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 (2). In a double covalent bond, two electron pairs are shared between two atoms. This is achieved by the sharing of two pairs of electrons, resulting in a total of four electrons being shared. However, since each pair consists of two electrons, the number of electron pairs shared to form a double covalent bond is 2. Choices A, C, and D are incorrect because a double bond involves the sharing of 2 electron pairs, not 1, 3, or 4 pairs.

Correct Answer: A

Rationale: The correct answer is A: Chemical. In chemical reactions, atoms interact to achieve stable electron configurations through sharing, gaining, or losing electrons. This process involves forming chemical bonds to reach a more stable state, following the octet rule. Nuclear reactions involve changes in the nucleus, not electron configurations. Physical reactions involve changes in state or phase, not electron configurations. Mechanical reactions involve forces and motions, not electron configurations. Therefore, the correct choice is A as it directly pertains to atoms achieving stable electron configurations through chemical interactions.

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: C

Rationale: The correct answer is C: Synthesis. In a synthesis reaction, two or more substances combine to form a single compound. When two elements combine to form a product, it is a classic example of a synthesis reaction. During synthesis, the reactants lose their individual properties and form a new compound. A) Decomposition involves a single compound breaking down into two or more simpler substances. B) Combustion is a chemical process involving a fuel and an oxidant, resulting in the release of energy. D) Double replacement involves the exchange of ions between two compounds to form two new compounds. Therefore, the correct answer is C because it best describes the scenario of two elements combining to form a product.