Physical Science - Long Quiz

Which process is primarily responsible for the formation of heavier elements in stars?

• Nuclear fission

• Nuclear fusion

• Radioactive decay

• Electron capture

In the life cycle of a star, where does the majority of heavy element formation occur?

• During the main sequence phase

• In the red giant phase

• During a supernova explosion

• In the white dwarf phase

What is the primary fuel for nuclear fusion in the core of most stars?

• Helium

• Carbon

• Hydrogen

• Oxygen

The process of creating new elements in a laboratory is called:

• Elemental synthesis

• Atomic transmutation

• Nuclear fusion

• Artificial element creation

Which particle is added to an atom to increase its atomic number?

• Neutron

• Proton

• Electron

• Positron

The discovery of the atomic number led to a better understanding of:

• Isotopes

• The periodic table

• Chemical bonding

• All of the above

A molecule is considered polar if:

• It has an even distribution of charge

• It has an uneven distribution of charge

• It contains only nonpolar bonds

• It has no dipole moment

Which of the following molecules is polar?

• CCl4

• CO2

• H2O

• CH4

The polarity of a molecule is determined by:

• The number of atoms in the molecule

• The electronegativity differences between atoms and molecular geometry

• The total number of electrons in the molecule

• The molecular mass

Which property is most likely to be affected by the polarity of a molecule?

• Density

• Solubility in water

• Atomic mass

• Number of neutrons