1. In the above reaction, the reactants are
and

PLZZ like it tuk me to long to explan

Explanation:

The reaction between zinc and sulfur can be shown in what is called a chemical equation .  In words, we could write the reaction as:

zinc + sulfur → zinc sulfide

The more convenient way to express a chemical reaction is to use the symbols and formulas of the substances involved:

Zn + S → ZnS

The substance(s) to the left of the arrow in a chemical equation are called reactants.  A reactant is a substance that is present at the start of a chemical reaction.  The substance(s) to the right of the arrow are called products .  A product is a substance that is present at the end of a chemical reaction.  In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.

There is a standard way of writing chemical equations.  The reactants are all written on the left-hand side of the equation, with the products on the right-hand side.  An arrow points from the reactants to the products to indicate the direction of the reaction:

reactants → products

When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance.  The symbol “Δ” is often used to indicate that the reaction is to be heated.

The presence of the arrow also indicates that the reaction goes in one direction under the conditions indicated.  There are reactions which can be easily reversed, but we will not take those up right now.

There are a wide variety of reactions possible: elements may form compounds (as seen in the reaction above), compounds may form elements (water will break down in the presence of an electric current to form hydrogen gas and oxygen gas) or compounds may combine, break apart, or rearrange to form new materials.

c most likely

hop this let me know if it is wrong

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.