Make Up Grade Nuclear Chemistry

What is radioactivity?

• The process in which an unstable nucleus changes by emitting particles or releasing energy.

• The process of splitting a nucleus into smaller fragments.

• The combination of light nuclei into a heavier nucleus.

• The emission of light from a stable nucleus.

Which particle has a positive charge and is located in the nucleus?

• Gamma ray

• Proton

• Neutron

• Electron

What is the mass of an electron compared to a proton?

• 0 amu

• 1840 amu

• 1/1840 amu

• 1 amu

What is an isotope?

• Atoms with the same number of electrons but different numbers of protons.

• Atoms with the same number of protons and neutrons.

• Atoms with the same number of neutrons but different numbers of protons.

• Atoms with the same number of protons but different numbers of neutrons.

What is alpha decay?

• A type of decay where a neutron splits into a proton and an electron.

• A type of decay where an atomic nucleus emits an alpha particle.

• A type of decay where a nucleus emits a gamma ray.

• A type of decay where a nucleus absorbs a neutron.

What is the half-life of a radioactive substance?

• The time required for all atoms to decay.

• The time required for one-half of the atoms to undergo decay.

• The time required for a nucleus to emit a beta particle.

• The time required for a nucleus to emit an alpha particle.

What is a decay curve?

• A graph line representing the constant radioactivity over time.

• A graph line representing the decrease of radioactivity with time.

• A graph line representing the increase of radioactivity over time.

• A graph line representing the fluctuation of radioactivity over time.

What is nuclear fission?

• The process in which a light nucleus combines into a heavier nucleus.

• The process in which a nucleus splits into smaller fragments.

• The process in which a nucleus emits a gamma ray.

• The process in which a nucleus absorbs a neutron.

What is a chain reaction?

• A series of beta decay processes.

• A series of fusion processes.

• A series of fission processes where emitted neutrons cause further fission.

• A series of alpha decay processes.

What is nuclear fusion?

• The process in which a nucleus splits into smaller fragments.

• The process in which a light nucleus combines into a heavier nucleus.

• The process in which a nucleus emits an alpha particle.

• The process in which a nucleus emits a beta particle.