AP Chemistry Unit 4

Front

What is a chemical reaction?

Back

A process that involves the transformation of one or more substances into different substances, characterized by the breaking and forming of chemical bonds.

Front

What is the evidence of a chemical reaction occurring?

Back

Common evidence includes color change, gas production (bubbles), temperature change, and the formation of a precipitate.

Front

Define oxidation in terms of electron transfer.

Back

Oxidation is the process in which a substance loses electrons, resulting in an increase in oxidation state.

Front

Define reduction in terms of electron transfer.

Back

Reduction is the process in which a substance gains electrons, resulting in a decrease in oxidation state.

Front

What is the oxidation number of an element in its elemental form?

Back

The oxidation number of an element in its elemental form is 0.

Front

What is the oxidation number of oxygen in most compounds?

Back

The oxidation number of oxygen in most compounds is -2.

Front

What is the oxidation number of hydrogen in most compounds?

Back

The oxidation number of hydrogen in most compounds is +1.

Front

What is the balanced equation for the reaction of zinc with hydrochloric acid?

Back

Zn + 2HCl → ZnCl2 + H2.

Front

How do you calculate percent yield in a chemical reaction?

Back

Percent yield = (actual yield / theoretical yield) x 100%.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.