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Anonymous users2024-02-07(1) False. The carbon dioxide molecule is made up of two oxygen atoms and one carbon atom.
The answer is that the carbon dioxide molecule is made up of two oxygen atoms and one carbon atom. The number of atoms should be said to be "composition".
2) False. Carbon dioxide is made up of two elements, carbon and oxygen. The question here is what is carbon dioxide? So so: carbon dioxide is made up of the elements carbon and oxygen. The type of element is to say "composition".
It used to be taught in our chemistry textbooks. You'd better ask your chemistry teacher what he should be saying to understand better.
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Anonymous users2024-02-06The first mistake is to say that atoms are made up, but to say the number.
The second mistake, the same goes for it.
It should be said that a CO2 molecule is made up of two O atoms and one C atom.
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Anonymous users2024-02-05(1) The carbon dioxide molecule is composed of two atoms, carbon and oxygen. (√
2) Carbon dioxide is made up of carbon atoms and oxygen atoms. (x) Carbon dioxide is made up of carbon atoms and two oxygen atoms.
The above is wrong, (1) is about the type, and there is no need to say the number.
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Anonymous users2024-02-04(1) The carbon dioxide molecule is composed of one carbon atom and two oxygen atoms.
2) Carbon dioxide is composed of two elements: carbon and oxygen.
Atoms talk about the number (composition), and elements talk about the type (composition).
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Anonymous users2024-02-03The first sentence is wrong, (because with the development of society, the number of pollutants increases, and the composition of the air also changes!) The second sentence is right, (air is essential for us humans).
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Anonymous users2024-02-021。First consider the color and smell (e.g. copper sulphate solution is blue, ammonia has a pungent odor)2. Then the solution resolved in 1 is added to other solutions to see if precipitate or bubbles are generated, so as to judge the composition of other solutions.
3。Repeat in 2 and continuously add the identified solution to the unidentified solution until all parts are identified.
The main thing is to remember the equations of the reactions of different solutions and the characteristics of the products, and then analyze them according to the actual situation. More practice will improve your proficiency.
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Anonymous users2024-02-01Those who can see the color look at the color, and then exchange each other, different phenomena are different substances.
A is not true. First of all, the temperature has an effect on the solubility, such as the 30 degrees of potassium nitrate saturated solution to 40 degrees, it is no longer a saturated solution, and then add a little potassium nitrate, less than the saturated state, but its concentration is already larger than the concentration of the saturated solution at 30 degrees, in addition, the solubility of some substances is reduced with the rise of temperature. Such as some gases. >>>More
It's simple, it's about interest, like I dare to sleep, chat and play with my phone in chemistry class in my third year of junior high school, but chemistry is still okay, it's just about interest. >>>More
First, the substance is dissolved in water or a solvent of any kind. >>>More
CaCO3, BaCO3, Baso4, Baso3, Fe(OH)2 (unstable), Agoh (unstable), Mg(OH)2, Al(OH)3, Zn(OH)2, H4SiO4 (H2SiO3), Zns, NaHCO3 (precipitate produced by CO2 in saturated Na2CO3), CaSO4 (slightly soluble). >>>More
The relative atomic mass of element M is a, the formula of compound RM2 is b, and the relative atomic weight of r is (b—2a). >>>More