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Anonymous users2024-01-24A molecule is made up of atoms and not elements, so it is false;
B From the chemical formula of acetic acid, the mass fraction of hydrogen is 1 412 2 + 1 4 + 16 2
100%, so wrong;
C According to the mass ratio of each element in the compound = the ratio of the relative atomic mass of each element and the number of atoms, the mass ratio of carbon, hydrogen and oxygen in acetic acid can be obtained as 6:1:8; Therefore it is wrong;
D From the molecular structure model of acetic acid, acetic acid is composed of acetic acid molecules, and acetic acid molecules are composed of 2 carbon atoms, 4 hydrogen atoms and 2 oxygen atoms, of which 1 carbon atom has 6 protons and 6 electrons, 1 hydrogen atom has 1 proton and 1 electron, and 1 oxygen atom contains 8 protons and 8 electrons, so each acetic acid molecule contains 32 protons and 32 electrons, so it is correct
So choose D
From the molecular structure diagram of acetic acid, it can be seen that an acetic acid molecule is composed of 2 carbon atoms, 4 hydrogen atoms and 2 oxygen atoms, and its chemical formula is: C2H4O2 >>>More
It should be: an acetic acid molecule is made up of 2 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms.
A, only copper and acid do not react, so the purpose cannot be achieved.
Analysis of test questions B: A. Acetic acid is a compound composed of three elements: carbon, hydrogen and oxygen, which contains carbon and belongs to organic matter, so the choice is wrong >>>More
It can be used as a preservative is table salt, and the chemical formula NaCl belongs to the solution, and it is vinegar, in which the chemical formula of the solute. >>>More