AP Chemistry - Unit 4 - Thou Shall Not Forget

Front

What is a double replacement reaction?

Back

A chemical reaction where two compounds exchange ions to form two new compounds.

Front

Define a limiting reactant.

Back

The reactant that is completely consumed in a chemical reaction, limiting the amount of product formed.

Front

What is a physical change?

Back

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

Front

What does it mean for a substance to be diatomic?

Back

A diatomic molecule consists of two atoms, which can be of the same or different elements.

Front

What is a redox reaction?

Back

A reaction involving the transfer of electrons between two species, resulting in changes in oxidation states.

Front

Explain the significance of subscripts in chemical formulas.

Back

Subscripts indicate the number of atoms of each element in a compound; for example, H2O has 2 hydrogen atoms and 1 oxygen atom.

Front

What is the difference between an aqueous solution and a solid precipitate?

Back

An aqueous solution is a homogeneous mixture where substances are dissolved in water, while a solid precipitate forms when certain ions in solution react to create an insoluble compound.

Front

What is the role of coefficients in a balanced chemical equation?

Back

Coefficients indicate the relative amounts of reactants and products involved in a chemical reaction.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is a combustion reaction?

Back

A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.