Quantum and Nuclear Chemistry Test

The diagram shows the nucleus of uranium-235 being split into several pieces. Name the process shown in the diagram.

• nuclear fission

• nuclear fusion

• chemical reaction

• chain reaction

This image is an illustration of

• photoelectric effect
• Dalton's atomic theory
• Bohr model
• Quantum mechanical model

Which process involves the joining of small nuclei?

• Beta decay
• Alpha decay
• Nuclear fission
• Nuclear fusion

The time taken for half of an amount of radioactive atoms to decay.

• Nuclear fusion
• Full-life
• Dead time
• Half-life

The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?

• 33.0 mg
• 12.5 mg
• .33 mg
• 15.8 mg

What happens to the atomic number (number of protons) during alpha decay?

• The atomic number decreases by 4

• The atomic number increases by 1

• The atomic number decreases by 2.

• The atomic number stays the same.

What happens when the number of protons in an atom changes? 

• The number of electrons changes too 
• Usually nothing happens, unless the atom is radioactive 
• The atomic nucleus explodes
• It becomes a completely different atom, with different properties 

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Sodium

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Helium

the diagram show

• the formation of continous spectrum

• the formation of line spectrum