CHEM S1 Final Review

Front

What is the definition of an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How do you calculate the number of neutrons in an isotope?

Back

Subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons).

Front

What is the half-life of a substance?

Back

The half-life is the time required for half of the quantity of a radioactive substance to decay.

Front

How many seconds are in one day?

Back

86,400 seconds.

Front

What is nuclear fission?

Back

Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts, releasing a large amount of energy.

Front

What is nuclear fusion?

Back

Nuclear fusion is a process where two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the formula to calculate the remaining quantity of a substance after a certain number of half-lives?

Back

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

Front

What is the significance of Bromine-82 in environmental studies?

Back

Bromine-82 is used as a tracer for organic material due to its radioactive properties and half-life.

Front

How do you convert days to seconds?

Back

Multiply the number of days by 86,400 (the number of seconds in one day).

Front

What is the mass number of an isotope?

Back

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