How to become a chemistry master, chemistry master experience talks about how to learn chemistry wel

Some people are "rubbing the net" for classes, and some people are pretending to clock in under the covers!

If you want to become a top student, you must develop these six good habits!

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.

Some people are "rubbing the net" for classes, and some people are pretending to clock in under the covers!

If you want to become a top student, you must develop these six good habits!

I am a chemistry teacher, and I finished teaching students about concentration half a month ago, and I will give you a specific analysis of this solution idea:

For substances with crystalline water dissolved in water, the solute does not contain crystalline water, that is, the solute at this time is Na2CO3, and at the same time n (

According to the formula n=m m, n(

So n(na2co3)=

Then according to C(Na2CO3)=N(Na2CO3) V solution = (2) according to C(ion) = C (substance) * the number of ions in the chemical formula, C(Na+)=C(Na2CO3)*2= is obtained

3) Take 20ml of the solution and dilute it with water, before and after dilution, N(Na2CO3) can not be changed, with formula.

C concentrated v concentrated = c dilute v dilute, bring in the number, dilute, and get v dilute = 250ml, so the volume of water added is 250ml-20ml = 230ml

The molar mass is 286

is 1, c=2, cna+=

3. The amount of solute before and after dilution remains unchanged.

Set to add V liters of water.

v = l = 5 ml.

17% Al2O3 3% Fe2O3

The easy way to solve this kind of problem is to directly set 100g of purple sand to sue Kai. then there are 17gal2o3 and 3gfe2o3

There are 9gal, 8go in the calculation. Then the mass fraction of Al is 9 100 = 9% and the mass fraction of O in Al2O3 is 8 100 = 8%.

Count Fe2O3The mass friend bond of Fe in 3Gfe2O3 and the mass fraction of O of Fe2O3 are called.

The mass fraction of O in Fe2O3.

7.（1）a:sio2 b:

casio3 d:si（2）sio2 +caco3==casio3 +co2（3）na2sio3+2hcl==h2sio3+2nacl8.(1) **Chlorine bleaching.

2) Absorb water vapor The cloth strip in B does not fade, and the cloth strip in C fades Cl2+H2O==H++Cl-+HCl

3) It is easy to cause chlorine leakage and pollute the environment: Draw a beaker containing sodium hydroxide solution in D to absorb chlorine.

The ionic equation in d is: Cl2+2OH-== Cl-+ClO-+H2O

The function of concentrated sulfuric acid is to remove water vapor.