Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity

reactivity

Explanation:

a chemical reacting to another chemical is considered a Chemical property because chemicals react with other chemicals differently

It's reactivity is a chemical property since that's not determined by a substance's physical traits.

Explanation:

Boiling, density, and conductivity are all determined by factors that are physical, whereas reactivity is derived from chemical properties.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.