In two or more complete sentences explain how to balance the chemical equation and classify its reaction type. ___H3PO4 + ___NaBr ⟶ ___HBr + ___Na3PO4

Double displacement reaction

Explanation:

Chemical equation:

H₃PO₄ + NaBr      →    HBr + Na₃PO₄

Balanced chemical equation:

H₃PO₄ + 3NaBr      →    3HBr + Na₃PO₄

Step one:

H₃PO₄ + NaBr      →    HBr + Na₃PO₄

On left side of equation                  On right side pf equation

H = 3                                                   H = 1

P =  1                                                    P = 1

O = 4                                                    O = 4

Na = 1                                                   Na = 3

Br = 1                                                     Br = 1

Step 2:

H₃PO₄ + NaBr      →    3HBr + Na₃PO₄

On left side of equation                  On right side pf equation

H = 3                                                   H = 3

P =  1                                                    P = 1

O = 4                                                    O = 4

Na = 1                                                   Na = 3

Br = 1                                                     Br = 3

Step 3:

H₃PO₄ + 3NaBr      →    3HBr + Na₃PO₄

On left side of equation                  On right side pf equation

H = 3                                                   H = 3

P =  1                                                    P = 1

O = 4                                                    O = 4

Na = 3                                                   Na = 3

Br = 3                                                     Br = 3

Type of chemical reaction:

The given reaction is double displacement reaction on which cation and anion of both reactants are replace with each other.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.