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Anonymous users2024-02-101: Hydroxide is 10 electrons 2: no, 3: o2
It is a peroxide ion. The two oxygens each donate an electron, common, to form a covalent bond. na+［:0:0:2-na+
4: No, 5: Aluminum, I'll do that. Sorry, can't help much.!
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Anonymous users2024-02-09Yes, with a negative charge.
3br2+2fe
febr3na-o-o-na
No, the oxygen two-bond angle is not 180°, ho-ba-oh is.
It seems that the acidity of the strong binding force with H is weak, and the acidity of the strong oxygenated acid hydride is weak, so the acidity on the right side of the diagonal is less than that on the left during the same period, and the acidity below the same side of the diagonal is weak.
Yes, many organic acids are carbonated acidity, strong acid and weak acid CO2 and sodium silicate can reflect the formation of sodium carbonate.
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Anonymous users2024-02-081. Yes. br2
2fe2febr3
3. The structural formula of Na2O2 and Ba(OH)2 cannot be written here, Na2O2 contains a non-polar covalent bond (between two oxygen atoms), and Ba(OH)2 contains a non-polar covalent bond (between oxygen atom and hydrogen atom).
4. P and Br are stronger, and the stronger the reduction, the stronger the aqueous solution of its acidic gaseous hydride.
5. Yes, Na2SiO3+CO2+H2O==Na2CO3+H2SiO3
Acidic H2SiO3 can be indicated< H2CO3, but many organic acids are weaker acidic than silicic acids.
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Anonymous users2024-02-071.(2) There is a mist of water {small droplets} on the wall of the beaker, and (3) the solution becomes turbid.
Use a burning stick of wood (a stick with sparks is not enough) to stretch into two bottles, extinguishing carbon dioxide, not extinguishing air (2) to pass the gas into the clarified lime water, carbon dioxide gas will make the solution obviously turbid, but no.
4.Fill it with water, then weigh the volume of water, and the result is the volume of the gas collection cylinder.
5.(1) First, fill the gas collection bottle with water, and then pour the water at the designated place and the specified time, and then the air sample in the greenhouse (2) the pump, the balloon (3) at noon, because of photosynthesis, the carbon dioxide released by respiration is converted into oxygen by photosynthesis, so the oxygen content is higher. In the early hours of the morning, there is only respiration, so the carbon dioxide content is higher.
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Anonymous users2024-02-061. (2) There is a water mist on the wall of the beaker (3) The clarified lime water becomes turbid.
2. A3, use a wooden strip with sparks to stretch into two bottles respectively, extinguishing carbon dioxide, and not extinguishing air.
4. Fill it with water, then weigh the volume of water, or weigh the mass and calculate its volume according to the density of water. The result is the volume of the cylinder.
5. (1) This is speechless, if you collect gas, you can open the jar directly. . . If you have to be so advanced, you can use the inverted gas collection method, and a device to collect oxygen and carbon dioxide, but you need to add a pump.
2) Pumps, balloons.
3) Because of photosynthesis at noon, the carbon dioxide released by respiration is converted into oxygen by photosynthesis, so the oxygen content is high. In the early hours of the morning, there is only respiration, so the carbon dioxide content is higher.
I've been doing this for a long time, hope.
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Anonymous users2024-02-05There is a mist of water and the clarified limestone becomes cloudy.
aWhen a burning wooden stick is put in, the carbon dioxide is extinguished.
Clarified limestone After pouring it in, the carbon dioxide becomes turbid.
Fill it with water, pour it into a graduated cylinder, read it aloud.
5.(1) Fill the gas collection bottle with water and pour it out after entering the greenhouse.
2) Syringe Suck a syringe.
3) Whatever you say, guess.
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Anonymous users2024-02-041. Colorless droplets appear on the glass wall, and the clarified lime water becomes turbid.
2 a3 with clarified lime water with a lit candle.
4 Fill with water - > water weight - > water volume.
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Anonymous users2024-02-031.100 5 = 20 20 * 1 = 20 so it's 20 grams.
8*5=40 so it's 40 grams.
2.False: The solubility of calcium hydroxide solution increases with decreasing temperature.
False: Crystalline hydrates can write chemical formulas, which are pure in a sense (I have looked up a lot of sources and say yes).
False: A solute is a part of the solvent that is dissolved, and the way in which the solution is disposed of is uncertain, so it is wrong, such as the evaporation solvent method.
Hehe, hopefully.
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Anonymous users2024-02-02When the temperature increases, the solubility decreases, as if KCL is;
It is pure; For example, the mass fraction of the saturated solution remains unchanged.
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Anonymous users2024-02-011. The solubility is 20 grams.
Evaporate 40 grams of water.
2. (1) Missaturated calcium hydroxide solution.
2) Wrong is a compound in a pure substance, and bile alum is a substance, which is precipitated from a saturated solution.
3) Error unchanged, the saturated solution is still saturated after the crystal is precipitated, and the quality remains unchanged.
It should be right.
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1.Acetic acid is an organic substance.
2.Generally speaking, metals are easy to lose electrons, and non-metals are easy to get electrons, when metals and nonmetals form compounds, metals will lose outer electrons to non-metals, so that metals form cations, and nonmetals form anions, NaCl is Na loses an outer electron to Cl, so Na+ and Cl- are formed, and then Na+ and Cl- form NaCl through electrostatic action, So NaCl is made up of ions; When HCL is formed, H wants to get an electron to reach a stable structure with two electrons in the outer shell, and Cl also wants to get a stable structure with an electron to reach the outer layer of 8 electrons, both want to get electrons, and can only form compounds HCL by sharing electron pairs, so HCL does not form anions and cations when it is formed, but compounds formed by sharing electron pairs, so HCL is composed of molecules, and the same H2SO4 is also a compound formed by non-metals and non-metals, which is composed of molecules. In general, the compounds formed by metals and non-metals are composed of ions, while the compounds formed by non-metals and non-metals are composed of molecules, for example, MgCl2 is composed of ions, and HnO3 is composed of molecules. >>>More
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