In the equation: #A + B -> C+D#, what are A and B?

3 Answers
Jun 12, 2017

Answer:

Reactants

Explanation:

In a chemical equation you have

Reactants #rarr# Products

The reactants are the compounds which react to make the products.

Jun 12, 2017

Answer:

#A# and #B# are called the reactants of the chemical reaction.

Explanation:

For any chemical reaction, we write the chemical equation with the #sfcolor(red)("reactants"# on the #sfcolor(red)("left side"#, the #sfcolor(blue)("products"# on the #sfcolor(blue)("right side"#, and the reaction arrow between them, pointing most often to the right, to indicate that the reaction progresses from reactants to products.

[In the case where the reaction progresses to a state of equilibrium, you'll often see the arrow pointing in both directions (#rightleftharpoons#) to indicate that the rate of the forward reaction (reactants form the products) is the same as the rate of the reverse reaction (products form the reactants)].

Jun 12, 2017

Answer:

#"Reactants" => "Products"#

Explanation:

#underbrace("A+B")_ "Reactants" => underbrace("C+D") _"Products"#

Example: for mass/mass calculations in equations...

#2Mg^o(s) + O_2(g) => 2MgO(s)#

#underbrace( overbrace("45.0 g")^(color(blue)("mass of Mg")) + overbrace(?color(white)(.)"g")^(color(blue)("mass of O"_ 2)))_ (color(purple)("the mass of the reactants")) => underbrace( overbrace("74.62 g")^(color(blue)("mass of MgO")))_ (color(purple)("the mass of the product"))#*

(*Underbrace formatting from Stefan V post.)