What is the difference between a gas and a liquid? Is butane a greenhouse gas? What is the mass number of copper? What is the mass number for krypton? What is the molecular weight of Fe(NO3)3? What is the molar mass of a compound?
What is the molecular mass of methanol? What is the molar mass of Na3AlF6? What is the molecular weight of Fe(NO3)3? What is the mass number of hydrogen? What is the formula mass of a molecule of C6H12O6? What is the atomic mass of hydrogen?
书写下列化学方程式：1、高温下一氧化碳还原四氧化三铁___；2、把铁放入硫酸铜溶液中得到铜和硫酸亚铁___；3、把少量的水泼到燃烧旺的焦炭上，生成了一氧化碳和氢气___；4、氢气在高温条件下和氧化铁反应生成铁和水___．
小明希望用稀硫酸和锌粒反应来制取氢气，但实验室提供的是溶质质量分数为98%的浓硫酸．试计算：（1）将10g浓硫酸配制成溶质质量分数为19.6%的稀硫酸，需要加水多少克？___（2）取上述配制好的溶质质量分数为19.6%的稀硫酸20g与足量锌粒充分反应，能制得氢气质量为多少克？___（3）充分反应后所得溶液中溶质...
What is the molar mass of sodium hydroxide? What type of reaction occurs during an acid-base titration? Silver nitrate and aluminum chloride react with each other by exchanging anions. 3AgNO3(aq) + AlCl3(aq) arrow Al(NO3)3(aq) + 3AgCl(s) What mass of precipitate is produced when 4.22...
What is fluorine's molar mass? What is the molecular weight of water? What is the molar mass of Zn(NO3)2? What is the molar mass of a compound? What is the molecular weight of Fe(NO3)3? What is the molar mass of Na3AlF6? What is the atomic mass of water? What is the molecul...
In the equatorial upwelling area, Fe is supplied from source water along with NO3, Si(OH)4, and PO4 (=-=Johnson et al., 1997-=-). Unfortunately, little is known of the distribution of Fe, its form and regeneration, or its effect on primary nutrient uptake kinetics, making it ...
2.How is a covalent bond formed? Covalent bonds are formed when electrons are shared to complete an octet. 3.Write the Lewis structure for NH3 4.Whattype of elementsreceivevalence electrons to achieve a configuration of a noble gas? Non-metals that form anions Elements with high electronegativi...
1)Ca+2HCl--->CaCl2+H2 2)Ca+2HNO3--->Ca(NO3)2+H2 3)Ca+H2SO4--->CaSO4+H2 4)Ca+2H3PO4--->Ca3(PO4)2+3H2 5)Zn+2HCl--->ZnCl2+H2 6)Zn+2HNO3--->Zn(NO3)2+H2 7)Zn+H2SO4--->ZnSO4+H2 8)Zn+2H3PO4--->Zn3(PO4)2+3H2 9)Fe+2HCl--->FeCl2+H2 10)...
A.常温下,将铁片置于浓硝酸中:Fe+6HNO3=Fe(NO3)3+3NO2↑+3H2OB.向氯化铵的稀溶液中加入少量NaOH:NH4++OH-=NH3↑+H2OC.向(NH4)2SO4溶液中加入适量Ba(OH)2:Ba2++SO42-=BaSO4↓D.向浓硝酸中加入铜片:Cu+4H++2NO3-= [单选]患儿,出生3周,喂奶后立即或不久即吐,呈喷射状,吐物为奶及奶块。根据...