The students determined that a new substance formed and a chemical reaction took place. Which pieces of evidence from their observations best support this conclusion? Group of answer choices

substance dissolves, precipitate forms, color changes

color changes, temperature changes, precipitate forms

state change occurs, gas is released, substance dissolves

temperature changes, production of a gas, color changes

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.