Chemistry HESI A2 Quizlet

Correct Answer: C

Rationale: The correct answer is C: Covalent bonds are the strongest type of chemical bond. In covalent bonds, atoms share electrons, creating a strong bond between them. This sharing of electrons results in a stable molecular structure. Ionic bonds (choice A) are strong but not as strong as covalent bonds because they involve the transfer of electrons, leading to weaker attractions. Hydrogen bonds (choice B) are weaker than covalent bonds as they are formed between hydrogen atoms and highly electronegative atoms like oxygen or nitrogen. Metallic bonds (choice D) are not as strong as covalent bonds because they involve the sharing of electrons among a sea of delocalized electrons in metals, leading to a weaker bond compared to covalent bonds.

Correct Answer: C

Rationale: Alpha particles are positively charged and relatively large, so they have low penetrating power. A piece of paper can stop alpha particles because the paper's thickness provides enough material for the particles to collide with and lose their energy through ionization. Aluminum foil and glass are not thick enough to effectively stop alpha particles. Plastic, depending on its thickness, may not provide sufficient shielding to stop alpha particles completely. In summary, the correct answer is C because the thickness of a piece of paper is sufficient to stop alpha particles, while the other choices are not adequate for effective shielding.

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: C

Rationale: The correct answer is C: Covalent bonds are the strongest type of chemical bond. In covalent bonds, atoms share electrons, creating a strong bond between them. This sharing of electrons results in a stable molecular structure. Ionic bonds (choice A) are strong but not as strong as covalent bonds because they involve the transfer of electrons, leading to weaker attractions. Hydrogen bonds (choice B) are weaker than covalent bonds as they are formed between hydrogen atoms and highly electronegative atoms like oxygen or nitrogen. Metallic bonds (choice D) are not as strong as covalent bonds because they involve the sharing of electrons among a sea of delocalized electrons in metals, leading to a weaker bond compared to covalent bonds.

Correct Answer: A

Rationale: The correct answer is A because a balanced chemical equation must satisfy the law of conservation of mass. This means that the number of atoms of each element must be the same on both the reactant and product sides. This ensures that no atoms are gained or lost during a chemical reaction. Explanation for why the other choices are incorrect: B: An equation with more products than reactants does not follow the law of conservation of mass. C: Balancing the number of molecules is important, but the key factor is balancing the number of atoms of each element. D: Equal masses on both sides do not necessarily guarantee that the number of atoms of each element is the same.