Chemistry Exam Review #1

Front

What is half-life?

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

How do you calculate the remaining amount of a radioactive substance after a certain number of half-lives?

Back

Remaining amount = Initial amount × (1/2)^(number of half-lives).

Front

What is the pH scale?

Back

A logarithmic scale used to specify the acidity or basicity of an aqueous solution.

Front

What is the relationship between pH and [H+] concentration?

Back

[H+] = 10^(-pH).

Front

What type of bond is formed when two atoms share electrons?

Back

A covalent bond.

Front

What is an ionic bond?

Back

A chemical bond formed between two ions with opposite charges.

Front

What are isotopes?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the mass number of an isotope?

Back

The total number of protons and neutrons in the nucleus of an atom.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed.

Front

What is a potential energy diagram?

Back

A graphical representation of the energy changes during a chemical reaction.