Help!! Which of the following is a chemical reaction?

a. New atoms are formed when substances are mixed together
b. A solid material melts and becomes a liquid
c. Atoms of the reactants rearrange to form a new substance

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.