CBA 2 (Acids/Bases, Pure vs Mixtures, LOCM, Properties of Water

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a chemical reaction and has a pH less than 7.

Front

What is a base?

Back

A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) in a chemical reaction and has a pH greater than 7.

Front

Define a pure substance.

Back

A pure substance is a material that has a constant composition and consistent properties throughout, such as elements and compounds.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties.

Front

Differentiate between homogeneous and heterogeneous mixtures.

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have visibly different substances or phases (e.g., salad).

Front

What does the Law of Conservation of Mass state?

Back

The Law 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.

Front

What is the pH scale?

Back

The pH scale is a measure of how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What does a pH of 7 indicate?

Back

A pH of 7 indicates a neutral solution, meaning it is neither acidic nor basic.

Front

What is the significance of the number in chemical formulas, such as the '3' in 4NH3?

Back

The '3' in 4NH3 is a subscript indicating that there are three hydrogen atoms in each molecule of ammonia.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another, involving the breaking and forming of bonds.