Petroleum cracking and oil saponification are both processes in which polymers form small molecules?

Petroleum cracking is, oil saponification is not, because oil saponification is the process of producing glyceryl stearate from stearic acid and glycerol in oil, stearic acid and glycerol are both small molecules, so it is not.

a. Hydrocarbons and oils with large relative molecular mass in petroleum cracking do not belong to polymer compounds, petroleum cracking is a complex decomposition reaction process in which a macromolecular hydrocarbon becomes a small molecule hydrocarbon under high temperature and oxygen, and the hydrolysis of oil under alkaline conditions becomes a saponification reaction, so a is wrong;

b. The gasification and liquefaction of coal are both chemical changes, and the process of turning coal into gaseous fuel after treatment belongs to the process of chemical change, so B is wrong;

c. The extraction of iodine from kelp is the process of oxidizing iodine ions into iodine element, so it involves redox reactions, so C is correct;

d. The glucose solution belongs to the solution, the diameter of the dispersed particles is less than 1nm, the fog and colored glass belong to the colloid, and the diameter of the dispersed particles is between 1 100nm, so D is wrong;

Therefore, c

c. Petroleum cracking and oil saponification are not processes in which polymers generate small molecules, and a is incorrect; Margarine belongs to the category of fats and fats, b is incorrect; The Liebig combustion method and the copper wire combustion method are both quantitative analysis methods, d is incorrect, and the answer is c.

A polymer is a molecule with a relative molecular mass of tens of thousands or hundreds of thousands, and oil and oil do not belong to polymers, so A is wrong;

b Margarine is oil, hydrolyzed to produce higher fatty acids and glycerol, amino acids can not be obtained, so b is wrong;

c Hydrogen bonding and intermolecular forces are intermolecular forces; Both ionic and covalent bonds are interaction forces between ions and atoms, so c is correct;

d The Liebig combustion method is a quantitative analysis of the elements, so d is wrong Therefore, c

A The main components of oil and oils and fats are not polymers, so oil cracking and oil saponification are not the processes of polymers forming small molecules, so A is wrong;

b When ethylene is prepared with ethanol and concentrated sulfuric acid, the temperature is 170, and the temperature of water bath heating is less than 100, so the temperature of the reaction cannot be controlled by water bath heating, so B is wrong;

c Methane can have a substitution reaction with chlorine, benzene can undergo halogenation reaction, and ethanol and acetic acid can undergo esterification reaction, so c is correct;

d will (NH4

so4、cuso4

The solution was added to the protein solution separately, and all precipitated appeared, the former one was salting out, and the latter one was denaturing, so D was wrong

Therefore, c