When aluminum reacted with the acid, a silver-white solid would be produced. Because the metal activity of the acid was after that of aluminum, aluminum would replace the acid from the salt solution. Read more exciting novels for free
First, the reaction between the water and the salt would be observed. The salt would float on the surface of the water and melt into a silver-white ball. It would swim around on the surface of the water, accompanied by a sizzling sound. The reaction would produce hydrogen gas and then the reaction between the aluminum and the solution of the salt and water would produce hydrogen gas. The total reaction was the reaction of aluminum and water to produce meta-aluminum aluminum and hydrogen. There was a phenomenon of hydrogen formation during the reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Alum was a water-containing molecular aluminum potassium sulphate. It had limited dissolution in cold water, but in warm water, due to dehydration, aluminum would be separated and form aluminum trioxides. Aluminium-tritium had a strong absorption effect (because it was charged). It would absorb impurities such as iron ions in the water to form a larger molecular group, which would make the water turn yellow first. As the molecular group became larger and larger, it would sink to the bottom and the water would become transparent. In addition, the dissolving of the aluminum in water will lower the temperature and reduce the total volume (because there are gaps between the molecules). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
1. **金属与酸的反应** - **反应方程式及现象(以常见金属镁、铁、锌、铝与稀硫酸反应为例)** - 镁与稀硫酸反应:\(Mg + H_{2}SO_{4}=MgSO_{4}+H_{2}\uparrow\),现象为反应剧烈,有大量气泡产生。 - 铁与稀硫酸反应:\(Fe + H_{2}SO_{4}=FeSO_{4}+H_{2}\uparrow\),现象是有气泡产生,溶液由无色变为浅绿色(因为生成了亚铁离子)。 - 锌与稀硫酸反应:\(Zn + H_{2}SO_{4}=ZnSO_{4}+H_{2}\uparrow\),反应较剧烈,产生气泡。 - 铝与稀硫酸反应:\(2Al+3H_{2}SO_{4}=Al_{2}(SO_{4})_{3}+3H_{2}\uparrow\),产生气泡。 - **反应规律及图像问题(针对初中化学常见考点)** - 当等量的金属分别和足量的酸反应(酸过量)时,反应中最终产生氢气的多少由金属决定。在金属化合价相同的情况下,对于相同质量的金属,金属的相对原子质量越大,生成的氢气越少;生成的氢气越多,金属的相对原子质量越小。 - 当等量的酸分别和足量的金属反应(金属过量)时,反应产生氢气的量由酸的量决定,最终产生氢气的量相等。 - 两种或多种金属与稀酸反应时,反应的快慢(即相同时间内产生氢气的多少)由金属的活动性决定,在温度、金属颗粒大小和稀酸溶液溶质质量分数一定的条件下,金属的活动性越强,生成氢气就越快;生成氢气越快,说明金属的活动性就越强。在图像中,纵坐标通常为产生氢气的量,横坐标可能为时间、消耗酸的质量或消耗金属的质量。 2. **金属与盐溶液的反应** - **反应方程式及现象(以铁丝浸入硫酸铜溶液为例)** - 反应方程式:\(Fe + CuSO_{4}=FeSO_{4}+Cu\),现象为浸入溶液中的铁钉表面覆盖红色物质(铜),溶液由蓝色逐渐变为浅绿色。 - **反应条件及规律** - 金属(钾、钙、钠除外)的活动性强于盐中金属阳离子对应的金属;盐必须可溶于水。当多种金属和多种盐溶液反应时,最活泼的金属先与最不活泼的金属盐反应,再轮到较活泼的金属或金属盐反应。例如向一定量的硝酸银和硝酸亚铁混合溶液中加入锌粉,金属活动性顺序为锌>铁>银,锌先与硝酸银反应,硝酸银完全反应后,若锌还有剩余,则锌再与硝酸亚铁反应。 3. **金属与酸性溶液中的氢离子反应(以酸性溶液与金属反应为例)** - 酸性溶液中的氢离子(\(H^{+}\))会与金属发生反应,如形成氢气,同时金属逐渐溶解,但未明确具体金属时无法给出确切方程式。 4. **特殊金属与溶液反应(如金属铋与稀硝酸反应)** - 放入金属铋,加入稀硝酸,加热试管,冷却后加水稀释,反应方程式为\(Bi + 4HNO_{3}=Bi(NO_{3})_{3}+NO\uparrow+2H_{2}O\)(根据给出的后续反应推测铋与稀硝酸反应的可能方程式),现象未明确提及,可能有气体产生等现象。 5. **金属与水反应(以金属钾与水反应为例,虽然未明确要求,但属于金属与溶液相关反应类型)** - 金属钾与水反应:\(2K + 2H_{2}O = 2KOH+H_{2}\uparrow\),现象是反应剧烈,可能有燃烧、爆炸等危险现象(因为反应放出大量热和氢气)。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>
When a solution of a solution of The first was: <<Al3 +>+3AH^{->><Al3 +>>(Ox)_{3}>. At this time, a white deposit could be observed in the solution. If he continued to add the solution of the solution of the NaH solution, the reaction would occur. The white precipitations that were produced before would gradually disappear. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
There is no such substance as lead and aluminum. You may want to ask about the reaction of meta-aluminum and sulfuric acid. When the amount of sulfuric acid is insufficient, the reaction equation is: NaAlO <2>+ HNO <2>+ H <2> O = AI (OR)+ NaNO <2>, which is a white deposit when the sulfuric acid is added. When the amount of sulfuric acid was sufficient, the reaction equation was: NaAlO <2>+4HNO <3>= NaNO <3>+ AI (NO <3>)<3>+2H <2> O. The phenomenon was that the white deposit disappeared when the sulfuric acid was added and shaken. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The equation for the reaction between aluminum ions and carbonates is: 2Al3 + +3CO32- +3H2O === 2Al3 + 3CO2. The analysis of the reaction phenomenon was as follows: When aluminum ions (Al3 +) came into contact with carbon dioxide ions (CO32-), theoretically, they would form aluminum dioxide, but aluminum dioxide was a weak acid and weak base salt, and it was easy to decompose in an aquatic solution. In the process of digestion, aluminum ions combined with the hydrogen ions in the water to form aluminum trioxides. At the same time, the carbon dioxide ions came into contact with the hydrogen ions. As the carbon dioxide was unstable and volatile, it decomposed to produce carbon dioxide gas. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
It was too general to say that it was a phenomenon caused by the reaction of colorless solution with sulfuric acid. You have to tell me what is in this colorless solution. Is it a salt solution, an alkali-based solution, or something special? Otherwise, I can't be sure what will happen. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
In different application scenarios, there were different substances that could replace the reaction of aluminum sulfuric acid solution. For example, in the sizing precipitating agent of paper production, the aluminum aluminum could replace the aluminum sulfuric acid; in the treatment of waste water, the polyaluminum could replace the aluminum sulfuric acid to form a neutral sizing system with the anionic-dispersed gum. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
In the paper production, aluminum aluminum could be used as a sizing precipitating agent instead of aluminum. In water treatment, polyaluminum and iron could be used to replace aluminum to improve the removal rate of Toad, residual aluminum and turbid. In waste water treatment, polyaluminum could replace aluminum. The neutral sizing system composed of polyaluminum and anionic-dispersed resin could achieve neutral sizing without making more changes to the original system. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reaction between aluminum and iron dioxide (thermit reaction) experiment was as follows: ** 1. Experimental Materials ** Materials such as aluminum powder, iron dioxide, aluminum strip, alcohol lamp, paper funnel, iron frame, etc. were required. ** 2. Experimental Steps ** 1. A small amount of dried iron dioxide and an appropriate amount of aluminum powder were evenly mixed and placed in a paper funnel. A small amount of potassium peranate solid was added to the mixture, and a piece of magnetite strip that had been polished with sandpaper was inserted in the middle (the polishing was to remove the oxide-film on the surface of the magnetite strip for ignition). 2. He ignited the magnum strip. ** 3. Experimental Phenomenon ** 1. It immediately reacted violently. 2. It gave off a dazzling light and produced a large amount of smoke. 3. The paper funnel was burnt. 4. Some red-hot liquid beads fell onto the fine sand in the evaporating dish. After the liquid beads cooled down, they turned into a black solid. ** 4. The chemical reaction equation ** Fe2 O2 + 2Al2 = high temperature = Al2 O2 + 2Fe2. This reaction was a replacement reaction and a reduction reaction. There was no catalyst involved in the reaction. ** 5. Points to note ** 1. The paper funnel inside the glass funnel should be thicker and moistened with water to prevent damage to the funnel. 2. The evaporating dish should be lined with a suitable amount of fine sand to prevent the evaporating dish from exploding and to prevent the molten liquid from splashing out and hurting people. 3. The experimental equipment should not be too close to people to prevent them from getting injured. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>