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: Ionic & covalent. Ionic bonding involves the transfer of electrons between atoms, resulting in the formation of positive and negative ions. Covalent bonding involves the sharing of electrons between atoms. These two types of bonding are distinct in their electron behavior and resulting bond strength. Choice A is incorrect as hydrogen bonding is a type of intermolecular force, not a primary chemical bond. Choice C is incorrect as hydrogen bonding is not a primary chemical bond and ionic bonding involves the transfer of electrons, not hydrogen atoms. Choice D is incorrect as metallic bonding involves the sharing of electrons in a sea of electrons, not between specific atoms.

Correct Answer: C

Rationale: The correct answer is C: 3. In a triple covalent bond, 3 electron pairs are shared between two atoms. This results in the sharing of a total of 6 electrons, forming a strong bond. Each bond consists of one sigma bond and two pi bonds. Option A (1) is incorrect as a single bond involves one electron pair, while option B (2) is incorrect as a double bond consists of 2 electron pairs. Option D (4) is incorrect because a triple bond only involves 3 electron pairs being shared.

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: D

Rationale: Dispersion forces are the weakest intermolecular force because they are caused by temporary fluctuations in electron distribution, leading to temporary dipoles. These forces exist between all molecules, regardless of polarity. Dipole interactions are stronger as they involve permanent dipoles in polar molecules. Hydrogen bonding is even stronger, occurring between a hydrogen atom bonded to a highly electronegative atom and another electronegative atom. Van der Waals forces encompass both dipole interactions and dispersion forces. Thus, dispersion forces are the weakest intermolecular force among the given options.