Which of the following represents an element?
A) HF
B) Se
C) F2
D) CO2
Correct Answer:
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Q64: _ are pure substances.
A)Homogeneous mixtures and elements
B)Elements
Q74: What is the chemical symbol for iron?
A)Fe
B)I
C)In
D)Ir
Q77: What is the chemical symbol for iodine?
A)I
B)Id
C)In
D)Io
Q77: Which of the following CANNOT be the
Q80: What is the chemical symbol for chromium?
A)C
B)Cr
C)Ch
D)Cm
Q83: The prefix giga means _.
A)1,000
B)1,000,000,000,000
C)1,000,000
D)1,000,000,000
Q83: The prefix kilo means _.
A) 10-9
B) 10-6
C)
Q92: The prefix centi means _.
A)1/1,000
B)1/100
C)1/10
D)100
Q95: How many micrograms are in 20 mg?
A)20,000
Q96: The prefix milli means _.
A)0.000001
B)0.001
C)0.1
D)1000
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