Which statement best describes the equation caco3 + 2hcl → cacl2 + co2 + h2o?
a. caco3 is a reactant; it is present before the reaction occurs.
b. cacl2 is a reactant; it is present before the reaction occurs.
c. co2 is a reactant because it is most likely a gas.
d. h2o is a reactant because it is most likely a liquid.

Option (A) is the correct answer.

Explanation:

It is known that while writing a chemical reaction equation, reactants are written on left hand side whereas products are written on right hand side.

For example,

Here, both and HCl are the reactants whereas , and are the products.

Hence, we can conclude that the statement is a reactant; it is present before the reaction occurs, best describes the given equation.

idk

explanation:

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: