HESI A2
HESI A2 Chemistry Questions Questions
Question 1 of 5
What is another name for aqueous HI?
Correct Answer: D
Rationale: The correct answer is D: hydriodic acid. In aqueous solution, HI dissociates into H+ and I- ions, forming hydriodic acid. Choice A (hydroiodic acid) is incorrect as it does not reflect the presence of water in the compound. Choice B (hydrogen monoiodide) is incorrect as it incorrectly implies the presence of only one iodide ion. Choice C (hydrogen iodide) is incorrect as it does not specify the compound in aqueous solution. Therefore, the correct term for aqueous HI is hydriodic acid.
Question 2 of 5
Which substance is a product of photosynthesis?
Correct Answer: D
Rationale: The correct answer is D: Glucose. Glucose is a product of photosynthesis, as plants use sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen. Glucose is a type of carbohydrate that serves as a primary source of energy for plants and other organisms. Carbon dioxide (A) is one of the reactants needed for photosynthesis, not a product. Oxygen (B) is released as a byproduct of photosynthesis, not a product. Water (C) is also a reactant in photosynthesis, not a product. Therefore, the correct answer is D because glucose is the main product of photosynthesis.
Question 3 of 5
Which state of matter has a definite volume but takes the shape of its container?
Correct Answer: B
Rationale: The correct answer is B: Liquid. Liquids have a definite volume, meaning they have a fixed amount of space they occupy, but they take the shape of their container because their particles are not arranged in a fixed pattern like solids. In contrast, gases (choice A) have neither a definite volume nor a definite shape, as their particles are free to move and fill the entire space of their container. Solids (choice C) have both a definite volume and shape due to their tightly packed and ordered particles. Plasma (choice D) is a state of matter where particles are highly energized and ionized, lacking a definite shape or volume.
Question 4 of 5
Which element is a metalloid?
Correct Answer: A
Rationale: Silicon is a metalloid because it exhibits properties of both metals and non-metals. It is a semiconductor, has a shiny appearance, and conducts electricity to some extent. Lead is a metal, helium is a noble gas, and aluminum is a metal. Therefore, the correct answer is A: Silicon.
Question 5 of 5
What is the name of the process by which a gas turns into a liquid?
Correct Answer: B
Rationale: The correct answer is B: Condensation. Condensation is the process in which a gas turns into a liquid by losing heat energy. During condensation, gas molecules slow down and come closer together, forming liquid droplets. Sublimation (A) is the process of a solid turning directly into a gas without passing through the liquid phase. Evaporation (C) is the process of a liquid turning into a gas. Deposition (D) is the process in which a gas transforms directly into a solid without becoming a liquid first.
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