How do small stars die? About how large are their remnants?
A. They become white dwarfs, about the size of the Earth.
B. They go supernova, then form neutron stars about the size of a country.
C. They become black holes, about the size of a marble.
D. They go nova, then form black holes about the size of a person.
E. They become neutron stars, about the size of a city.
Answer: A. They become white dwarfs, about the size of the Earth.
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The overall dimming of starlight passing through dust clouds is called ________
Fill in the blank(s) with correct word
A person claims to have been abducted by aliens and subjected to painful medical procedures that left scarring. However, he refuses to allow interested scientists to study his scars. This is an example of
A) hypothesis-driven science B) discovery science C) nonscience D) pseudoscience
Group characteristics - Lewis symbol
The Lewis symbol 
would be characteristic of which group?
a. 2A
b. 4A
c. 3A
d. 5A
What best describes what happens when an acid such as HCl is mixed with water?
A) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. B) A proton from the chlorine nucleus is ejected and captured by a water molecule to form a negatively charged HCl and a new hydronium ion. C) A hydroxide ion from the water is transferred to the HCl molecule to form a proton and hydronium ion. D) HCl is not an acid. E) none of the above