UNE CHEM 1011 Exam 1 Questions With Complete Solutions

pure substance correct answer: A sample of matter, either a single element or a single compound, that has definite chemical and physical properties Examples of pure substances correct answer: elements, compounds, water, table salt (sodium chloride), ethanol, gold, bronze, etc. Mixture correct answer: A combination of two or more substances that are not chemically combined homogeneous mixture correct answer: A mixture in which substances are evenly distributed throughout the mixture heterogeneous mixture correct answer: A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture physical change examples correct answer: changes in shape/form chemical change examples correct answer: change in the composition of the reactants alkali metals correct answer: Group 1: left-most column alkaline earth metals correct answer: Group 2: row next to the alkali metals (group 1) Halogens correct answer: Group 7A or 17: starts with F and goes down the column noble gases correct answer: Group 18 or 8A: right-most column diatomic molecules correct answer: BrINClHOF: Br2, I2, N2, Cl2, H2, O2, F2