Chemistry 111 Exam 1 Study Guide Density Mass Volume Pure Substances Elements Compounds Mixtures Homogeneous Heterogeneous Matter States Solid Liquid Gas Physical Chemical Changes Measurement Units Accuracy Precision Uncertainty Significant Figures Scient

Chemistry 111 Exam 1 Study Guide Density Mass Volume Pure Substances Elements Compounds Mixtures Homogeneous Heterogeneous Matter States Solid Liquid Gas Physical Chemical Changes Measurement Units Accuracy Precision Uncertainty Significant Figures Scientific Principles Practice Exam Questions Verified and Provided with Complete A+ Graded Answers Latest Updated 2026 Density Anything that has mass or takes up space Density = Mass / Volume (g/mL, etc.) How many types of density? Two - Pure Substances & Mixtures Pure Substances One type of matter present, fixed composition Example of Pure Substance H2O, H2O2 How many types of pure substances? Two - Elements & Compounds Elements Simplest form of matter, made of only one type of matter Compound Made of 2+ elements, always combined in the same proportions Examples of Compounds H2O, H2O2, C12H22O11 Mixture Combinations of 2+ different substances that can be separated into different components How many types of mixtures? Two - Homogeneous and Heterogeneous Homogenous Mixture Same composition throughout Heterogeneous Mixture Different composition throughout Three States of Matter Liquid, Solid, & Gas Solid Fixed shape and volume Very tightly packed particles Strong attraction Liquid Fixed volume No fixed shape (takes the shape of whatever container it is in) Tightly packed particles Strong attraction Gas No fixed volume or shape Fills volume of whatever container it is in Minimal attraction between particles Physical Changes A process that changes a substance's physical appearance, but not its chemical composition Chemical Changes A process that results in a change in a substance's chemical composition Measurement Determination of the dimensions of an object Units of Measurement Giga .00001 Mega .0001 Kilo .001 Hecto .01 Deca .1 UNITS 1 Deci 10