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Anonymous users2024-02-07The formula that uses chemical symbols to represent chemical reactions is called a chemical equation.
Chemical equations, like chemical formulas and element symbols, are also common chemical terms. Writing chemical equations is first of all to respect the facts, and secondly, to follow the law of conservation of mass.
When writing a chemical equation, write the reactants on the left side of the equation and the product on the right side of the equation, with an arrow in the middle pointing to the product. Then add the appropriate coefficient before the chemical formula so that the total number of atoms on the left and right sides is equal, in accordance with the law of conservation of mass, which is called balancing of the chemical equation. Of course, some chemical equations do not match self-leveling, just write the conditions of the reaction above or below the arrow, such as ignition, heating or catalyst, and indicate the state of the product.
If there is gas emitted from the product, we put an arrow on the right side of the gas, but there is gas in both the reactant and the product, and there is no arrow on the right side of the gas; If it is usually a chemical reaction carried out in a solution, there is a precipitate in the product, and the arrow on the right side of the precipitate is marked, but there is a solid insoluble in water precipitate in the reactant and the product, and the arrow on the right side of the solid product is not played.
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Anonymous users2024-02-06（1）200+
2）na2co3+h2so4=na2so4+h2o+co2x
So, x=again because 2NaOH +CO2=Na2CO3+H2Oy
So, y=8g
So (50- 8) 50=84%.
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Anonymous users2024-02-05Heating == 2cuo + CO2 + H2O
3h2so4 ==fe2(so4)3 +6h2o5.Zinc reacts with dilute sulfuric acid first: Zn +H2SO4 ==ZnSO4 +H2 When the sulfuric acid is reacted, Zn reacts with FeSo4:
zn+feso4==fe +znso4
Now there is a small amount of zinc, then only the first reaction takes place.
6.Magnesium carbonate in holiday sulfuric acid?
Magnesium carbonate with dilute sulfate MgCO3 + H2SO4 = MgSO4 + H2O + CO2 up arrow.
Two + SO4(2-).
so4 2-
h+ +no3 -
cu 2+ +2no3 -
2hco3-
no3-2al 3+ +3so4 2-
mno4- k+ +clo3-
ca 2+ +2oh -
2no3- 3cl -
14 nh4cl=nh4+ +cl-
The chemical equation for the reaction of brass with dilute hydrochloric acid to form hydrogen gas: Zn + 2HCl = H2 + ZNCL2 >>>More
Several basic laws of chemical reactions, the law of conservation of mass, the law of conservation of atoms, the law of conservation of energy, these three laws are all introduced in your textbooks, and I won't talk nonsense here. >>>More
hcl+agno3=agcl+hno3
nacl+agno3=nano3+agcl2mgcl+2agno3=mg(no3)2+agclh2so4+bacl2=2hcl+baso4h2so4+ba(no3)2=2hno3+baso4na2so4+bacl2=2nacl+baso4k2so4+ba(oh)2=2koh+baso4h2so4+ba(oh)2=baso4+2h2omgso4+ba(oh)2=mg(oh)2+baso4cuso4+ba(oh)2=cu(oh)2+baso4na2co3+2hcl=na2co3+h2o+co2na2co3+h2so4=na2so4+h2o+co2k2co3+2hno3=2kno3+h2o+co2caco3+2hcl=cacl2+h2o+co2caco3+2hno3=ca(no3)2+h2o+co2mgco3+2hcl=mgcl2+h2o+co2co2+2naoh=na2co3+h2o >>>More
I'll tell you the truth, it's not very useful for you to make so many equations, it's not very useful, it's not like you usually accumulate with a strong interest, and chemical equations don't have to be memorized one by one, since it's a science subject, you have to grasp the principles and Wubi's laws, rote memorization is not something we should do, and the equations of the one upstairs are all the foundation of the foundation, and it's a complete waste of time to memorize them all, but then again, if you think about a few representative reactions yourself, you might end up with one as ten.
Hey, I don't even want to write about it, didn't you learn all this in the academy?