Chemistry Terms: Compounds, Properties, Changes, Atoms, Ions, Bonds, Quizzes of Chemistry

Download Chemistry Terms: Compounds, Properties, Changes, Atoms, Ions, Bonds and more Quizzes Chemistry in PDF only on Docsity! TERM 1 Compound DEFINITION 1 A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. TERM 2 homogeneous DEFINITION 2 perfectly mixed substance, saltwater TERM 3 heterogeneous DEFINITION 3 different phases are evident, mud TERM 4 Molecule DEFINITION 4 A molecule is an electrically neutral group of two or more atoms held together by covalent chemical bonds. TERM 5 extensive property DEFINITION 5 depends on the amount of substance present TERM 6 intensive property DEFINITION 6 In the physical sciences, an intensive property, is a physical property of a system that does not depend on the system size or the amount of material in the system: it is scale invariant. TERM 7 physical change DEFINITION 7 Physical changes are changes affecting the form of a chemical substance, but do not change the chemical composition of that substance. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds. TERM 8 chemical change DEFINITION 8 Chemical changes occur when a substance combines with another to form a new substance, called synthesis or, alternatively, decomposes into two or more different substances. TERM 9 Atomic number DEFINITION 9 In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. TERM 10 mass number DEFINITION 10 The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.