미해결 질문A substance made up of two or more elements that have been chemically combined is called1442views
미해결 질문A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n)1989views
미해결 질문A(n) ____________________________________________ is a pure substance made of only one type of atom.2572views
미해결 질문Which of the following could be classified as matter? check all of the boxes that apply.2090views