[Characteristics of question types] Classification thinking is an important method of learning chemistry that divides the whole into categories and combines the categories into a whole. It is an important way to deeply understand concepts. Clarifying the standards for classificat

[Characteristics of question types]

The idea of ​​classification is an important way to learn chemistry by dividing the whole into categories and combining the categories into a whole. It is an important way to deeply understand concepts. Clarifying the standards for classification and grasping the similarities and differences of various problems under the standards are the key to using classification thinking to solve problems. There are two main types of questions: one is to divide the given substances into different categories according to specified standards, or to judge the relationship between categories (inclusion, juxtaposition, intersection); the other is to summarize the substances that have been classified Filter to find out the classification criteria. Classification thinking is actually the application of systematic thinking in chemistry. In essence, it is a form of systematic presentation of chemical concepts and knowledge from small to large, from outside to inside, and from phenomenon to essence.

[Main examination content]

. Classification of substances;

2. Classification of chemical changes;

3. Classification of materials;

4. Classification of chemical fertilizers

Error-prone warning:

. Pure substances are composed of one substance, not It is composed of one element;

2. element must be a pure substance, and then composed of one element, and the relationship between the two cannot be reversed;

3. oxide must be a pure substance, and composed of two elements, and among them One is oxygen element ;

1

2

3

4

5

6

#chemistry# #I want to be on the headlines# #I am creating in the headlines# # Test center#