Review in Physical Science 11

Which is the first stage of a star’s life cycle?

• black hole

• nebula

• protostar

• white dwarf

In main sequence star, Hydrogen fuses and converted to Helium. What element is produced from Helium gas at its core?

• C

• Fe

• Ne

• Si

How is the energy of star produced?

• combustion

• decomposition

• Nuclear Fusion

• Nuclear Fission

When does a star become unstable

• When it runs out of fuel.

• When it contracts and expands.

• When its cores is converted to Iron.

• When the outer shell of star is pulled by the gravity from the center.

This is known as the origin and production of heavy elements.

• Stellar Nucleosynthesis

• Primordial Nucleosynthesis

• S-Process

• Supernova Nucleosynthesis

It was created by bombardment of molybdenum by deuterons (heavy hydrogen, H12), by Emilio Segre and Carlo Perrier in 1937.

• Oxygen

• Helium

• Technetium

• Uranium

In this process there’s a buildup of a VERY heavy isotope, then as beta-decays occur, you march up in atomic number and produce heavy product.

• S-Process

• R-Process

• Nuclear Fission

• Nuclear Fusion

It is a one-dimensional point which contains a huge mass in an infinitely small space.

• Nucleosynthesis

• Dilation

• Singularity

• Supernova

.  ____ refers to the ability of an atom in a molecule to attract shared electrons.

• Electron affinity

• Electronegativity

• Ionization energy

• Electromotive force

Which of the following statements is TRUE about polar bonds?

• They are present in metals.

• They are responsible for the formation of ionic compounds.

• They always result to the formation of polar molecular compounds.

• They may result to nonpolar covalent compounds depending on molecular geometry.