Original HESI A2 chemistry practice with written answers. Try the free samples below, then practise every section in the full timed exam.
Chemistry covers matter and its states, atomic structure, the periodic table, chemical bonds and reactions, acids, bases and pH, and introductory stoichiometry. The emphasis is on understanding why a reaction behaves the way it does rather than on heavy calculation, which makes conceptual review the most efficient way to prepare.
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1. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?
Answer: C. Mass number equals protons plus neutrons (17 + 18 = 35).
2. Which of the following elements is a halogen?
Answer: B. Chlorine is in Group 17 of the periodic table, which is the halogen group.
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1. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?
A. 17B. 34C. 35D. 52Answer: C. Mass number equals protons plus neutrons (17 + 18 = 35).
2. Which of the following elements is a halogen?
A. NeonB. ChlorineC. SodiumD. CalciumAnswer: B. Chlorine is in Group 17 of the periodic table, which is the halogen group.
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Chemistry covers matter and its states, atomic structure, the periodic table, chemical bonds and reactions, acids, bases and pH, and introductory stoichiometry. The emphasis is on understanding why a reaction behaves the way it does rather than on heavy calculation, which makes conceptual review the most efficient way to prepare.