PHYSICAL SCIENCE SUMMATIVE TEST

Where do hydrogen and helium fuse in a main sequence star?

• core

• crust

• inner core

• mantle

In the triple-alpha process, stars fuse together three alpha helium particles, creating a new element. Which of the following element is formed?

• Argon

• Chlorine

• Carbon

• Oxygen

When a star has used up all the hydrogen in its core, hydrogen will be converted into helium in the layer immediately surrounding the core. What stage of star formation is this?

• Protostar

• Red giant

• Supernova

• White dwarf

What type of nuclear reaction emits a particle with two protons and two neutrons?

• Alpha emission

• Beta emission

• Gamma emission

• Fusion

When the fragments of clouds contract, a stellar core known as _________ is formed.

• protostar

• red giant

• supernova

• white dwarf

Which of the following will be the solvent if a nonpolar substance dissolves in an unknown liquid?

• ionic

• non-polar

• polar

• water

Which of the following is an example of a non-polar molecule? 

• H₂O

• N₂

• ClBr3

• SO₂

Which of the following is a common structure of a non-polar molecule?

• bent

• trigonal pyramidal

• linear

• trigonal planar

Which of the following is an example of a polar molecule? 

• HCl

• BF3

• CCl4

• XeF4

Which of the following is TRUE about the boiling point of polar molecules?

• Generally high boiling point

• Generally low boiling point

• Boiling point cannot be determined

• Similar non-polar molecules