Chemistry HESI A2 Quizlet

Correct Answer: A

Rationale: Certainly! The correct answer is A: Radioactivity. Radioactivity refers to the emission of particles from an unstable nucleus due to nuclear instability. This process can include alpha, beta, or gamma decay. Choice B, Radiation, is a more general term that encompasses various types of energy emission, not specific to nuclear decay. Choice C, Decay, is a broader term and does not specify the emission from a nucleus. Choice D, Fusion, involves combining nuclei to form a heavier nucleus, not the emission of particles from an unstable nucleus.

Correct Answer: B

Rationale: The correct answer is B: Gas. Gases change in volume with changes in temperature and pressure according to the ideal gas law (PV = nRT). When temperature or pressure increases, gas molecules move faster and occupy more space, leading to an increase in volume. Liquids (choice A) have relatively fixed volumes, solids (choice C) have definite shapes and volumes, and plasmas (choice D) are ionized gases with unique properties but still do not change volume based on temperature and pressure changes.

Correct Answer: C

Rationale: The correct answer is C: Combustion. Combustion is a chemical reaction where a compound reacts with oxygen to produce heat, light, and often carbon dioxide and water. In this type of reaction, oxygen is a reactant and typically a hydrocarbon or organic compound is the fuel. Decomposition involves a compound breaking down into simpler substances, synthesis is when two or more substances combine to form a more complex compound, and single replacement is when one element replaces another in a compound. Combustion specifically involves the reaction with oxygen, 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.

Correct Answer: C

Rationale: The correct answer is C: Gamma. Gamma radiation is high-energy electromagnetic radiation with no charge or mass, making it able to penetrate matter easily. Beta (A) and Alpha (B) radiation are particles with charge and mass, and Delta (D) is not a type of radiation. Therefore, Gamma is the only option that fits the given characteristics.