Which is the stronger acid: H-F or H-I?
A) H-F, because the electronegativity of fluorine is higher than that of iodine making the H-F bond more polar and more likely to release the hydrogen ion to solution.
B) H-F, because acid strength for binary acids decreases down the group of the periodic table.
C) H-I, because iodine releases the hydrogen in order to form (s) at room temperature.
D) H-I, because the H-I bond is weaker and so it is easier to break to form hydrogen ions.
Question 2
Which of the following represents a chemical change?
A) sugar dissolving into hot coffee
B) ice melting to form liquid water
C) water boiling to form steam
D) steel turning to rust in salt air
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