HESI A2 Version 1 Chemistry

Correct Answer: A

Rationale: In catabolic pathways, complex molecules are broken down into simpler ones, leading to an increase in disorder or entropy. Entropy represents the measure of randomness or disorder in a system. As chemical reactions break down molecules, the overall disorder in the system tends to increase, making entropy the correct answer in this context. Therefore, the correct answer is 'Entropy' as it aligns with the concept of increased disorder in catabolic pathways. Enthalpy, on the other hand, relates to the total heat content of a system and is not specifically associated with disorder or complexity. Glucose and glycogen are molecules involved in energy storage and are not directly related to the increase in disorder observed in catabolic pathways.

Correct Answer: B

Rationale: Chemical equations are typically written with reactants listed on the left side of the arrow and products on the right side. This convention signifies the progression of reactants transforming into products during a chemical reaction. Therefore, the correct way chemical equations are typically written is 'Reactants ā†’ Products.'

Correct Answer: C

Rationale: A redox reaction, short for reduction-oxidation reaction, involves the transfer of electrons from one reactant to another. In these reactions, one substance is oxidized (loses electrons) while another is reduced (gains electrons). The term 'redox' comes from the simultaneous occurrence of reduction and oxidation reactions. Combustion reaction (choice A) involves a substance reacting with oxygen to produce heat and light, but it does not necessarily involve electron transfer. Synthesis reaction (choice B) involves the combination of two or more substances to form a new compound, with no mention of electron transfer. Double-displacement reaction (choice D) involves an exchange of ions between two compounds but does not specifically involve electron transfer between atoms. Therefore, option C, redox reaction, is the correct answer as it accurately describes the electron transfer process that occurs during such reactions.

Correct Answer: A

Rationale: The correct name for aqueous HI is hydroiodic acid. In the naming of binary acids, the prefix 'hydro-' is combined with the root of the nonmetal element and the suffix '-ic acid'. Therefore, the correct systematic name for HI in aqueous solution is hydroiodic acid.