Delgado CHEM 141--Test 1 Chapters 1-2 Questions And Answers With 100% Correct Answers

2.Choose the pure substance from the list below. A) tea B) a casserole C) carbon monoxide D) sugar water E) pomegranate juice - C) carbon monoxide pure substances that cannot be decomposed into simpler substances by chemical reactions - elements building blocks of matter - atoms (and elements) two or more atoms attached in specific geometrical arrangements - molecules science that seeks to understand the behavior of matter by studying the behavior of atoms and molecules - chemistry scientific method steps - 1. observation 2. experiments 3. hypothesis 4. law 5. theory careful noting and recording of natural phenomena - observation procedures designed to test an idea - experimentstentative explanation of a single or small number of observations - hypothesis generally observed occurrence in nature - law general explanation of natural phenomena - theory physical states of matter - solid, liquid, gas composition of matter - pure substances and mixtures made of 1 type of particle; show the same intensive properties - pure substances types of pure substances - elements compounds submicroscopic particles - atoms pure substances that can be decomposed into simpler substances by chemical reactions - compounds chemical combinations of elements - compounds all molecules in a compound are __. - identical--same behavior most natural pure substance - compounds made up of multiple types of particles; may show different intensive properties - mixturesmixtures with uniform composition; mixed uniformly - homogeneous mixture mixtures with un-uniform composition; not mixed uniformly - heterogeneous mixture any property that is measurable; observable - physical property any property that is observed during a reaction in which the chemical composition/identity of the substance is changed - chemical property