“Ingredients” or substance present at the start of a chemical reaction are called? Group of answer choices

coefficients

reactants

products

yields

reactants

Explanation:

The ingredients or materials present at the start of a chemical reaction are called the reactants.

Reactants are species that combines at the start of a reaction to give a product.

For example:

     A + B →   C

A and B are the reactants

C is the product of the reaction

 Therefore, every specie on the left hand side of the reaction are the reactants on the those on the right hand side are the products.

8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right

explanation:

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.