Cumulative Exam Review (Midterm) Questions with Complete Solutions

Cumulative Exam Review (Midterm) Questions with Complete Solutions What is a key aspect of John Dalton's atomic model? An atom is a tiny particle that cannot be divided further. The ratio of atoms within a compound can change. Atoms of the same element vary in properties. Atoms from different elements are identical. If a gas transforms into a solid, what best describes this transformation? A substance that lacks a specific volume becomes one with a defined volume. A substance with no fixed shape turns into one with a specific shape. A substance that fills its container changes to one with a specific shape but not a fixed volume. A substance with a specific volume becomes one with a much smaller volume. How can a sample of sodium metal be classified? A pure substance and an element. An impure substance that is nonreactive. A mixture that contains various elements. 2 A pure substance and a compound. In a mixture of 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether, which substance acts as the solvent? Methanol Propanol Diethyl ether Water Which statement highlights a chemical characteristic of water? It reacts with sodium metal. It has a freezing point of 0°C. Its density is approximately 1 g/mL. It appears clear and colorless. An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result? The first atom emits light with more