Chemistry

Notes

Chemistry Study Guide – Unit 1 Review 1. 1. Characterize the shape and volume (definite vs. indefinite) of solids, liquids, and gases. Solids: Definite shape, definite volume Liquids: Indefinite shape, definite volume Gases: Indefinite shape, indefinite volume 2. 2. Convert each of these temperatures: a. –89 °C → 184 K b. 425 °C → 698 K c. 29 K → –244 °C d. 628 K → 355 °C 3. 3. Differentiate between accuracy and precision. Accuracy: Closeness of a measurement to the true value Precision: Closeness of repeated measurements to each other 4. 4. Differentiate between elements, mixtures, and compounds. Elements: Pure substance, one type of atom Compounds: Two or more elements chemically bonded in fixed ratios Mixtures: Physical combination of substances, not chemically bonded 5. 5. Differentiate between homogeneous and heterogeneous mixtures. Homogeneous mixture: Uniform composition throughout Heterogeneous mixture: Non-uniform composition; different parts are visible 6. 6. Differentiate between physical and chemical changes. Identify each: a. Melting → Physical b. Rusting → Chemical c. Reacting → Chemical d. Cutting → Physical e. Bending → Physical f...