Question

1. choose the best answer.

bubbles are formed to indicate this type of product has formed.
○ solid
○ gas
○ liquid

1. choose the best answer.

the following chemical equation shows the formation of silver chloride.
agno₃(aq) + fecl₃(aq) → agcl(s)+
which compound could represent the missing product?
○ fe(no₃)₃(aq)
○ fecl(aq)
○ feo₂(aq)
○ no₃fe(aq)

Explanation:

Question 5

Bubbles in a reaction typically indicate the formation of a gas, as gases escape as bubbles in liquid or solid - liquid reactions. Solids form precipitates and liquids don't form bubbles as an indicator of their formation.

Step1: Identify the reaction type

This is a double - displacement reaction. In a double - displacement reaction, the cations and anions of the two reactants switch places. The general form is \(AB + CD
ightarrow AD+CB\).
For the reaction \(AgNO_{3}(aq)+FeCl_{3}(aq)
ightarrow AgCl(s)+\text{missing product}\), the cation of \(AgNO_{3}\) is \(Ag^{+}\) and the anion is \(NO_{3}^{-}\); the cation of \(FeCl_{3}\) is \(Fe^{3 + }\) and the anion is \(Cl^{-}\).

Step2: Determine the products

When they switch places, \(Ag^{+}\) combines with \(Cl^{-}\) to form \(AgCl(s)\) (as given), and \(Fe^{3+}\) should combine with \(NO_{3}^{-}\).
The formula for the compound formed from \(Fe^{3+}\) and \(NO_{3}^{-}\) is \(Fe(NO_{3})_{3}\) because the charge of \(Fe^{3+}\) is \(+ 3\) and the charge of \(NO_{3}^{-}\) is \(-1\). To balance the charges, we need 3 \(NO_{3}^{-}\) ions for each \(Fe^{3+}\) ion, so the formula is \(Fe(NO_{3})_{3}\). Also, since \(Fe(NO_{3})_{3}\) is soluble in water (based on solubility rules for nitrates), it will be in the aqueous state (\(aq\)).

Answer:

B. gas

Question 6