How did the experiement with boiling water compare with the experiment in which magnesium was added to hydrochloric acid? both resulted in gas formation. both resulted in temperature change. both involved chemical change. both involved physical change. one involved chemical change while the other involved physical change.

Answer is:

Both resulted in gas formation.

Both resulted in temperature change.

One involved chemical change while the other involved physical change.

1) Balanced chemical reaction of magnesium and hydrochloric acid:

Mg + 2HCl → MgCl₂ + H₂(g).

Hydrogen(H₂) is a gas. This is exothermic reaction (energy is released). This is chemical change, new substances are formed.

2) Boiling water is physical change, no new substances are formed. This is endothermic reaction, heat is added. Steam is gas.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8