When I went to university in Australia, was it better to study the structure of matter or organic ch

Organic chemistry is more practical, but it depends on your interests and hobbies.

Organic chemistry. In fact, it really doesn't matter what you pay attention to, long live the interest.

There are laws in organic chemistry, which requires understanding the law of bond breaking of substances in various reactions, remembering some typical reactions, grasping characteristic reactions, and expanding them appropriately. The basic properties of matter must be remembered.

One word: back, only back, high school organic, if it's not a competition, there is no way to understand the mechanism.

1.Increase your interest in learning chemistry, and if you are not interested, you will not be able to learn anything.

2.If you don't get good grades, you should find a cram school in time, preferably a small class.

3.Master the organic essentials, such as the quadrivalent key of C, and then go to the sea tactics.

The amount of matter, and therefore the amount of c atomic matter, contains on average per each of the mixed gases;

The amount of aqueous matter n = m m m = and therefore the amount of h atomic matter contains on average per mu of mixed gas;

Therefore, the average molecular composition of the gas mixture is such that the c number of the two gases must be on both sides, and the h number must be on both sides of 4 (or both).

The gaseous hydrocarbons with less carbon number are only methane, so the gas mixture must contain CH4

And the h number of methane happens to be 4, so the h number of another gas must also be 4, there can be no ethane, it may be ethylene, butyne, etc.

If the average molecular composition of the gas mixture is CXHY, the general formula [conditional ignition] is completely combusted

cxhy+(x+

Because it is a closed container (in fact, it should be a sealed container with constant volume), and the pressure does not change before and after the reaction, it means that the amount of total gas substances does not change; And 120 The water is also gaseous, then.

1+x+, the solution is y=4 [this conclusion can be remembered, that is, the volume of gas with an average h number of 4 is unchanged before and after complete combustion above 100].

Therefore, as long as the average h number of the gas mixture can reach 4, it is sufficient. See Question 1 for specific analysis.

If the sum of the two substances remains the same, the oxygen consumption of the two substances will not change during complete combustion, which means that the oxygen consumption of the two substances of the same amount is also the same.

In A, ethanol C2H6O can be regarded as C2H4·H2O, and the subsequent H2O is non-oxygen-depleting, so it is the same as ethylene;

In B, methyl formate C2H4O2 can be regarded as CH4·CO2, and the latter CO2 is non-oxygen-depleting, so it is the same as methane;

In C, the oxygen consumption of benzene C6H6 should be three times that of acetylene, which is of course more different from ethylene.

In D, C2H4O2 acetic acid is similar to B.

I'll start with a supplement].

The third question is a simple way to determine the oxygen consumption of organic matter and its oxygenated derivatives for combustion, namely:

Organic matter cxhyoz can be written as cahb·mco2·nh2o [writing: as long as the atom is conserved, simply put, 1 o atom proposes 2 h, or 2 o atoms propose a c], the following CO2 and H2O are non-oxygen depleting parts, so cxhyoz is the same as the amount of CAHB oxygen consumption of equal substances.

For example, acrylic acid CH2 = CH-COOH, the molecular formula C3H4O2 can be regarded as C2H4·CO2, so the amount of acrylic acid of the same substance is the same as the oxygen consumption of ethylene; Of course, it can also be written as C3·2H2O, which is the same as the oxygen consumption of 3 C atoms. The methyl formate in option b above can also be regarded as C2·2H2O, which is the same as the oxygen consumption of 2 C atoms.

1.According to the conservation of the mass of the element, the product after the combustion of the substance is known to contain c h, so c:h=1:4, so a is chosen

2.When the temperature is greater than 100 degrees Celsius, there is no change in the pressure in the front and rear containers, so the volume of the gas does not change, that is, the volume change is 0, and the original hydrocarbon organic compounds are set to cxhy, then there must be y=4 so choose a

The amount of 3 substances remains unchanged, the oxygen consumption is the same, so the simplest formula of the mixture is the same, because the ethanol chemical formula can be regarded as ethylene + water, so it is the same as the ethylene chemical formula, choose A

The last question of chemistry is not written out, and it is not easy to understand.

The list summarizes the types of reactions that can occur for each functional group such as:

Alcohols can undergo catalytic oxidation reactions The corresponding equation is:

The corresponding equation for the esterification reaction is :

The equation corresponding to the reaction with the Na element is:

The elimination reaction that occurs when heated at 170 degrees Celsius.

The substitution reaction that occurs with HBR under heated conditions is:

After listing it all, analyze the location of the broken bonds of each reaction, do not memorize, understand why it breaks the bonds this way, what is the phenomenon, such as purple and white precipitates (tribromophenol).

In this way, you can not only memorize the equations in the textbook, but also understand the properties of matter in terms of properties, encounter unlearned substances, and also know what reactions it can take in the properties of functional groups.

When you know a lot about the properties of matter, you can go back to the textbook and look at the details of the experiments, the methods of preparing matter.

And finally, look at the text parts of the book that you don't read, because most of you usually pay attention to equations and diagrams, and you just don't look at the text descriptions.

Textual descriptions are technical terms that help to improve the answer when you ask a question.

Chemistry is the most memorized in science, and most of the properties of substances in organic matter, reaction types, phenomena, etc. need to be memorized, but not all, some reaction mechanisms need to be analyzed. In short, do a good job in each question, reflect and summarize carefully, and there is no need to worry.

Don't memorize, be flexible

There are many and fragmented knowledge points in chemistry, it is not easy to learn well, and there are many relationships between substances. The regularity of organic chemistry is stronger than that of inorganic chemistry, and inorganic chemicals have more characteristics, while organic chemistry generally has strong regularity!

But in general, there is almost no perfect score in chemistry in the college entrance examination every year, and the full score in physics should often be visible, so it is really not easy to get a high score in chemistry, of course, if you are a chemistry lover like me, it should not be difficult to learn, I wish you success!

The chemical equation is the most basic and must be memorized. The basic elements should be clarified, and it is best to be very precise.

It's really good for you to do this, in fact, as long as you want to learn, you will definitely be able to, organic chemistry, starting for alkanes, olefins, alkynes, benzene and their homologues, these contents you will grasp a typical, in the promotion, on the line. Remember the laws of physical properties and the characteristics of chemical properties. Again, it is the type of reaction, that is, substitution, elimination, addition, etc., the conditions and laws of the reaction, and organic synthesis, focusing on the method can be, I wish you ...... learning progress

I've always shared one view.

I just look for it in the book.

It's you who take out your textbooks and supporting materials.

Then take out a notebook.

In the book and the information leaf by leaf, as long as the knowledge points are written down, and then the same are deleted, the rest is to summarize the key points, so that I read and write again, the effect is better.

Organic chemistry is actually very systematic, you only need to remember the chemical properties of each functional group, and the rest of the things are not difficult.

Do more questions....The key is to be proficient and learn to draw inferences. Ask the teacher more questions about electricity, and the teacher will naturally like you. The reason why China's education has failed so much is because good students are good learners in the eyes of teachers.

As long as you study well, the teacher will like you, even if the current style of life has not changed...Huh....I hope that China will have another talent.

My experience.

Back reactive. It's better to memorize it than the ninety-nine table, and that's it.

Let me introduce you to my experience, in fact, chemistry is not difficult to learn, the foundation must be laid in the first year of high school, whether it is theoretical chemistry or elemental chemistry, you must do a good job of pre-class preview, and then the main work after class is to look at the knowledge you don't understand before class, equations should be written often, practice makes perfect.

Organic chemistry and inorganic chemistry are different, what you have to do is to memorize the properties of the major types of substances and what reactions occur, so that you will be very proficient in organic inference, it is essential to do inference, just do one or two questions a day, organic questions are very flexible, and it is relatively difficult to involve a lot of isomers, so it is very important to understand the properties of substances, those substances in organic chemistry are very representative, for example, the representative substance of aromatic hydrocarbons is benzene, then you have to understand the properties of benzene thoroughly, Keep in mind the reactions that occur so that you can draw inferences.

Chemistry is like that, you have to learn those representative substances well.

Science: Elective 3: Structure and Properties of Matter (Difficult).

Elective 4 Principles of Chemical Reaction and Elective 5 Organic Chemistry Fundamentals Say Yes Choose One of 2, in fact, you have to learn, the college entrance examination will have two parts are organic and principle, which can be selected when you do it, so the school generally chooses to learn both.

Liberal Arts only takes electives 1 and 2

Organic chemistry on the basis of understanding the proper memory of good, organic mainly alkanes, olefins, alkynes, benzene, aldehydes, ketones, acids, esters and other composition, before learning to understand their molecular formula, what are the chemical properties, composition, and then learn how they reflect, mainly the process of chemical equation formation, with these foundations, organic is very easy to learn, of course, these as long as you do more exercises can do common.

Focus on the following relationships:

1.Relationship between organic matter types and functional groups, 2The relationship between functional groups and the type of reaction.

3.The relationship between the type of reaction and the conditions of the reaction.

4.The relationship between the mutual transformation of various types of organic matter.

The first chapter is the basics, in which the structure and nomenclature of organic matter are more important. Clause.

Chapters 2 and 3 are the focus of the book, first remembering the properties of the relatively simple substances and the reactions that can occur in the examples in the book, and then remembering the properties of that type of matter according to the similarity of the properties of the same functional groups. Clause.

Chapters 4 and 5 have a lot to understand, just remember some important knowledge points.

The foundation of organic chemistry is an elective, and the score of the college entrance examination is up to 20 points, and the 20-point question must come out with the inference question of organic synthesis if you want to comprehensively examine your basic machine, so it is recommended to do more organic inference exercises.

Rather than asking people online, I think it's better to buy basic tutoring and ask yourself about a senior teacher.

1cda.The outermost shell of carbon in methyl group (-ch3) has four electrons and forms three covalent bonds with three other hydrogen atoms – 6 electrons and one unbonded electron for a total of 7 electrons bCarbocation [C(CH3)3] The first carbon atom forms three covalent bonds with the other three carbon atoms – 6 electrons, and loses one unbonded electron, for a total of 6 electrons outside the nucleus.

c.The outermost four electrons of the carboanion (CH2CH3) (the first carbon atom) form a common electron pair with carbon, and two common electron pairs with two hydrogen, and one electron is obtained, for a total of 8 dCarbonate.

There are two C-O single bonds between carbon and oxygen in d, one c=o, and there are four common electron pairs, so the carbon satisfies the 8-electron structure.

Question 2 b is methane; Ethane; neopentane (2,2-dimethylpropane); 2,2,3,3-Tetramethylbutane.

The difference between 3c is a methylene group (-ch2-).

Each carbon atom of an alkane is sp3 hybridized.

Question 1 c: Because the carboxanion is obviously negative 1 valence, one more electron with 2 H and one ch3 to form exactly four shared electron pairs of 8 electrons.

Question 2 b is methane and ethane respectively. Pentane. Octane.

3. The question is not very clear, I didn't learn the structure of matter, hehe.

1cd c is not to mention there are two double bonds between carbon and oxygen in d, and there are four electrons that are common, so carbon satisfies 8 electrons.

Question 2 b is methane and ethane respectively. Pentane!!! n-octane !!

The difference between 3c is that each carbon atom of a methylene (-ch2-) alkane is sp3 hybridized.

Sell the distillation. Because the boiling point of each organic hydrocarbon in coal tar is different, as long as the temperature is maintained before benzene boils, impurities will be removed during boiling. Then it rises above the boiling point and the benzene vapor will precipitate. Then just cool down and pull.