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WorksheetsSemester 2 Review - Physical Science
Total questions: 20
Worksheet time: 18mins
What color are the coolest stars?
red
yellow
blue-white
orange
How can astronomers determine a star’s chemical composition?
by using a spectrograph
by looking at its temperature
by comparing its color to the sun
by comparing its size to the sun
A light-year is _____.
the distance light travels in a year
the same as an Earth year: 365 days
the distance from Earth to Proxima Centaur
the amount of light the sun produces in a year
In the Hertzsprung-Russell diagram, most stars are found in the _____ area.
main-sequence
white dwarf
supernova
giants
The Hertzsprung-Russell diagram is used to _____.
classify stars
determine distance of stars
rate brightness
determine temperature of stars
_____ stars can become supernovas.
High-mass
Low-mass
Long-lived
Main-sequence
C6H12O6
Which of the following is a sign that a chemical reaction has occurred?
change in shape
melting
formation of a gas
dissolving
Which is a chemical change?
freezing fruit juice
slicing a potato
boiling water
copper metal turning green
When an atom loses an electron, it becomes a:
positive ion
negative ion
neutral ion
neutral atom
How are covalent bonds explained?
When one atom takes the other atom's electron
When the atom shares an electron with an another atom
When the two nucleus merge
When the neutrons leave the nucleus
How many valence electrons do most atoms need to be stable?
1
2
6
8
Outer shell electrons are called
outer electrons
valence electrons
negatives
Any time Hydrogen bonds with anything, it will bond
Ionically because it has 1 extra electron
Covalently because it only has 1 electron
Metallically because it is on the metal side
Ionic bonds are between...
Metal and Non-metal
Non-metal and Non-metal
Metal and Metal
