Unit 6 Practice Exam (Nuclear Chem)

Front

What is the principle of mass-energy equivalence?

Back

During nuclear reactions, some mass is converted into energy, as described by Einstein's equation E=mc².

Front

What type of radiation has the least penetrating power?

Back

Alpha radiation has the least penetrating power but the greatest ionizing power.

Front

What is the half-life of a radioactive substance?

Back

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

Front

How do you calculate the remaining mass of a radioactive sample after a certain time?

Back

Use the formula: Remaining mass = Original mass × (1/2)^(time elapsed / half-life).

Front

What is the definition of ionizing radiation?

Back

Ionizing radiation is radiation that carries enough energy to liberate electrons from atoms or molecules, thereby ionizing them.

Front

What is the significance of Cs-137 in nuclear chemistry?

Back

Cs-137 is a radioactive isotope commonly used in medical applications and as a tracer in environmental studies.

Front

What is the decay process of a radioactive isotope?

Back

The decay process involves the transformation of an unstable atomic nucleus into a more stable one, releasing energy and particles.

Front

What is the role of a Geiger counter?

Back

A Geiger counter is an instrument used to detect and measure ionizing radiation.

Front

What is the difference between alpha, beta, and gamma radiation?

Back

Alpha radiation consists of helium nuclei, beta radiation consists of electrons or positrons, and gamma radiation consists of high-energy photons.

Front

What is a radioactive decay series?

Back

A radioactive decay series is a sequence of decays that a radioactive isotope undergoes until it reaches a stable isotope.