The chemistry exam must memorize the knowledge points in high school, and the knowledge points in th

1.Neutralizing Heat Concept:

In a dilute solution, the acid and the alkali are neutralized and reacted into 1molH2O, and the heat of reaction at this time is called the heat of neutralization.

2.The neutralization reaction between a strong acid and a strong base is in essence H+ and OH- reaction, and its thermochemical formula is: H+(AQ)+OH-(AQ)=H2O(L)ΔH=

3. The redox reaction is a reaction of electron transfer (or valence rise). The essence is electron transfer (including the gain, loss and displacement of electrons).

Characteristic: Rise and fall of valence. Oxidizing agent (oxidizing) - electrons obtained - valency decreased - reduced - reduced product.

Reducing agent (reducing) - loss of electrons - increase in valency - oxidized - oxidation products. Formula: Rise - Lose - (be) oxidized - Reducing agent - Gain - (be) reduced - Oxidant.

Compulsory courses 1 and 2 are all in the book, flip through the book, and look at the key experimental chemical formula phenomena. The entrance exam is not so difficult, normal heart.

Just read the book. If you can do the questions at the back of the textbook, you will definitely be able to pass the test.

Valency

Valence alkali metal elements, ag, h: +1cu: +1, +2f: of common elements

1ca、mg、ba、zn：+2fe：+2，+3cl：

1，+1，+5，+7al：+3o：-2mn：

2，+4，+6，+7s：-2，+4，+6p：-3，+3，+52、

Redox reaction definition: There is the essence of the reaction of electron transfer (or valence rise and fall): electron transfer (including the gain, loss and shift of electrons) characteristics:

Valency of the rising oxidant (with oxidizing) - electron gain - valency decrease - reduced --- reducing product reducing agent (with reducibility) - loss of electrons - valency rise - oxidized - oxidation product formula: - oxidant - --- reduce) reduction - reducing agent ---be) oxidation of the four basic types and redox reaction relationship reducibility gradually weakened.

Ionic Reaction Definition: Reaction with the participation of ionsElectrolyte: Compound that conducts electricity in aqueous solution or in the molten state Non-electrolyte: A book of ionic equations for compounds that do not conduct electricity in both the aqueous solution and the molten state.

The knowledge points that must be memorized in chemistry include chemical order, redox reaction, periodic table of metal activity, ionic reaction, exothermic reaction and endothermic reaction, careful discussion and inference of the transformation formula between various physical quantities, the dissolution of the concentration of a certain substance, and the atomic structure and properties of sodium.

Valency (valency of common elements).

Alkali metal elements, ag, h: +1 f:—1ca, mg, ba, zn:

2 cl：—1，+1，+5，+7cu：+1，+2 fe：

2，+3 o：—2 s：—2，+4，+6al：

3 mn：+2，+4，+6，+7 p：—3，+3，+5 n：

Redox reactions.

Essence: Electron transfer (including gain, loss and shift of electrons) Characteristics: Valency of ascending oxidant (oxidizing) - Electron gain - Valency decrease - Reduced - Reducing product Reducing agent (reducing) - Loss of electrons - Valency rise - Oxidized - Oxidizing product.