AP Chem Unit 4

Front

What is a net ionic equation?

Back

A net ionic equation shows only the species that participate in a chemical reaction, omitting spectator ions.

Front

What is the significance of a precipitate in a chemical reaction?

Back

A precipitate indicates that a chemical reaction has occurred, resulting in the formation of an insoluble product.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of potassium hydrogen phthalate (KHP) in titrations?

Back

KHP is used as a primary standard to determine the concentration of a sodium hydroxide (NaOH) solution.

Front

How does the presence of water affect the mass of KHP in titrations?

Back

If KHP is not dried, the mass will include water, leading to an overestimation of the NaOH concentration.

Front

What is the balanced equation for the reaction of nitrogen and hydrogen to form ammonia?

Back

N₂(g) + 3 H₂(g) → 2 NH₃(g)

Front

What is the definition of a strong acid?

Back

A strong acid is one that completely dissociates in solution, releasing all of its hydrogen ions.

Front

What is the definition of a strong base?

Back

A strong base is one that completely dissociates in solution, releasing all of its hydroxide ions.

Front

What is the principle behind titration?

Back

Titration is a technique used to determine the concentration of a solution by reacting it with a solution of known concentration.

Front

What is the significance of observing a temperature change during a dissolving process?

Back

A temperature change indicates that a chemical or physical change is occurring, often related to the energy changes in the system.