Reaction Law of Nitric Acid with Metal and Nonmetal1. ** Reaction law of nitrates and metals **
- ** Passivation phenomenon **: Metal such as iron, aluminum, and aluminum are easily dissolved in dilute sulfuric acid, but they are not dissolved in cold concentrated sulfuric acid. This is due to the occurrence of a passive phenomenon.
- ** Reaction with non-active metals **
- When the metal activity order table showed that the metal reacted with the metal after hydrogen, it could be seen that the metal was first oxided by the acid, and then the metal reacted with the acid to form nitrates. The main reduction product of concentrated sulfuric acid was NO2, and the main reduction product of diluted sulfuric acid was NO. For example, the reaction of silver with concentrated sulfuric acid: <2Ag +2HNO3 (concentrated)= Ag2O +2NO2 + H2O>,<Ag2O +2HNO3 = 2AgNO3 + H2O>, the total reaction is <2Ag +2HNO3 (concentrated)= AgNO3 + NO2 + H2O>; The reaction of silver with diluted sulfuric acid: <3Ag +4HNO3 (diluted)= 3AgNO3 +NO +2H2O>.
- ** Reaction with active metals **: When sulfuric acid acts with the metal before hydrogen in the metal activity order table, in addition to the corresponding nitrates, the sulfuric acid may be further reduced to substances such as <anno data-annotation-id ="00000000 - 4000 - 4000 - 4000 - 8000 - 9000000000"></anno>,</anno>, and </anno>. In general, active metals react with concentrated sulfuric acid to form <anno data-annotation-id ="00000000 - 4000 - 4000 - 8000 - 8000 - 90000000000"> NO2 </anno>, dilute sulfuric acid to form <anno data-annotation-id ="0000000 - 4000 - 4000 - 9000 - 900000000000"> NO </anno>, and extremely dilute sulfuric acid to form <anno data-annotation-id ="20000a000000 - 90000000000"></anno></anno></anno>. For example, the reaction of calcium with different concentration of sulfuric acid:
- \(Mg + 4HNO_3(16mol/L)=Mg(NO_3)_2+2NO_2↑+2H_2O\)
- \(3Mg + 8HNO_3(6mol/L)=3Mg(NO_3)_2+2NO↑+4H_2O\)
- \(4Mg + 10HNO_3(2mol/L)=4Mg(NO_3)_2+N_2O↑+5H_2O\)
- \(4Mg + 10HNO_3(1mol/L)=4Mg(NO_3)_2+NH_4NO_3+3H_2O\)
- \(5Mg + 12HNO_3(0.5mol/L)=5Mg(NO_3)_2+N_2↑+6H_2O\)。Moreover, the thinner the sulfuric acid was, the lower the valency of the nitrogen in the reduction product. However, it could not be mistaken that the dilute sulfuric acid had a stronger oxidisation ability than the concentrated sulfuric acid. In fact, the more concentrated the sulfuric acid was, the stronger the oxidisation ability was.
- ** Special Metal Reaction **: Metal such as tin, stibine, and tungsten do not have much effect on nitrates. They may form an oxide-like substance that is not dissolved in nitrates, but they cannot form nitrates.
2. ** Reaction law of sulfuric acid and non-metals **: When sulfuric acid and non-metals react, it only shows the oxidisation property.
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What is the Magnesium Citrate Story?The Magnesium Citrate story could also be related to its uses. For example, it's commonly used to relieve occasional constipation. It works by drawing water into the intestines, which helps to soften the stool and promote bowel movements. Many people have stories about how it has helped them with their digestive issues, which could be part of what is meant by 'the Magnesium Citrate story'.
Magnesium Weight Loss Success Stories: How Does Magnesium Aid in Weight Loss?3 answers
2024-11-02 17:46
Magnesium can help with weight loss in a few ways. Firstly, it helps regulate blood sugar levels. Stable blood sugar means less cravings for sugary and high - calorie foods. For example, if your blood sugar spikes and then drops, you'll feel hungry and reach for junk food. Magnesium helps prevent that. Secondly, it plays a role in metabolism. A proper magnesium level can boost your metabolic rate, allowing your body to burn calories more efficiently. So, many people who have included magnesium - rich foods or supplements in their diet have seen positive results in their weight loss journey.
Magnesium-aluminum and oxygen reaction experimentThe following is related to the experiment of the reaction between magnesium-aluminum and oxygen:
** 1. Reaction between Magnesium and oxygen **
1. ** Reaction Phenomenon **
- When it burned in the air, it would release heat and emit a dazzling white light, forming a white solid.
- The reaction was more intense in oxygen than in air.
2. ** chemical equation **:<2MG + O_{2}><stacking>{=<<=<<=>>>=<>>2MgO\)
3. ** Points to note in the experiment **
- Due to the intense combustion of the titanium, safety must be paid attention to during the experiment and a certain safe distance must be maintained from the titanium.
- When burning, it will produce a strong light, which may cause damage to the eyes, so don't look directly at the burning magnetite.
** 2. Reaction between aluminum and oxygen **
1. ** Reaction Phenomenon **
- When aluminum reacted with oxygen in the air, a layer of dense aluminum dioxide film would be formed on the surface of the aluminum. This film would prevent the aluminum from being further oxided, so the reaction between aluminum and oxygen in the air was not so intense. The surface of the aluminum gradually lost its metallic luster.
- If the aluminum foil was heated in oxygen, the aluminum foil would melt, but it would not drip. This was because the melting point of the aluminum dioxide film was very high, and it would hold the molten aluminum and emit a dazzling light during the reaction.
2. ** chemical equation **:<4AI +3O_{2} = 2AI_{2}O_{3}>
3. ** Points to note in the experiment **
- When conducting the experiment of heating the aluminum foil in oxygen, the purity and sufficient supply of oxygen must be ensured.
- When heating the aluminum foil, use a suitable heating tool, such as an alcohol lamp, and heat it evenly.
** 3. Experimental design (Comparing the reactions of oxygen with aluminum and aluminum)**
1. ** Experiment Purpose **
- Comparing the intensity of the reaction between aluminum and oxygen, the reaction products, and so on.
2. ** Experiment Steps **
- He took a suitable amount of aluminum foil and a suitable amount of aluminum strip, and polished them to make them bright (to remove the thin film of oxygen on the surface).
- Heat the aluminum foil and the aluminum strip separately over the flame of an alcohol lamp (or ignite them in a gas collector filled with oxygen).
- Observe and record the intensity of the reaction between the two (such as the reaction of the aluminum strip is more intense, emitting a dazzling white light; the surface of the aluminum foil gradually changes when heated, and it will also emit light when ignited in oxygen, etc.), and the phenomenon during the reaction (such as the combustion of the aluminum strip to form a white solid, the formation of a white aluminum dioxide film on the surface of the aluminum foil, etc.).
- After the reaction, the reaction product was analyzed (it could be judged by physical properties such as color and state, or it could be further analyzed by chemical methods).
3. ** Experiment result analysis **
- Based on the intensity of the reaction, it could be judged that the reaction between oxygen and titanium was easier than that of aluminum.
- Through the analysis of the reaction products, it could be determined that the reaction between the oxygen and the aluminum formed the aluminum dioxide.
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Reaction Type of Magnesium and Copper OxidesThe chemical equation of the reaction between copper dioxide (CuO) and lithium is: In this reaction, a simple substance (lithium) and a compound (copper) react to form another simple substance (copper) and another compound (lithium), which meets the definition of a displacement reaction, so this reaction type is a displacement reaction.
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