6Lemons are sour because they contain:AFormic acidBCitric acidCTartaric acid onlyDAcetic acidView AnswerDiscussWorkspaceReportSaveEasy
8The chemical formula of common salt is:ANaClBKClCNaOHDNa₂CO₃View AnswerDiscussWorkspaceReportSaveEasy
10The main component of natural gas is:AEthaneBButaneCPropaneDMethaneView AnswerDiscussWorkspaceReportSaveEasy