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 balanced net ionic equation for the reaction between lead(II) nitrate and potassium bromide?

Back

Pb²⁺(aq) + 2 Br⁻(aq) → PbBr₂(s)

Front

What is the balanced net ionic equation for the reaction between lithium and water?

Back

2 Li(s) + 2 H₂O(l) → 2 LiOH(s) + H₂(g)

Front

What is oxidation in a chemical reaction?

Back

Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.

Front

What is reduction in a chemical reaction?

Back

Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change results in the formation of one or more new substances with different properties.

Front

How can you determine if a chemical change has occurred?

Back

Indicators include color change, temperature change, gas production, or the formation of a precipitate.

Front

What is the significance of measuring electrical conductivity in a solution?

Back

Measuring electrical conductivity can indicate whether ions are present in a solution, which helps determine if a chemical change occurred.

Front

What is the law of conservation of mass?

Back

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