A science teacher gave a student a sample of a clear liquid labeled "unknown substance." which property would best help the student determine the sample's identity? a. the sample's boiling point

b. the sample's volume

c. the sample's weight

d. the sample's mass

The sample boiling point

Explanation:

I 'm taking the test it's right

Reaction Given:

___H₃PO₄ + ___NaBr ⟶ ___HBr + ___Na₃PO₄

Balance Equation = ?

Type of reaction =?

Solution:

Balance Chemical Equation:

A balanced chemical equation is that in which the number of the reactant atoms equal to the number of the product atom.

For example if the hydrogen at the reactant side is 3, the number of hydrogen must be 3 on the product side.

Check the chemical equation and count the number of atoms at the reactant side and product side.

If the number of atoms of the reactants equal to the number of atoms of products then the reaction is balanced but if not equal, then reaction is not balanced

Balancing is an trial and error process to get a balance reaction.

First we count the number of atoms of reactant and product

Number of atoms of Reactant:

H = 3

P = 1

O = 4

Na = 1

Br = 1

Number of atoms of Product:

H = 1

P = 1

O = 4

Na = 3

Br = 1

So this is not a balance equation as the atoms of the reactant atoms not equal to the number of the product atoms.

As there are 3 hydrogen, and 1 sodium atom at reactant side but 1 hydrogen atom and 3 sodium atoms at the product side so we balance this along with other

Balanced Equation:

H₃PO₄ + 3 NaBr ⟶ 3 HBr + Na₃PO₄

Now count the number of atoms of reactant and product

Number of atoms of Reactant:

H = 3

P = 1

O = 4

Na = 3

Br = 3

Number of atoms of Product:

H = 1

P = 1

O = 4

Na = 3

Br = 1

Now this reaction is balanced as the atoms of the reactant atoms equal to the number of the product atoms.

So, the Coefficient of NaBr and HBr is 3 in balanced equation

Type of Reaction:

This is a double displacement reaction, in which hydrogen (H) of the first compound replaces the Sodium (Na) of the other compound or and Phosphate (PO₄) of the first compound replaces the bromine (Br) of the other compound. Two molecules or compounds combine and produce two other molecules or compound different from reactants.

Reaction Type = Double displacement