미해결 질문A substance made up of two or more elements that have been chemically combined is called1381views
미해결 질문A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n)1799views
미해결 질문A(n) ____________________________________________ is a pure substance made of only one type of atom.2435views
미해결 질문Which of the following could be classified as matter? check all of the boxes that apply.1995views