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HESI A2 Chemistry Practice Questions
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HESI A2
Chemistry
HESI A2 Chemistry Practice Questions
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Question 1 of 25
Which of the following represents a hydride ion?
A. Hâ»
B. Hâº
C. OHâ»
D. HCl
Correct Answer:
Rationale:
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Question 2 of 25
Which substance forms hydroxide ions when placed in water?
A. Lemon juice
B. Battery acid
C. Vinegar
D. Lye
Correct Answer:
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Question 3 of 25
Cobalt-60 has a half-life of 5 years. If you start with 20 g of cobalt-60, how much is left after 10 years?
A. 15 g
B. 10 g
C. 5 g
D. 2.5 g
Correct Answer:
Rationale:
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Question 4 of 25
Which one does not name a polar molecule?
A. NH₃
B. Hâ‚‚S
C. SOâ‚‚
D. COâ‚‚
Correct Answer:
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Question 5 of 25
What happens in a single displacement reaction?
A. A compound decomposes into two substances.
B. An active element displaces a less active element.
C. A precipitate solid forms from the reaction of two solutions.
D. The oxidation states of atoms in the reactants change.
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