C371: Concepts In Science (Wgu) Exam Questions (95 Terms) With Verified Definitions Updated 2024

Mixtures {Ans: A combination of two or more substances that are not chemically combined; can be separated by physical changes, such as evaporation.}chemical change {Ans: A change in matter that produces one or more new substances}Carbon-12 {Ans: Most common isotope of Carbon}mass number (atomic mass) {Ans: The sum of protons and neutrons in the nucleus of an atom}Atomic number (z) {Ans: the number of protons in the nucleus of an atom}extensive property {Ans: a property that depends on the amount of matter in a sample}Periodic Table of Elements {Ans: -Arranges all of the known elements from left to right and top to bottom in order of increasing atomic number, and they generally coincide with their increasing atomic mass -Elements with similar properties fall into the same vertical columns to form groups or families -Properties of elements change greatly across any one row (period) -In each element's square, the chemical symbol is in the middle, the atomic weight is usually directly below the symbol, the atomic number is usually shown at the top of the square -As of 2006, the table contains 117 chemical elements whose discoveries have been confirmed -94 are naturally found