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Anonymous users2024-02-12Too much, what do you want to say!
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Anonymous users2024-02-111. (1) - 0 becomes +2 price. (2) Pure substances are divided into elemental and oxide. Elements include zinc (reactant), mercury. Metal oxides include mercury oxide, and non-metal oxides include water.
2. (1) It contains more N and P elements. (2) 7:55 (3) 12x 3550=, so x is about 106
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Anonymous users2024-02-10(1) From 0 to +2 price.
2) Did you make a mistake and ask unclearly.
2 (1) n and p
2) n:o=14*16:16*110 According to the computer (3), first find the relative molecular mass of the total number c 3550*, and know that each c is 12, so there are 106.
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Anonymous users2024-02-091.Coin cell batteries are commonly used in precision electronics such as watches. Here's what happens in common coin cell batteries:
h2o+zn+hgo=zn（oh）2+hg
1) The valency of Zn in this reaction changes from 0 valence to 2 valence
2) Simply classify the reactants in this reaction, then the substances on the horizontal line below are (fill in the name):
Pure matter (there should be a brace here including the last two items, I can't figure it out) {elemental: zn metal oxide: hgo
Note: The 2 in the chemical formula should be a small 2 in the lower right corner of h
2.Wastewater from a large laundry in Lanzhou is discharged directly into the Yellow River after precipitation, where algae and other plankton bloom in the estuary, and the water is green.
1) The reason for this phenomenon may be that the wastewater discharged from the laundry contains more phosphorus.
2) The data showed that the chemical formula of the algae in the river water was CXHYO110N16P. The mass ratio of nitrogen to oxygen in algae was calculated to be 224:31
3) Knowing that the relative atomic mass of this algae is 3550 and the mass fraction of carbon is , what is the approximate value of x in calculation? 12x 3550=then x=106 (please write out the calculation process).
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Anonymous users2024-02-08It's faster to read the book and see the definitions clearly than to type them out.
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Anonymous users2024-02-071.(1)0 ,+2 (2) The elemental substance is Zn, and the metal oxide is Hgo
2.(1)n、p（2）7：55（3）
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Anonymous users2024-02-061.（1）0 +2
2) Single finger: zn hg
Metal oxides: HGO
I'm sorry, but I can't remember the relative atomic mass of the element in the second question...
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Anonymous users2024-02-05Memorize the chemical formulas, reaction equations, and valencies of common substances, and do not need to memorize relative atomic mass.
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Anonymous users2024-02-04This document is more comprehensive.
The answer may come late, but it should help some others. So, I wish you all the best in the high school entrance examination.
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