Answer:
(B) chemical equation
Step-by-step explanation:
Chemical equation is a representation of how reactant form products using chemical symbols.
The reactant are usually in the left hand side of the equation, while the products are kept at the right hand side of the equation. A long arrow is placed in-between them to indicate the direction of the reaction. Some chemical reactions requires number to balance the amount of reactant and products in the equation since law of conservation of matter must be strictly adhered to. Eg
NaOH + HCl ———》 NaCl + H2O