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F.3 Chemistry(超急~~)
發問:
1.which of the following substances are elements?(1)graphite(2)dry ice(3)gold A.(1)and(2) onlyB(1)and (3) onlyC(2) and(3) onlyD(1),(2) and (3)************************************************************2.silver is an element because it A.is formed when silver nitrate heatedB. combines with oxygen to form a... 顯示更多 1.which of the following substances are elements? (1)graphite(2)dry ice(3)gold A.(1)and(2) only B(1)and (3) only C(2) and(3) only D(1),(2) and (3) ************************************************************ 2.silver is an element because it A.is formed when silver nitrate heated B. combines with oxygen to form a compound C.occurs naturally D.cannot be decomposed chemically ************************************************************ 3.which of the following about compounds is correct? A.compounds must be impure B.air is an example of compound C.a compound must be composed of at least two elements D.when an element is broken down chemically , compounds are formed *********************************************************** 4.which of the following about carbon dioxide is/are correct? A.it is a mixture of carbon and oxygen B.it is an odourless gas C.it can be broken down into simpler substances. A.(1)only B(2)only C.(1) and (3) only D.(2) and (3) only 更新: ★in the diagrams below , circles of different sizes represent particles of different elements . which diagram can represent water? A.. O O O B. O O O O C. OoO oOo D. OOOOOOOOO OOOOOOOO OOOOOOOOO
1) b because graphite is made up of carbon carbon & gold can be found in the periodic table 2) d silver can be found in the periodic table therefore it cannot be decomposed 3) c the composition of two or more elements is called compound 4) c carbon dioxide is made up of 1carbon and 2 oxygen. carbon dioxide has smell. carbon dioxide is a compound, therefore, it can be broken down.
其他解答:
F.3 Chemistry(超急~~)
發問:
1.which of the following substances are elements?(1)graphite(2)dry ice(3)gold A.(1)and(2) onlyB(1)and (3) onlyC(2) and(3) onlyD(1),(2) and (3)************************************************************2.silver is an element because it A.is formed when silver nitrate heatedB. combines with oxygen to form a... 顯示更多 1.which of the following substances are elements? (1)graphite(2)dry ice(3)gold A.(1)and(2) only B(1)and (3) only C(2) and(3) only D(1),(2) and (3) ************************************************************ 2.silver is an element because it A.is formed when silver nitrate heated B. combines with oxygen to form a compound C.occurs naturally D.cannot be decomposed chemically ************************************************************ 3.which of the following about compounds is correct? A.compounds must be impure B.air is an example of compound C.a compound must be composed of at least two elements D.when an element is broken down chemically , compounds are formed *********************************************************** 4.which of the following about carbon dioxide is/are correct? A.it is a mixture of carbon and oxygen B.it is an odourless gas C.it can be broken down into simpler substances. A.(1)only B(2)only C.(1) and (3) only D.(2) and (3) only 更新: ★in the diagrams below , circles of different sizes represent particles of different elements . which diagram can represent water? A.. O O O B. O O O O C. OoO oOo D. OOOOOOOOO OOOOOOOO OOOOOOOOO
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最佳解答:1) b because graphite is made up of carbon carbon & gold can be found in the periodic table 2) d silver can be found in the periodic table therefore it cannot be decomposed 3) c the composition of two or more elements is called compound 4) c carbon dioxide is made up of 1carbon and 2 oxygen. carbon dioxide has smell. carbon dioxide is a compound, therefore, it can be broken down.
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