Which element forms the backbone of organic molecules?
A) magnesium
B) iron
C) chlorine
D) sodium
E) carbon
Correct Answer:
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Q51: Identify and compare the properties of the
Q52: A chemical formula shows the types and
Q53: What is the approximate pH of ammonia?
A)
Q54: The tetrahedron shape of a methane molecule
Q55: Which substance is an example of a
Q57: The valence shell of hydrogen or helium
Q58: A liquid with a pH of 7
Q59: Explain how the number and arrangement of
Q60: What is the purpose of a buffer?
A)
Q61: Match the term with its description.
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