Which of the following covalently bonded molecules are polar?
(a)
(b)
(c)
(d)

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Which of the following covalently bonded molecules are polar?
(a)
(b)
(c)
(d)
A chemist, during the course of an analysis, runs across a chemical composed of carbon, hydrogen, and oxygen in the proportion 1:2:1 and having a six-sided molecular shape. It is probably:
a. A pentose
b. An amino acid
c. A fatty acid
d. A monosaccharide
e. A nucleic acid
How many moles of aspirin, C₉H₈O₄, are in a bottle containing 450 g by weight? (Note: The approximate atomic weights of its atoms are C = 12, H = 1, and O = 16.)
Provide the atomic symbol for each of the following elements:
e. Nitrogen
f. Oxygen
g. Potassium
h. Sodium
A deficiency in this element can be expected to reduce the hemoglobin content of blood:
a. Fe
b. I
c. F
d. Ca
e. K
Consider the following information about three atoms: 12/6 C 13/6 C 14/6 C
a. How are they similar to one another?
b. How do they differ from one another?
c. What are the members of such a group of atoms called?
d. Using the planetary model, draw the atomic configuration of 12/6 C, showing the relative position and numbers of its subatomic particles