Ozone
A. is a molecule consisting of two oxygen atoms and a hydrogen atom.
B. is a molecule consisting of three oxygen atoms.
C. is a molecule consisting of two oxygen atoms and a nitrogen atom.
D. is an element.
Answer: B
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The center spot of Newton's rings is dark. This destructive interference occurs because:
a. the two beams travel distances that are different by half a wavelength. b. both waves change phase by 180° as they are reflected. c. one beam changes phase by 180° when it is reflected. d. both waves have a trough.
Mountains characterized by folded rock strata are known as ______________ mountains
Fill in the blank(s) with correct word
The temperature coefficient of resistivity is a quantity that is:
a. always positive. b. always non-negative. c. sometimes negative. d. represented by the symbol ?.
A watermelon is a good example of
a. a compound. b. an element. c. a homogeneous mixture. d. a heterogeneous mixture.