Chemistry HESI A2 Quizlet

Questions 70

HESI A2

HESI A2 Test Bank

Chemistry HESI A2 Quizlet Questions

Question 1 of 5

What are the three types of intermolecular forces?

Correct Answer: B

Rationale: The correct answer is B because hydrogen bonding, dipole interactions, and dispersion forces are the three types of intermolecular forces. Hydrogen bonding occurs between molecules with a hydrogen atom bonded to a highly electronegative atom. Dipole interactions arise from the attraction between polar molecules. Dispersion forces are the weakest intermolecular forces and occur due to temporary fluctuations in electron distribution. Choices A, C, and D are incorrect because they do not accurately represent the three specific types of intermolecular forces.

Question 2 of 5

What charge do Group VIA elements typically have?

Correct Answer: B

Rationale: The correct answer is B (-2). Group VIA elements, also known as Chalcogens, have 6 valence electrons. They typically gain 2 electrons to achieve a stable octet configuration, resulting in a -2 charge. Option A (-1) is incorrect because gaining 1 electron would not complete the octet. Option C (-3) is incorrect because gaining 3 electrons is energetically unfavorable. Option D (0) is incorrect because Group VIA elements tend to gain electrons to achieve stability.

Question 3 of 5

What creates a dipole in a covalent bond?

Correct Answer: A

Rationale: The correct answer is A: Unequal sharing of electrons. In a covalent bond, when two different atoms with different electronegativities come together, one atom attracts the shared electrons more strongly than the other, leading to an uneven distribution of electron density. This results in a dipole moment where one end of the bond is slightly positive and the other slightly negative. Choices B, C, and D are incorrect because in covalent bonds, electrons are not fully transferred or exchanged, but rather shared between atoms, leading to the creation of a dipole due to the unequal sharing of electrons.

Question 4 of 5

What are neutral particles called?

Correct Answer: A

Rationale: The correct answer is A: Neutrons. Neutrons are neutral particles because they have no charge, unlike protons (positively charged), electrons (negatively charged), and cations (positively charged ions). Neutrons are found in the nucleus of an atom along with protons, contributing to the atomic mass without affecting the overall charge. This makes them essential for maintaining the stability of the nucleus. Therefore, neutral particles are called neutrons.

Question 5 of 5

What charge do alpha radiation particles have?

Correct Answer: C

Rationale: The correct answer is C: +2. Alpha radiation particles are helium nuclei consisting of 2 protons and 2 neutrons, giving them a charge of +2. This charge is due to the presence of 2 protons, which are positively charged particles. Choice A (-2) is incorrect as alpha particles are positively charged. Choice B (0) is incorrect as alpha particles have a positive charge. Choice D (+1) is incorrect as alpha particles have a charge of +2 due to the presence of 2 protons.

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