AP Chemistry Unit 4 Review

Front

What is the role of H2O in the reaction NH3 + H2O ↔ NH4+ + OH-?

Back

H2O acts as an acid in this reaction, donating a proton (H+) to NH3.

Front

What is the oxidation number of phosphorus (P) in K3PO4?

Back

The oxidation number of phosphorus (P) in K3PO4 is +5.

Front

What are the coefficients that balance the equation N2 + H2 → NH3?

Back

The coefficients that balance the equation are 1, 3, 2.

Front

What are the coefficients that balance the equation Na + ZnI2 → NaI + Zn?

Back

The coefficients that balance the equation are 2, 1, 2, 1.

Front

What is the net ionic equation for the reaction Fe+3(aq) + 3Cl-(aq) + Na+(aq) + OH-(aq) → Fe(OH)3(s) + Na+(aq) + Cl-(aq)?

Back

The net ionic equation is Fe+3(aq) + OH-(aq) → Fe(OH)3(s).

Front

Define a conjugate acid.

Back

A conjugate acid is the species formed when a base gains a proton (H+).

Front

Define a conjugate base.

Back

A conjugate base is the species that remains after an acid has donated a proton (H+).

Front

What is the difference between a strong acid and a weak acid?

Back

A strong acid completely dissociates in solution, while a weak acid only partially dissociates.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (strongly acidic) to 14 (strongly basic), with 7 being neutral.

Front

What is the principle of conservation of mass in a chemical reaction?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.