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HESI A2 · Chemistry · HESI A2 Chemistry Practice Questions

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

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.

Correct Answer: An active element displaces a less active element.

Question 2 of 5

What is the oxidation state of the potassium ion in the compound KCl?

A. 1

B. -1

C. 2

D. -2

Correct Answer: 1

Question 3 of 5

Balance this equation: Fe + Cl2 Ã¢â€ â€™ FeCl3

A. 2Fe + 2Cl2 Ã¢â€ â€™ 2FeCl3

B. 2Fe + 3Cl2 Ã¢â€ â€™ 2FeCl3

C. 3Fe + 2Cl2 Ã¢â€ â€™ 3FeCl3

D. 3Fe + 3Cl2 Ã¢â€ â€™ 6FeCl3

Correct Answer: 2Fe + 3Cl2 Ã¢â€ â€™ 2FeCl3

Question 4 of 5

What is the charge of a beta particle?

A. -1

B. 1

C. 2

D. No charge

Correct Answer: -1

Question 5 of 5

What distinguishes one allotrope from another?

A. Arrangement of atoms

B. Gram atomic mass

C. Physical state

D. Stability

Correct Answer: Arrangement of atoms

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