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O2 means () ① Oxygen ② Oxygen element ③ An oxygen molecule ④ Oxygen consists of oxygen element ⑤ An oxygen molecule consists of two oxygen atoms.
Macroscopically, O2 can represent oxygen, which is composed of oxygen elements. Microscopically, it can represent an oxygen molecule consisting of two oxygen atoms. Can't represent oxygen, whose symbol is O; Elements only talk about types, not quantity, so they can't represent two oxygen elements. So the meaning of 134⑤ is correct. So I chose D.
1 Browsing 52016-11-25
There are several opinions about the meaning of O2: ① stands for oxygen, ② stands for oxygen element, ③ stands for two oxygen atoms, ④ stands for/kloc-0 per oxygen molecule, and ⑤.
"O2" refers to oxygen macroscopically; It means that oxygen is composed of oxygen elements; Microscopically, it represents 1 oxygen molecule; It means that 1 oxygen molecule consists of 2 oxygen atoms; Oxygen can be expressed as o; According to the number of atoms represented by the number marked before the element symbol, two oxygen atoms can be expressed as: 2O; According to the chemical formula of oxygen, it can't be said that oxygen is a colorless gas, so the meaning expressed by ① ④ ⑤ is correct, so D is chosen.
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The following statement about O2 is correct: () ① means oxygen element ② means one oxygen molecule ③ means two oxygen atoms ④ means that oxygen is composed of oxygen element.
According to the chemical formula of O2, O2 can represent 1 oxygen molecule, oxygen is composed of oxygen elements, and an oxygen molecule is composed of two oxygen atoms. Oxygen can be expressed as o; Two oxygen atoms can be represented as 2O; Two oxygen molecules can be expressed as: 2O. So 246 is correct. So I chose C.
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There are several opinions about the meaning of O2: ① stands for oxygen, ② stands for oxygen element, ③ stands for two oxygen atoms, ④ stands for/kloc-0 per oxygen molecule, and ⑤ stands for.
According to the chemical formula of O2, O2 can represent ① oxygen, ④ 1 oxygen molecule, and ⑤ 1 oxygen molecule contains two oxygen atoms. ② Oxygen element can be expressed as: O; ③ Two oxygen atoms can be expressed as: 2O; From the chemical formula of oxygen, it can't be concluded that oxygen is a colorless gas, so the statement of 14⑤ is correct, so choose A.
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"O2" refers to oxygen, and can also refer to () ① oxygen element; (2) an oxygen molecule; ③ Each oxygen molecule consists of two oxygen atoms; What is oxygen made of?
"O2" refers to oxygen macroscopically; It means that oxygen is composed of oxygen elements; Microscopically, it represents 1 oxygen molecule; It means that 1 oxygen molecule consists of 2 oxygen atoms; (1) oxygen can be expressed as o; Oxygen is composed of oxygen molecules, and 1 oxygen molecules are composed of two oxygen atoms, so ⑤ statement is wrong. So the meaning expressed by 234⑤ is correct.
2 browse1152016-12-02
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