Exam #2 Chemistry

Q. 

In which process does a heavy nucleus split into two lighter nuclei?

• Freezing

• Condensation

• Fission

• Fusion

Which is a finding attributed to Rutherford's Gold Foil Experiment?

• atoms are dense, solid, and indivisible

• atoms are mostly empty space with a dense positive nucleus.

• atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

• atoms are indivisible and have a dense positive nucleus.

What is the mass number defined as?

• the number of neutrons

• the number of protons

• the number of protons and electrons

• the number of protons and neutrons

Select the correct order of waves on the EMS from the longest wavelength to the shortest wavelength

• Gamma, X-Ray, Ultraviolet, Visible, Infrared, Microwave, Radio.

• Radio, Microwave, Infrared, Visible Light, Ultra Violet, X-Ray, Gamma.

• Microwave, Radio, Visible, Infrared, Ultraviolet, X-Ray, Gamma.

• Gamma, X-Ray, Ultraviolet, Visible, Infrared, Microwave, Radio.

What type of orbital is shown in the picture?

• s

• p

• d

• f

Light is emitted when electrons

• move from a lower energy level to a higher energy level.

• move from one atom to another.

• collide with one another, releasing energy.

• move from a higher energy level to a lower energy level.

As you move down the periodic table in a group, what happens to atomic radius and why?

• Atomic radius increases because you have fewer protons but more electrons.

• Atomic radius stays the same because you only count the nucleus in the radius.

• Atomic radius increases because you increase the number of energy levels.

• Atomic radius decreases because groups go left to right.

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals

• alkaline earth metals

• noble gases

• halogens

What does the number 238 represent in Uranium - 238

• that the element is radioactive

• the atomic number

• the atomic mass

• the mass number

In nuclear fission, the nucleus...

• fuses to form a heavier nucleus with the release of energy.

• splits up with the release of energy.

• heats up until it burn.

• accepts electrons with the release of energy.