Third-year review of chemical winter how good planning
Solution, acid-base chemistry of the salt section is a turning point in junior high school, they all thought that the chemical will be back from a score of subjects can be elevated to a new level.75% of junior high school chemistry and they have a problem is directly related. Solution, pH and salt to master this part of the knowledge of good and bad, directly determines the performance of students in the grade of major examinations. Their relationship to the kinds of questions are comprehensive, integrated multiple-choice questions, the mysterious Tuiduan Ti, seemingly complex test questions and “persistent” in math.
On the solution, it is important examinations, almost all the more difficult reactions in solution, the math questions are bound to the last with the mass fraction of the solute. In the winter of Beijing New Oriental’s classroom, as to how to learn the content of this unit must be the guide in the winter learning and independent study, the strengthening of the material in solution the relationship between research and knowledge, so saturated solution and unsaturated solution of differences and mutual transformation, solubility curve, the difficulty of the solute in the low mass fraction of computational problems can be resolved quickly and correctly use the law beats by dr dre studio michael jackson silver headphones. Eliminate rote memorization and rote.
On acid-base salt, junior high school will last a basic reaction types – metathesis reaction to introduce knowledge and use of salt and acid-base reaction between oxides of some of some complex experimental and computational studies and calculations. And in this part of the acid salt, PH value and the indicator is a difficult test, especially in response to acid and alkali to do with phenolphthalein indicator to determine whether or not a reasonable response to the test questions, but also in the examination of each city and will test to one point. As occurred in the pH and salt among the math questions using images that reaction is an important test sites one day. The test sites, one of the more difficult material identification, separation and purification but also students of the headache. Learning this part of the binding reaction to common law and the important nature of the material layers to be progressive, categorization, classification, analysis of some kinds of questions the basic ideas and laws, so as to be learn, learn.
Inference, experimental, computational part of
Three days of this winter, in addition to the solution, pH and salt content of the system to learn this part of the first onset of learning, but also there is no systematic study has already summarized the kinds of questions – inference, computation, and the basis of chemistry -experiment, the three were part of the knowledge of our students dubbed the “three big mountains of chemistry.” More than 80% of the students of these three kinds of questions do not have a good solution, almost all of the students that these three kinds of questions are very complex. But no matter how “complex” kinds of questions is also a regular, learning methods need to pay attention. Tuiduan Ti must be familiar with the common nature of the material and material-response relationship between the categories and the resultant species, a large number of equations must not memorize the feel finished school beats by dr dre studio new york yankees white headphones. Computing must have an overall awareness of this problem in the end want to understand what our perspective and knowledge from the point to solve, rather than a solution to get the problem began, so will only increase the problem-solving time, and not very good solution ideas. Experiments more attention to understanding the whole-question analysis, to understand what the problem raised questions in the end, the design of the experiment is to analyze the problem on which research to solve problems which need to pay attention when the real problems.
On the math, there have been more problems. But from 2008 to 2011 in the test, has been through the solute mass fraction and the metathesis reaction to produce gas or precipitate a series of calculations.
We do not recommend winter phase students up on the simulation questions in the exam or the comprehensive calculation problems more difficult to study, because that will cause students to repeatedly practice the math too difficult after a heart that fears to give up. Recommend starting with a comprehensive subject is not particularly strong practicing.
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