The reaction conditions between acid, base and salt in junior high school chemistry
1. ** Condition of the metathesis reaction **
- For acid + base = salt + water (neutralizing reaction), at least one of the acid and base involved in the reaction was easily dissolved in water.
- Acid + salt = new acid + new salt. If the salt in the reagent is difficult to dissolve, then the product must be dissolved. The reaction between acid and salt is a metathesis reaction in an aquatic solution. The conditions for the metathesis reaction must be met.(There are precipitations, gas, or water). For example, when limestone (CaCO) is used to produce CO2 in the laboratory, only sulfuric acid can be used, because the CaSOformed by the reaction of CaCOand sulfuric acid is slightly dissolved and will cover the surface of CaCOto prevent the reaction from continuing. It is necessary to master the reaction of weak acid salt (such as Na
Junior high school chemistry, what are the reactions of the reactions of the salt?
In junior high school chemistry, the following reactions could occur with the presence of NaCl3: 1. The reaction between the solution of NaCl2 and the solution of silver nitrates was a metathesis reaction. The chemical equation was: NaCl2 + AgNO2 = NaNO2 + AgCl2, which would produce an unresolvable precipitable silver chloride-like substance. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Formula of Carbonic Acid and Salt Salt
Carbonic acid does not react with NaCl3. According to the possible reactions, NaCl2 + H2CO2 = NaHCO2 + HQ or 2NaCl2 + H2CO2 = Na CO2 + 2HQ, this was a weak acid making a strong acid, which was impossible to happen. Moreover, the reverse reaction of these two equations could be carried out to eventually produce NaCl2, H2O, and CO2. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction equation of acid and acid base indicator
The chemical equation of the reaction between acid and indicator: KHIn/(H+)=(In-)/(HIn)=a/(a-c). Using litmus as an example, the equilibrium of the ions was HIn = In- + H+. However, it should be noted that the acid and base indicator will change color when it meets an acidic or basic solution. The actual color change is the acid and base indicator, not the solution itself. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Acid base reaction carbon dioxide
Acid and base reactions can produce carbon dioxide. For example, the reaction of soda ash (Na_{2}CO_{3}) with an acid (such as sulfuric acid,<anno data-annotation-id ="00000000 - 4110 - 4410-a110-a1100111000"> ClCl3 </anno>) will produce carbon dioxide. The reaction equation is <anno data-annotation-id ="2c3cd00 - 4c50 - 4c50 - 4c50 - 9c51100000000"> Na_{2}CO_{3}+2Cl3 + 2Cl3 = 2NaCl4 + H_{2}O+ CO2}</anno></anno>. In the laboratory, diluted sulfuric acid reacted with marble (the main component of calcium dioxide) to produce carbon dioxide. The chemical equation was [CaCO3]+2HQ = CaCl2 + H2O + CO2]. The reaction between edible alkali-based and acid could produce carbon dioxide. When the dough fermented too much and had a sour taste, edible alkali-based could neutralize the sour taste. At the same time, the reaction between alkali-based and acid produced carbon dioxide to make the dough more fluffy and puffed. Baking soda (acidic) could also produce carbon dioxide when it reacted with acidic substances. For example, when white vinegar (acidic) and baking soda were mixed at home, they would react to produce carbon dioxide, which could be used for simple scientific experiments. The carbon dioxide produced by the reaction could make the balloon bulge, and the gas could extinguish the flame. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the reaction of salt in lead-acid batteries?
The use of salt in lead-acid batteries would cause the concentration of sulfuric acid to decrease, thereby reducing the capacity of the battery. To be specific, adding salt would cause the lead sulfuric acid in the battery to crystalize, forming large crystals that were difficult to dissolve, causing the battery capacity to decrease or even be scrapped. Therefore, adding salt would have a negative impact on the lead-acid battery and could not be repaired.
What is the phenomenon of acid and base neutralizing reaction?
The reaction of strong acid and strong base generally did not have obvious experimental phenomena (such as settling, bubbles, dissolving and disappearing of indissolvable substances, color change of solution, etc.). However, in daily life, there were many applications of the alkali-base neutralizing reaction that reflected certain phenomena. For example, when the alkali-base neutralizing reaction was used to treat gastric acid, the symptoms of hypergastric acid (such as acid acid reversal and burning sensation in the stomach) would be alleviated; When slaked lime was used to alleviate the acidic soil, the state of the acidic soil would be improved, which was conducive to plant growth; When vinegar was used to remove scale, the scale would be dissolved; After mosquito bites, applying soap water could reduce redness, swelling, pain, itching and other symptoms. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reactions of acid, base and salt are all metathetical reactions
Not all reactions between acid, base, and salt were metatheses. In junior high school chemistry, the reaction of acid and metal to form salt and hydrogen, such as 2AI +3H ^SO = AI ^(SO)+3H ^^, this reaction is not a metathesis reaction. Alkali reacted with non-metallic compounds to form salt and water, such as 2NaOx + CO2 = Na Chi CO2 + H Chi O, which was also not a metathesis reaction. The reactions of neutralizing acid and base (acid + base = salt + water), acid and salt (acid + salt = new acid + new salt), base and salt (base + salt = new base + new salt), salt and salt (salt + salt = two new salt), and metal oxide-acid (acid + metal oxide-salt + water) were all metathetical reactions. Moreover, the metathesis reaction had to meet certain conditions. The reagent had to be dissolved in water or acid, and the product had to be either one or two of the three substances of precipitations, gas, and water. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Seeking the mind map of high school chemistry reaction rate!
As someone who loves reading novels, I don't have the ability to create a mind map. But I can provide you with information about high school chemistry reaction rates to help you understand them better. High school chemistry reaction rate usually included the following two main aspects: the chemical reaction rate constant and the effect of the concentration of the reagent on the reaction rate. 1 Reaction rate constant The rate constant of a chemical reaction is the ratio of the concentration of the reagent to the rate of the reagent. It is usually expressed in units of millimoles per second (m/s) or micromoles per microsecond (m/s) with a number between 1 and 10. The chemical reaction rate constant is the basic unit to describe the chemical reaction rate. It is related to the concentration of the reagent and the rate of the reagent. Effect of the concentration of the reagents on the reaction rate The effect of the concentration of the reagent on the reaction rate referred to the change in the reaction rate when the concentration of the reagent increased. Generally, an increase in the concentration of the reagent will lead to an increase in the rate of the reagent. A decrease in the concentration of the reagent will lead to a decrease in the rate of the reagent. This relationship can be expressed by the following formula: Reactant Concentration (C1) = Reactant Rate (V1) + Reactant Rate (V2) where V1 and V2 respectively represent the increase in the rate of the reagent and the decrease in the rate of the reagent when the concentration of the reagent increases. It should be noted that the chemical reaction rate constant and the concentration of the reagents have different effects on the reaction rate, but they usually interact. In addition, different types of chemical reaction rate constant and reagent concentration had different effects on the reaction rate.
Junior high school physics and chemistry knowledge points summary
** I. Introduction of Junior High School Physics Knowledge Points ** 1. ** Matter and molecules ** - Matter was made up of molecules. There were gaps between the molecules, and there were attractive and repulsive forces between the molecules. 2. ** Measuring related ** - The reading of the scale should be read to the next place of the division value. When using the scale to measure, it can be measured many times to reduce the error. - The measuring cylinder could be used to measure the volume of liquid and the volume of solid using the "drainage method." - Using a scale to measure mass followed the principle of "left object right code". 3. ** Density-related ** - The density of the same substance was related to its state. For example, water and ice had different density due to their different states. The density of water is 1 (<rho_{water>= 1.0> times10 ^{3}kg/m^{3}=1g/cm^{3}). 4. ** Sports related ** - The movement and stillness of matter were relative to a reference object. The reference object could be chosen at will, but the object being studied could not be used as a reference object. With respect to the reference object, the position of the object changes and the object moves. - The average speed represents the speed of an object's movement over a period of time or distance, and the instantaneous speed represents the speed of an object's movement at a certain position or time. 5. ** Sound-related ** - All objects that made sound were vibrating. Sound needed a medium to travel. Usually, sound traveled the fastest in solid objects, followed by liquids, and the slowest in gases. - The boundaries between music and noise were not strict. It was related to the location, time, environment, and people's mood. The three elements of music included pitch (high or low), loudness (loud or low), and timbre (distinguishing different vocal bodies). The prevention and control of noise should start from the sound source, the transmission path, and the human ear. 6. ** Mechanics related ** - The effect of force was mutual. The object that exerted force was also the object that received force. The effect of force is to cause the object to change shape and change the state of motion of the object. Whether the state of motion of an object has changed can be determined by changing one or both of the speed and direction, or whether the object is not in a state of static or uniform linear motion. The three elements of force were the magnitude, direction, and point of effect of the force. There was a simple way to draw a force diagram. The spring force tester was made according to the principle that the greater the pulling force, the greater the spring's displacement. ** 2. Junior high school chemistry knowledge summary ** 1. ** The chemical properties of common substances ** - Common substances have different colors, such as red solid copper and iron dioxide; green solid basic copper carbonates; blue solid copper dioxide and copper sulfuric acid crystals; purplish-black solid is potassium Permanganate, etc. Among the liquids, colorless liquids such as water and hydrogen peroxide-dioxide; blue solutions such as copper sulfate-dioxide solution; light green solutions such as iron sulfate-dioxide solution; yellow solutions such as iron sulfate-dioxide solution; purplish-red solutions such as potassium peroxide-dioxide solution; and purple solutions such as litmus solution. Among the gases, the reddish-brown gas was nitrogen dioxide, the yellow-green gas was Cl2, and most gases such as oxygen and nitrogen were colorless gases. 2. ** Chemistry related (Elemental characteristics)** - For example,"I'm hydrogen, I'm the lightest, and the rocket depends on me to transport the satellite. I'm helium, I'm a scoundrel, I'm the worst at losing and gaining electrons. "I'm lithium, so the density is low. I'll soak in water and acid…" 3. ** Other Important Knowledge Points ** - In ancient China, the three major chemical processes were paper making, gunpowder making, and porcelain burning. There were three types of oxygen reactions: explosion, combustion, and slow oxygen. The three kinds of particles that make up matter are molecules, atoms, and ions, while the three kinds of particles that are not charged are molecules, atoms, and neutrons. The novel "Watching the Moon on Fish Island" is equally exciting. Everyone is welcome to click and read it!
What are the reactions to the heat release in junior high school chemistry?
Based on context alone There were mainly the following types of reactions in junior high school chemistry: 1. For example, charcoal burning in oxygen (C + O <2>= ignition = CO <2>), hydrogen burning in oxygen (2H <2>+ O <2>= ignition = 2H <2> O), and burning of aluminum bars in air (2MG + O <2>= ignition = 2Magnesia). The combustion process releases a lot of heat. 2. Reaction of metals with acid: For example, metals such as titanium, iron, and other metals react with dilute sulfuric acid or dilute sulfuric acid. For example, the reaction between lithium and dilute sulfuric acid (Mn + H ^SO2 = Mn ^SO2 + H ^^), and the reaction between lithium and dilute sulfuric acid (Mn +2HQ = Mn ^Cl2 + H ^) would release heat during the reaction. 3. Acid and base neutralizing reaction: For example, the reaction of sulfuric acid and sulfuric acid with sulfuric acid (H <2> SO2 <3>+2Kou <3>= K <2> SO2 <3>+2H <2> O). Acid and base neutralizing reaction is usually an exothermic reaction. 4. The reaction between calcium dioxide and water: CaO + H ^O = CaO ^. This reaction will release a lot of heat. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>