How to answer the chemistry experiment questions in the third year of junior high school? What terms

You can write in the mode of the experiment report.

1) Experiment serial number and title.

2) Author 3) Purpose and principle of the experiment It is necessary to be as concise and clear as possible.

4) The test subject should be indicated.

5) Experimental materials generally do not need to be described in detail (if the same as the experimental guidance, you can mark "omitted" after this question).

6) Experimental procedures and observation items.

7) Experimental results Write down the processed results and attach the original data (including the recorded graphs).

8) Discussion Evidence-based scientific analysis of experimental results should be realistic and logical, rather than using ready-made theories to give a general explanation of experimental results. On the basis of analyzing the experimental results, several summaries or conclusions with common laws are derived. The conclusion should be well-founded and echo the purpose of the experiment, and what cannot be verified by the experiment should not be included in the conclusion.

If the results do not achieve the expected purpose, or even abnormal phenomena, the possible causes should be analyzed and considered. If you need to refer to extracurricular reading materials, you should indicate the source. The discussion part should be written seriously, and should not blindly plagiarize books or other people's experimental reports.

9) Conclusion.

With reaction, generated

Produces gases.

Precipitation occurs.

The solution appears cloudy and changes color.

The phenomenon needs to be clarified.

Nothing, mostly equations, and the properties of some chemicals!

You can go to the subject network to have a look!

The operation of chemical experiments and the correctness and error of the instrument should be mandatory, multiple-choice questions.

Experimental topics most often appear in laboratory gas systems, generating and collecting devices, chemical equations, and so on.

The most difficult is the chemistry question.

You can see it, I hope it will be helpful to you.

Chemistry experiments that must be mastered:

1..Properties of oxygen: Wood strips rekindle in oxygen, sulfur burns in oxygen, charcoal burns in air and oxygen, and wire burns in air and oxygen.

2.Oxygen production: hydrogen peroxide decomposition, heating KCLO3, heating KMno4

3.Composition of water: point hydrolysis water.

4.Movement of molecules.

5.Purified water, distinguish between hard water and soft water.

6.Law of Conservation of Mass: Combustion of white phosphorus, reaction of iron and copper sulfate solution, reaction of sodium carbonate powder with hydrochloric acid, combustion of magnesium strips, reduction of copper oxide by hydrogen.

7.Carbon and carbon oxides: reduction of copper oxide by charcoal, reaction of marble and dilute hydrochloric acid, stepped candle experiment, test of carbon dioxide, solubility experiment of carbon dioxide, reaction of carbon dioxide with water.

9.Fuels and their utilization: conditions of combustion, combustion of white phosphorus under water, reaction of magnesium bars with hydrochloric acid.

10.Hydrogen: Zn + H2SO4 = ZnSO4 + H2 (hydrogen is collected by the drainage method and hydrogen is collected by the downward exhaust air method), Zn + 2HCl = ZnCl2 + H2

This is just an experiment that must be mastered in the first semester of the third year of junior high school, and I don't know if I haven't learned it in the second semester of the third semester.

There are the following key experiments, it is too laborious to write all the steps and whatever, give you the name of the experiment, and you can find the experiment.

1。Produce carbon dioxide, oxygen, hydrogen (be sure to check purity)2. Prepare a solution with a certain mass fraction (note the calculation).

3。Carbon or carbon monoxide reduced copper oxide, and industrial ironmaking, as well as hydrocopper smelting (industrial ironmaking, the 4 equations for carbon in blast furnaces are important.

4。That's all for industrial impurity removal (that is, turning impurities into precipitates or gases and separating them from the stock solution!!

Mainly reduced metal oxides.

I've taken the test, and I probably only remember a little bit.

1.To test the use of medicine, sand and small stones are used instead.

2.The nature of CO2 is examined, and the grade is made first and then collected;

3.by the order of activity of metals;

4.Distillation (it seems that there is, it's been a few years).

5.stratification of liquids;

6.Exothermic and endothermic of drugs dissolved in water;

7.The acidity and alkalinity of the solution are tested, and the pH is used to try to make it;

That's probably all for the test, and I can't remember some of them.

Reaction of cor sulfuric acid and some metals.

Oxygen is produced. Hydrogen production.