Senior 3 Final Winter Vacation Score Plan Chemistry .

Hello: According to the situation you gave, for galvanic batteries and electrolytic cells belong to electrochemistry, what you need to know is the distinction between cathode and anode and the specific reaction of cathode. The so-called cathode is the electrode where the reduction reaction of matter occurs; The anode is the electrode where the substance is oxidized.

Actually, it's easy to understand, you can imagine the reaction of electrolysis of water, the so-called positive oxygen and negative hydrogen is that the electrode connected to the positive electrode of the power supply produces oxygen, and the electrode connected to the negative electrode produces hydrogen. The essence is that the hydrogen ions in the water are electronically reduced to hydrogen at the cathode, and the oxygen elements in the hydroxide are oxidized to oxygen at the anode. You can think of it this way, for an electrolytic cell, it is powered by a power supply, and the electrode connected by the electrons from the negative pole of the power supply is the cathode, and then you can imagine that the electrons given by the power supply reduce the matter.

In this way, the cathode and anode can be distinguished. For galvanic batteries, it is necessary to figure out what substances are oxidized and what substances are reduced. The electrode of the oxidized substance gives electrons, which is the negative electrode, and the other pole is the positive electrode.

The electrode that is oxidized at the same time is the anode and the other end is the cathode. As long as you can figure out these basic questions, you don't need to do a lot of questions, and the sea of questions tactics is too time-consuming for high school electrochemistry.

For the rate of chemical reactions, all you need to know is the reaction rate equation, including structure, situation, and composition. Generally speaking, the reaction rate equation is determined by the concentration (or partial pressure) of the reactants participating in the reaction, independent of the product concentration. As long as there is enough reactant concentration, a certain reaction rate can be maintained, and it is important not to be affected by the product, and remember that the rate is not related to the product.

All that is relevant to the product is the chemical equilibrium. As for the details, it should be clearly written in the textbooks and related reference books, you can take a look. For this part, you can find some topics to do, and I personally recommend one or two questions a day, which does not take much time.

Finally, for college entrance examination students, there are still a few months, if you are not interested in chemistry, don't spend too much time on chemistry, just maintain the current state and make a little progress, you should spend time on the courses you like will have better results. I wish you success!

Galvanic battery: Generally, it is a reactive metal as the negative electrode, so you just remember the shrew. The cation moves towards the positive electrode and the anion moves towards the negative electrode. The positive electrode is a reduction reaction when the electrons are obtained, and the negative electrode loses electrons and undergoes an oxidation reaction.

Electrolytic cell: It is the anode that connects the positive electrode of the power supply, and the cathode that understands the negative electrode, the cation moves to the negative electrode, and the anion moves to the positive electrode. The cation (that is, the positive electrode) loses electrons and undergoes an oxidation reaction, and the oxidation difficulty is seen in this way

For example, in the metal activity sequence table, nano is more active than magnesium, and magnesium ions are more easily oxidized than sodium ions. Anions (that is, negative electrodes) are reduced by electrons, and it is easy to reduce: sulfur ions, iodine ions, bromine ions, hydroxide ions, oxylate ions.

You just remember that the anode has to lose electrons, and the negative electrode should understand.

Chemical reaction rate: increasing the pressure, increasing the concentration of reactants, increasing the temperature, and using catalysts can all accelerate the reaction rate. These are all things to remember.

Galvanic cells and electrolytic cells memorize typical reactions and principles, and the types of reaction rates are similar.

Review your notes, take a good look at your weak parts, and then do more questions.

There are no skills, more questions, and more summaries.

1. Chemistry mainly first understands the principles, then combines experimental phenomena and chemical equations, diligent memorization, and then combines some typical exercises to strengthen understanding and memory, and then pays attention to the comparison, induction and sorting of knowledge points. In fact, the questions are quite common, grasp the equations and various calculation formulas, and memorize the properties of various substances.

2. Preview before class. The day before class, be sure to take time to consciously preview what the teacher will talk about the next day. Learn to study first and then listen to the lectures.

3. Listen to every class. Listening to lectures is the core part of the learning process, and it is the main way to learn and master knowledge. Whether you can master the knowledge learned well in the classroom is the key to determining the learning effect.

If you can basically master the basic knowledge and skills you have learned in class, you will not have difficulty reviewing and doing homework after class.

4. Take good notes. To learn chemistry well, note-taking is also an important part. In addition to focusing one's attention and improving the efficiency of listening to lectures, note-taking is also a great help for post-class review.

So, learn to take notes and develop a good habit of taking notes. Therefore, while listening carefully, you should also take good notes.

5. Careful observation and hands-on experiments. Through demonstrations and student experiments, learning to observe the operation and phenomenon of the teacher's demonstration experiments, doing a good job in student experiments, and taking good laboratory classes are the foundation for learning chemistry well.