Chemistry HESI A2 Quizlet

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.

Correct Answer: B

Rationale: The correct answer is B: Double replacement. In this type of reaction, two ionic compounds swap ions to form two new compounds. The cations and anions switch partners, leading to the formation of two different ionic compounds. This process is also known as metathesis. Single replacement (A) involves an element replacing another in a compound. Synthesis (C) involves the combination of two or more substances to form a single compound. Decomposition (D) involves a single compound breaking down into simpler substances. Double replacement is the only option where two ionic compounds exchange partners, making it the correct choice in this scenario.

Correct Answer: A

Rationale: The Group VIIA elements, also known as the halogens, have a charge of -1. This is because they require one additional electron to achieve a stable octet configuration, making them highly reactive nonmetals. The correct answer is A (-1) because halogens readily gain one electron to fill their outer energy level. Choices B (-2) and D (1) are incorrect because the charge of Group VIIA elements is typically -1, not -2 or +1. Choice C (0) is incorrect because Group VIIA elements do not have a charge of 0; they have a tendency to gain an electron rather than lose one.

Correct Answer: C

Rationale: Group IIIA elements have 3 valence electrons, which they tend to lose to achieve a stable octet electron configuration. By losing 3 electrons, they acquire a +3 charge. This is why the correct answer is C. Choice A is incorrect because Group IIIA elements do not typically gain electrons to have a +1 charge. Choice B is incorrect as they don't lose 2 electrons to have a +2 charge. Choice D is incorrect as they do not gain or lose electrons to have a charge of 0.

Correct Answer: B

Rationale: The correct answer is B: Weak. Dipole attraction is a type of intermolecular force where polar molecules are attracted to each other due to the positive and negative ends of their dipoles. This force is relatively weaker compared to other intermolecular forces like hydrogen bonding or ion-dipole interactions. It is weaker because it only involves the partial charges on molecules and not full charges like in ionic interactions. Choices A, C, and D are incorrect because dipole attractions are not as strong as those intermolecular forces that involve full charges or hydrogen bonding.