/question/8599757 1.html
/question/886 13 145 . html? si=2
/question/88905493.html? si= 10
I'll give you a new learning method. If you ask for information, please give points first. If you get extra marks, you will get more study materials.
/question/9 1002 136 . html
Review methods for the 50-day four-round senior high school entrance examination help you. (I am original, posting is forbidden) This plan is a comprehensive review, trying to keep up with the teaching ideas of school teachers. You can also design your own review schedule. There is not much time before the senior high school entrance examination. This is the review progress. For yourself, you can compare your review progress according to the following timetable. Most schools have now entered three rounds of evaluation. Your review schedule can be adjusted according to your own situation.
First round: review of basic knowledge and special topics in all subjects and units: (20 days)
1. Read the textbook carefully from beginning to end (I call it a soldier in the field).
Draw the relevant knowledge points and mark the key points with a red pen.
2. Wake up the learned knowledge and pick up the forgotten knowledge.
Buy a tutorial book with one or two rounds of review and do some corresponding exercises to help you understand and remember. (such as counseling, 3-year simulated 5-year senior high school entrance examination, etc.). When you do the problem, you should read the relevant knowledge of the problem that you can't, and make a mark to indicate that I have read this but can't.
4. Summarize formulas, theorems, essentials, words, grammar, poems, literary foundations, chemical equations, reaction principles, various experiments and so on. . . .
The second round: the self-test of the senior high school entrance examination questions in various provinces and cities over the years (simulation and intensive review);
(Time: 15 days)
1. Do some exercises in the single-subject senior high school entrance examination over the years. You can look at the answer and ask the teachers and classmates. The purpose of reading the answers is to learn how to answer the questions in the senior high school entrance examination and correct the bad problem-solving habits and methods in your usual study. Write down the wrong questions in red ink. If you can't write them down, correct them and stick a small note. Each copy should be corrected by yourself so that you can browse it before preparing for the exam.
2. Summarize the problem-solving methods and some common knowledge, but there is no knowledge that must be learned in the textbook. This part of knowledge should be recorded in a small notebook for easy browsing before the exam. Because you can't use it every day, you will forget it.
3. Set a set of wrong questions, and don't copy them again. If you want to keep the problem sets you have done in the senior high school entrance examination, you can order them together. It is best to use paging folders to store materials.
4. All subjects should do the simulation questions of the senior high school entrance examination according to the time of the senior high school entrance examination, don't look at the answers, finish and record the time within a limited time, and pay attention to whether the time for doing the papers is shortened or extended. Complete your own modifications and find out the shortcomings. Keep the test papers with errors and sort them. Spares can't be thrown away. Keep the test papers of each unified mock exam and bind them together. If you have the ability, find simulation questions in other test areas (counties), as well as pre-test simulation questions in key middle schools (schools with senior high school entrance examination teachers).
The third round: strengthening the test center of the senior high school entrance examination, and finally summing up: (time: 15 days)
1. Find the finale of each school to do, or over the years, which is the direction of the senior high school entrance examination.
2. Questions not mentioned before may or may not come out this year when reviewing here.
3. Find the children of classmates or parents and friends to exchange the finale exercises and increase their popularity.
The fourth round: browsing before the exam, (3 days before the exam)
1. Take out all the knowledge points (books) and summaries you have learned before. At this time, do what you should do, and do what you shouldn't do. That's all.
Take out all the problem sets I have done before and see if there are any mistakes, and see when I will make mistakes in solving problems. These mistakes should be avoided in the senior high school entrance examination.
3. Read the textbook knowledge from the beginning again, take a look at the key points and points you have drawn, and remember it again, which is conducive to thinking during the exam.
Here I'll give you some review methods. If not, I still have some study materials for you to review. (belonging to wolf friend, word version. It's free, but leave your QQ or email address, preferably QQ email address. I'm Wang Yang 200870 1, and I keep my word. )
Provide the following study materials, and select ten documents if necessary.
Sort out some key topics of electricity in the 2008 senior high school entrance examination
There are many ways to measure the rated power of small light bulbs skillfully.
A complete interpretation of the electrical inquiry questions in the senior high school entrance examination
Compilation of the finale of electricity in senior high school entrance examination
Physics experiment problem set for senior high school entrance examination
23 Formulas Commonly Used in Junior Middle School Mathematics
Selection and analysis of the test questions of mathematics piecewise function in senior high school entrance examination
Analysis of the Math Final Question of the Senior High School Entrance Examination (1) (This question has been uploaded to the website of Tian Li 100, with 5 points cut).
Analysis of the Math Final Question of the Senior High School Entrance Examination (2) (This question has been uploaded to the website of Tian Li 100, with 5 points cut).
Analysis of the Math Final Question of the Senior High School Entrance Examination (3) (This question has been uploaded to the website of Tian Li 100, with 5 points cut).
Test bank for experimental operation of senior high school entrance examination (chemistry).
Summary of knowledge points of chemistry review in senior high school entrance examination. rar
Encyclopedia of the difficulty of English grammar knowledge in senior high school entrance examination. rar
Ninth grade Chinese review preparation plan
Learn Chinese well and give you eight golden keys.
Common sense of Chinese and literature in senior high school entrance examination
General review of classical Chinese in the 2009 senior high school entrance examination
"Prepare for the 2009 senior high school entrance examination Chinese review basic articles?" Modern reading "
"Prepare for the 2009 senior high school entrance examination Chinese review basic articles?" Modern reading reference answer "
Senior high school entrance examination composition: teach you three tricks to write a wonderful beginning
Guidance on composition review of senior high school entrance examination: how to write a good propositional composition
Chemical supplementary information:
I. Scientific names, common names and chemical formulas of substances
(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: H2SO4 (7) bisulfate: H2S (8). 10H2O (1 1) sodium bicarbonate, acidic sodium carbonate: NaHCO3 (also called baking soda) (12) crystal of vitriol, blue vitriol and copper sulfate: CuSO4? 5H2O (13) verdigris, malachite: Cu2(OH)2CO3 (decomposed into three oxides) (14) methanol: CH3OH toxic, blinding, death (15) alcohol, ethanol: C2H5oh (/kloc-0). Acetic acid (16.6℃ glacial acetic acid) CH3COOH(CH3COO- acetate ion) has the commonality of acid (17) ammonia: NH3 (basic gas) (18) ammonia water and ammonia monohydrate: NH3? H2O (a common alkali with universality and no metal ions) (19) sodium nitrite: NaNO2 (industrial salt, toxic).
Second, the color state of common substances
1, white solid: MgO, P2O5, CaO, NaOH, Ca(OH)2, KClO3, KCl, Na2CO3, NaCl and anhydrous CuSO4;; Iron and magnesium are silvery white (mercury is silvery white liquid)
2. Black solid: graphite, carbon powder, iron powder, CuO, MnO2, Fe3O4▲KMnO4 are purple-black.
3. Red solids: Cu, Fe2O3, HgO, red phosphorus ▲ Sulfur: pale yellow ▲ Cu2(OH)2CO3 is green.
4. Color of solution: Any solution containing Cu2+ is blue; Any solution containing Fe2+ is light green; Any solution containing Fe3+ is brown, and other solutions are generally not colorless. (Potassium permanganate solution is purplish red)
5. Precipitation (that is, salt and alkali are insoluble in water): ① Salt: white ↓:CaCO3, BaCO3 (soluble in acid), AgCl, BaSO4 (insoluble in dilute HNO3), etc. ② Alkali: blue: Cu (OH) 2 reddish brown: Fe (OH) 3 white: remaining alkali.
6.( 1) Gases with irritating gases: NH3, SO2 and HCl (all colorless).
(2) Colorless and odorless gases: O2, H2, N2, CO2, CH4 and CO (highly toxic).
▲ Note: Liquid with pungent smell: hydrochloric acid, nitric acid and acetic acid. Alcohol is a liquid with a special gas.
7. Toxic, gas: CO liquid: CH3OH solid: NaNO2 CuSO4 (can be used as a bactericide, mixed with hydrated lime to make a blue viscous substance-Bordeaux liquid).
Third, the solubility of substances.
1, salt solubility
Substances containing potassium, sodium, nitrate and ammonium are all soluble in water.
Only AgCl is insoluble in water, others are soluble in water.
Only BaSO4 is insoluble in water, others are soluble in water.
Only K2CO3, Na2CO3 and (NH4) CO32- are soluble in water, while others are insoluble in water.
2. Solubility of alkali
Alkalis soluble in water include barium hydroxide, potassium hydroxide, calcium hydroxide, sodium hydroxide and ammonia water, while other alkalis are insoluble in water. Fe(OH)3 is red-brown precipitate, Cu(OH)2 is blue precipitate, and other insoluble bases are white. (including Fe(OH)2) Note: AgCl and BaSO4 in sediments are insoluble in dilute nitric acid.
Other precipitates can be dissolved in the acid. Such as: mg (oh) 2co3 baco3 ag2co3, etc.
3. Acids and acidic oxides are mostly soluble in water, while (acidic oxide+water → acid) basic oxides are mostly insoluble in water and partially soluble: barium oxide, potassium oxide, calcium oxide and sodium oxide (basic oxide+water → alkali).
Fourth, chemistry is the most.
1. The most abundant metal element in the earth's crust is aluminum. 2. Oxygen is the most abundant nonmetallic element in the earth's crust.
The most abundant substance in the air is nitrogen. The hardest substance in nature is diamond.
5. The simplest organic matter is methane. 6. The most active metal in the metal activity sequence table is potassium.
7. The oxide with the smallest relative molecular mass is water. The simplest organic compound CH4
8. Under the same conditions, the gas with the lowest density is hydrogen. 9. The most conductive metal is silver.
10, and the atom with the smallest relative atomic mass is hydrogen. 1 1, and the metal with the smallest melting point is mercury.
12, the most abundant element in human body is oxygen. 13, the element that constitutes the most kinds of compounds is carbon.
14, the most widely used metal in daily life is iron. 15, China first used natural gas; The largest coal base in China is: Shanxi Province; The earliest application of copper hydrometallurgy was China (discovered in the Western Han Dynasty [Liu An's "Huainan Wanbi Book" Zeng Qing De Tiehua Copper]] and applied in the Song Dynasty); The earliest discovery of electrons was Thomson of England; Lavoisier, a Frenchman, first came to the conclusion that air is composed of N2 and oxygen.
Five, the "three" in junior high school chemistry
1. The three kinds of particles that make up matter are molecules, atoms and ions.
2. Hydrogen, carbon monoxide and carbon, which are usually used to reduce copper oxide.
3. As a fuel, hydrogen has three advantages: rich resources and high calorific value, and the product after combustion is water that does not pollute the environment. There are generally three kinds of particles that make up atoms: protons, neutrons and electrons. There are only three kinds of ferrous metals: iron, manganese and chromium. 6. Elements that make up a substance can be divided into three categories, namely (1) metallic elements, (2) nonmetallic elements and (3) rare gas elements. 7. There are three kinds of iron oxides, and their chemical formulas are (1)FeO, (2)Fe2O3 and (3) Fe3O4.
8. The characteristic of the solution is three (1) homogeneous; (2) stability; (3) mixture.
9. The chemical equation has three meanings: (1) indicates what substances participate in the reaction and what substances are generated as a result; (2) The particle number ratio of molecules or atoms between reactants and products; (3) Represents the mass ratio of each reactant and product. Chemical equations have two principles: based on objective facts; Follow the law of conservation of mass. 10 pig iron is generally divided into white iron, gray iron and ductile iron.
Carbon steel can be divided into three types: high carbon steel, medium carbon steel and low carbon steel.
12. There are three kinds of iron ore commonly used in ironmaking: (1) hematite (mainly Fe2O3); (2) Magnetite (Fe3O4); (3) siderite (FeCO3). There are mainly three kinds of steelmaking equipment: converter, electric furnace and open hearth furnace.
14. The three reaction conditions that are often related to temperature are ignition, heating and high temperature.
15. There are two ways to change saturated solution into unsaturated solution: (1) heating, (2) adding solvent; There are three methods to change unsaturated solution into saturated solution: cooling, adding solute and evaporating solvent at constant temperature. (Note: For substances whose solubility decreases with temperature, such as calcium hydroxide solution changes from saturated solution to unsaturated solution: cool and add solvent; There are three ways to change unsaturated solution into saturated solution: raising temperature, adding solute and evaporating solvent at constant temperature.
16. There are generally three methods to collect gas: drainage, upward evacuation and downward evacuation.
17, three main causes of water pollution: (1) waste residue, waste gas and waste water in industrial production; (2) Discharging domestic sewage at will; (3) Pesticides and fertilizers used in agricultural production flow into rivers with rainwater.
18, there are three commonly used fire extinguishers: foam extinguisher; Dry powder fire extinguisher; Liquid carbon dioxide fire extinguisher.
19. The change of solubility of solid substances with temperature can be divided into three categories: (1) The solubility of most solid substances increases with the increase of temperature; (2) The solubility of a few substances is little affected by temperature; (3) The solubility of a few substances decreases with the increase of temperature. 20.CO2 can put out fires for three reasons: it can't burn, it can't help combustion, and its density is higher than that of air. 2 1, simple substances can be divided into three categories: metallic simple substances; Non-metallic simple substance; Simple substance of rare gas. 22. The three most important fossil fuels in the world today are coal, oil and natural gas.
23. The three black oxides that should be remembered are copper oxide, manganese dioxide and ferroferric oxide.
24. Hydrogen and carbon have three similar chemical properties: stability at room temperature, flammability and reducibility.
25. There are three times of light blue in the textbook: (1) liquid oxygen is light blue (2) sulfur burns in the air with a weak light blue flame (3) hydrogen burns in the air with a light blue flame.
26. Three blue colors related to copper: (1) copper sulfate crystal; (2) copper hydroxide precipitation; (3) copper sulfate solution. 27. The filtration operation has "triple inclination": (1) The lower end of the funnel is close to the inner wall of the beaker; (2) the end of the glass rod gently leans against the third layer of filter paper; (3) The edge of the beaker containing the liquid to be filtered is close to the glass frame for drainage.
28. Three major gas pollutants: SO2, CO and NO2.
29. The flame of alcohol lamp is divided into three parts: external flame, internal flame and flame core, of which the external flame has the highest temperature.
30. There are three noes in taking and using drugs: (1) Don't touch drugs with your hands; (2) Don't put your nose to the mouth of the container to smell the smell of gas; (3) Do not taste medicine. 3 1. Three ancient chemical processes: papermaking, gunpowder making and porcelain burning. Industrial waste: waste water, waste residue and waste gas.
34. Three kinds of instruments that can be directly heated: test tube, crucible, evaporating dish (and burning spoon).
35. The three atoms explained by the conservation of mass remain the same: the species remains the same, the quantity remains the same, and the mass remains the same.
36. Mixing with air ignites three potentially explosive gases: H2, carbon monoxide and methane (virtually any combustible gas and dust). 37. Three products of coal dry distillation (chemical change): coke, coal tar and coke oven gas.
38. Three characteristics of concentrated sulfuric acid: water absorption, dehydration and strong oxidation.
39. There are three prohibitions on the use of alcohol lamps: burning lamps, burning lamps with alcohol, and blowing mouths.
40. Three steps of solution preparation: calculation, weighing (measurement) and dissolution.
4 1, the first three elements with the most content in biological cells: O, C and H.
42. Three equations in atoms: nuclear charge number = proton number = extranuclear electron number = atomic number.
There are three kinds of particles that make up matter: molecules, atoms and ions.
Chemical formula
1, basic reaction type:
Combinatorial reaction: multivariable-decomposition reaction: multivariable
Displacement reaction: one-to-one displacement reaction: exchange ions
2. Valence of common elements (positive):
Univalent potassium, sodium, hydrogen, silver, bivalent calcium, magnesium, barium and zinc, trivalent metal element aluminum;
157 variable valence chlorine, 245 nitrogen, 46 sulfur, 35 phosphorus, 24 carbon;
One, two copper, two, three iron and two, four, six and seven manganese are special.
3, the steps of making oxygen in the laboratory:
"Tea (stop), tea (bag), tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea, tea,
Check the air tightness of the equipment "package" the medicine and connect the equipment.
The "fixed" test tube is fixed on the "point" of the iron frame, and the alcohol lamp is lit and heated.
"Collect" the collected gas and "leave" the conduit away from the water surface.
Turn off the alcohol lamp and stop heating.
4. Experimental steps of reducing copper oxide with CO:
"One pass, two points, three extinctions, four stops and five treatments"
"One pass" is filled with hydrogen first, and after "two points", the alcohol lamp is lit for heating;
After the "three-stop" experiment is completed, the alcohol lamp should be turned off first, and then the hydrogen gas should be stopped at room temperature after the "four stops". "Five treatments" to control tail gas and prevent carbon monoxide from polluting the environment.
5, the experimental phenomenon of electrolytic water:
"oxygen positive hydrogen negative, oxygen one hydrogen two": the positive electrode releases oxygen and the negative electrode releases hydrogen; The volume ratio of oxygen to hydrogen is 1: 2.
6. Elements that make up the earth's crust: adopted sons (oxygen, silicon, aluminum).
7. Relationship between outermost atoms and ions and valence formation:
"Yang loss is positive, Yin gain is negative, and the value remains unchanged": the outermost layer of atoms loses electrons to form cations, and the valence of elements is positive; The outermost layer of atoms gains electrons to form anions, and the valence of elements is negative; Number of electrons gained or lost = number of charges = valence.
8, chemical experiment basic operation formula:
Solids need spoons or paper slots, one free, two vertical and three elastic; It is best to use a block or tweezers, one horizontal and two vertical.
The liquid should be put in a flask, labeled by hand, and then poured out. The reading should be flat with the section, with the head down low and the head down high.
The dropper drips with a pinch head, and the vertical suspension is pollution-free, uneven and in good position. Don't forget to clean it after use.
The balance of the tray should be flat and the screw should be centered; Put things left and right, and clamp the tweezers first big and then small;
The test paper should be cut down first, and the glass rod is immersed in liquid for the best test effect. Wet the test paper first, stick it on a stick and lean against the air.
The outer flame of the heating wine lamp is two-thirds of the boundary. Sulfuric acid is stirred in water and injected slowly to prevent boiling and splashing.
In the experiment, the air tightness is checked first, and the cups and bottles are heated through the net. After drainage and gas collection, remove the conduit first, and then move the lamp.
9, metal activity sequence:
The order of metal activity from strong to weak is: K Ca Na Mg Al Zn Fe Sn Pb (H) Cu Hg Ag Pt Au (described in turn) K Ca Na Mg Al Zn Fe Sn Pb (hydrogen) Cu Hg Ag Pt Au.
10, "cross method" to write the formula of chemical formula:
"Positive price left negative price right, cross subtraction, write right to test right and wrong."
1 1, filtering operation formula:
The funnel angle of the glass rod and filter paper of the beaker of the bucket frame is the same; Let stand before filtering, don't forget to tilt three times and two times.
12, the law in the experiment:
(1) When solid is heated to produce gas, potassium permanganate oxygen generator (solid-solid heating type) is selected;
The device for preparing O2 from hydrogen peroxide (solid-liquid unheated type) is used to prepare gas by solid-liquid reaction without heating.
(2) When heating the test tube solid, it should be preheated first, and the test tube mouth is slightly inclined downward.
(3) Any generated gas that is insoluble in water (does not react with water) can be collected by drainage.
Any gas with higher density than air can be collected by exhausting upwards.
Any gas whose density is less than air can be collected by downward exhaust.
(4) When doing gas experiment, first check the air tightness of the device, the rubber plug 1-2ml should be exposed on the catheter, and the iron clip should be clamped at the distance from the nozzle 1/3.
⑤ When making gas with a long-necked funnel, the nozzle at the end of the long-necked funnel should be inserted under the liquid surface.
⑥ When igniting combustible gas, you must first check its purity.
⑦ When doing experiments with toxic gases, the tail gas must be finally treated.
⑧ When reducing metal oxides with reducing gas, "one pass, two points, three extinguishes and four stops" must be achieved.
13, reaction law: displacement reaction:
(1) Elemental metal+acid → salt+hydrogen
(2) simple metal+salt (solution) → another metal+another salt
(3) metal oxide+charcoal or hydrogen → metal+carbon dioxide or water
Double decomposition reaction:
① Alkaline oxide+acid → salt ++H2O ② Alkali+acid → salt +H2O
③ Acid+salt → new salt+new acid ④ salt 1+ salt 2→ new salt 1+ new salt 2.
⑤ salt+alkali → new salt+new alkali
14, metal+acid → salt+++H2↑ =
(1) metal reacts with enough acid to release hydrogen in the order of Al > Mg > Fe > Zn.
② Different acids with equal mass react with enough metals, and the smaller the relative molecular weight of the acid, the more hydrogen is released.
③ The same acid with the same mass reacts with enough different metals to release the same amount of hydrogen.
(4) After the reaction of metal+acid → salt +H2 ↑, the solution becomes heavier and the metal becomes lighter.
Metal+salt solution → new metal+new salt:
① When the relative atomic mass of the metal is greater than that of the new metal, the mass of the solution becomes heavier and the metal becomes lighter after the reaction.
② When the relative atomic mass of the metal is less than that of the new metal, the mass of the solution becomes lighter and the metal becomes heavier after the reaction.
15, catalyst: one change and two unchanged (a substance whose chemical properties and quality are unchanged by changing the reaction rate of a substance is a catalyst).
Oxidant and reductant: oxygen is reduced and deprived (the substance that takes oxygen is reductant, and the substance that loses oxygen is oxidant).
16. Impurity removal connector of gas washing cylinder: long inlet and short outlet.
Connection between drainage and gas collection and washing tank: short in and long out.
Connection between exhaust gas gathering and gas washing cylinder: low density means short inlet and outlet, while high density means long inlet and outlet.
17, experimental impurity removal principle: remove other things first, and then remove water vapor.
Experimental inspection principle: water first, then water.
Common common names or nicknames of junior middle school chemistry
Kaolin: Al2O3? 2SiO2? 2H2O
Barite: barium sulfate
Calcium carbide: CaC2
Bleaching powder: calcium (ClO)2+ calcium chloride
Fluorite: CaF2
Quicklime: CaO
Hydrated lime, limewater and hydrated lime: calcium hydroxide.
Gypsum: calcium sulfate ·2h2o
Gypsum burning, plaster of Paris: 2CaSO4? H2O
Dry ice: solid carbon dioxide
Copper malachite basic carbonate: Cu2(OH)2CO3
Tinplate: tin plate, tin plate
Candle: C22H46
Hydrogen peroxide: H2O2
Mercury: mercury
Aqua regia: 1 volume concentrated nitric acid +3 volume concentrated hydrochloric acid.
Alum: potassium sulfate? 12H2O
Borax: Na2B4O7? 10H2O
Soda and soda: Na2CO3
Salt: sodium chloride
Baking soda: sodium bicarbonate
Caustic soda: sodium hydroxide
Platinum: platinum
Biogas: methane
Sulfur: sulfur
Carbide gas: C2H2
Alcohol: C2H5OH (structural formula: CH3CH2OH)
Lime acid: C6H5OH
Glycerol: C3H5(OH)3
Formalin: 30%-40% aqueous formaldehyde solution.
Acetic acid: acetic acid
Oxalic acid: Woohoo!
Marble, limestone, calcium carbonate CaCO3
Alumni: FeSO4? 7H2O
Lignin methanol: CH3OH
Glycerol Glycerol C2H5(OH)3
Alkaline lime, sodium hydroxide and mixture of calcium oxide with sodium hydroxide and calcium oxide
Soda, sodium bisulfate Na2S2O3? 5H2O