The new questions for the expansion, opening and inquiry of this year’s senior high school entrance examination are very likely The following test sites appear. These test sites often appear in the short answer questions section, which is easy to score and easy to lose points. Because the overall difficulty is not large, they often appear side by side, adding obstacles to the students, so that the students can make mistakes and lose points. For this test site, students should learn to analyze carefully and apply flexibly. Here are some knowledge points.
The chemistry knowledge of the senior high school entrance examination
Chemical formula and valence
Representation of pH-pH Description:
(1)pH=7, the solution is neutral; pH <7, solution is Acidic; pH > 7, the solution is alkaline.
(2) The closer to 0, the stronger the pH is acidic; the closer to 14, the stronger the pH is; the closer to 7, the weaker the pH of the pH solution is
, the closer to neutral.
Metal activity sequence table: (potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum, gold)
Description: (1) The more active the left metal is, the more the metal on the left can be displaced from the salt solution of the metal on the right.
Chemical knowledge of the senior high school Strong>
(1) Diamond, graphite: C
(2) Mercury, mercury: Hg
(3) Quicklime, calcium oxide: CaO
(4) Dry ice (solid carbon dioxide): CO2
(5) hydrochloric acid, hydrochloric acid: HCl
(6) sulfurous acid: H2SO3
( 7) Hydrogen sulphate: H2S
(8) slaked lime, slaked lime: Ca(OH)2
Chemical knowledge points in the middle school test
(9) caustic soda, caustic soda, caustic soda: NaOH
(10) soda ash: Na2CO3 sodium carbonate crystal, soda ash crystal: Na2CO3 · 2O 10H
(11) hydrogencarbonate Sodium, acid sodium carbonate: NaHCO3 (also known as baking soda)
(12) cholesteric, blue sputum, copper sulphate crystal: CuSO4· 2O 5H
(13) patina, Malachite: Cu2(OH)2CO3 (substances that decompose to form three oxides) (14) Methanol: CH3OH Toxic, blind, death
(15) Alcohol, Ethanol: C2H5OH
(16) Acetic acid, acetic acid (16.6 °C glacial acetic acid) CH3COOH (CH3COO
(17) Ammonia: NH3 (alkaline gas)
(18) Ammonia water, ammonia monohydrate: NH3·2O (a common base with a basicity of alkali, a H-base free of metal ions)
(19) Sodium nitrite: NaNO2 (industrial salt, toxic)