared to solid and they are the ones whose molecules can run faster compared to solid.

So substance A can be a gas or a liquid, while substance B is a solid.

dynamic equilibrium is the answer.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.