Chemistry HESI A2 Quizlet

Questions 70

HESI A2

HESI A2 Test Bank

Chemistry HESI A2 Quizlet Questions

Question 1 of 5

What are the three types of intermolecular forces?

Correct Answer: B

Rationale: The correct answer is B because hydrogen bonding, dipole interactions, and dispersion forces are the three types of intermolecular forces. Hydrogen bonding occurs between molecules with a hydrogen atom bonded to a highly electronegative atom. Dipole interactions arise from the attraction between polar molecules. Dispersion forces are the weakest intermolecular forces and occur due to temporary fluctuations in electron distribution. Choices A, C, and D are incorrect because they do not accurately represent the three specific types of intermolecular forces.

Question 2 of 5

What is the role of a catalyst in a chemical reaction?

Correct Answer: C

Rationale: The correct answer is C: Speeds up the reaction. A catalyst works by providing an alternative pathway for the reaction to occur with lower activation energy, thus increasing the reaction rate without being consumed in the process. This is achieved by stabilizing the transition state of the reaction, making it easier for the reactants to form products. Choice A is incorrect because a catalyst does not slow down the reaction. Choice B is incorrect as catalysts do have a significant effect on reaction rates. Choice D is incorrect because a catalyst does not stop the reaction; it only affects the rate at which the reaction occurs.

Question 3 of 5

Which of the following is the weakest intermolecular force?

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.

Question 4 of 5

What is the product of the decomposition of water?

Correct Answer: A

Rationale: The correct answer is A: Hydrogen and oxygen. Water decomposes into hydrogen and oxygen through a process called electrolysis. In this process, an electric current is passed through water, causing it to break down into its constituent elements. Hydrogen is produced at the cathode, while oxygen is produced at the anode. This is a well-known and scientifically proven reaction. Choices B, C, and D are incorrect because water does not decompose into carbon dioxide, nitrogen, or methane under normal conditions. This can be confirmed by studying the chemical properties and reactions of water.

Question 5 of 5

What type of chemical reaction involves the combination of two elements to form a product?

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.

Similar Questions

Join Our Community Today!

Join Over 10,000+ nursing students using Nurselytic. Access Comprehensive study Guides curriculum for HESI A2-HESI A2 and 3000+ practice questions to help you pass your HESI A2-HESI A2 exam.

Call to Action Image