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: Dispersion forces are the weakest intermolecular forces present in non-polar covalent compounds due to temporary dipoles. Non-polar compounds have symmetrical distribution of electrons, leading to temporary shifts in electron density causing dispersion forces. Polar compounds (choice A) have permanent dipoles, ionic compounds (choice C) have strong electrostatic forces, and hydrogen compounds (choice D) involve hydrogen bonding - all of which are stronger than dispersion forces and not typically found in non-polar compounds. Therefore, the correct answer is B - non-polar covalent compounds.

Correct Answer: A

Rationale: The correct answer is A: Decomposition. This reaction involves breaking down a compound into simpler components through the use of heat, light, or electricity. Decomposition reactions are the opposite of synthesis reactions, where compounds are formed from simpler substances. Combustion involves the reaction of a substance with oxygen to produce heat and light. Single replacement reactions occur when one element replaces another in a compound. In this context, only decomposition aligns with the process of breaking down a compound into its component parts.

Correct Answer: C

Rationale: The correct answer is C: Radiation. During radioactivity, particles such as alpha and beta particles, gamma rays, and positrons are emitted. These particles are collectively known as radiation. Electrons (choice A) and protons (choice B) are subatomic particles found in atoms and are not typically emitted during radioactivity. Neutrons (choice D) are neutral subatomic particles and are not emitted during radioactivity. Therefore, the correct answer is C as it encompasses the various types of particles emitted during radioactive decay.

Correct Answer: C

Rationale: The columns of the periodic table are called "Groups" because elements within the same group share similar chemical properties due to having the same number of valence electrons. Each group is designated by a number and a letter, indicating the number of valence electrons. Periods refer to the rows of the periodic table, representing the number of electron shells an element has. Families is a more colloquial term used to describe groups of elements with similar properties. Rows refer to the horizontal rows of the periodic table. Therefore, the correct answer is C as it specifically refers to the vertical columns in the periodic table that share similar chemical properties.