Regarding the purchase of natural extracts and echemi chemical

 Blue solid basic copper carbonate (patina) : green solid Black solid: carbon powder, copper oxide, manganese dioxide, iron tetroxide White solid: anhydrous copper sulfate (CuSO4), potassium chlorate, potassium chloride, magnesium oxide, sodium chloride, calcium carbonate, sodium carbonate, zinc sulfate Purple black: potassium permanganate light green solution: 

Ferrous sulfate (FeSO4) 32, to make combustibles burning conditions: combustibles in contact with oxygen, to make the temperature of the combustibles reach the ignition point. 33, gases composed of diatomic molecules: H2, O2, N2, Cl2, F2 34, the following is determined by which part of the atomic structure: 

(1) The type of element is determined by the number of protons, (2) the classification of the element is determined by the number of outermost electrons, (3) the chemical properties of the element are determined by the number of outermost electrons, (4) the valence of the element is determined by the number of outermost electrons, (5) the relative atomic weight is determined by the number of protons + neutrons. 

35, learned organic compounds: CH4 (methane), C2H5OH (alcohol, ethanol), CH3OH (methanol), CH3COOH (acetic acid, acetic acid) 36, from the macro and micro understanding of the mass conservation law can be summarized into five unchanged, two must change, one may change: (1) five do not change: From the macroscopic view, the types of elements and the total mass of reactants and products are unchanged, and from the microscopic view, the atomic mass, types and number of atoms are unchanged. (2) Two certain changes: the macroscopic view of the material type must change, from the microscopic view of the molecular type must change; (3) One possible change: the sum of the molecules may change

(June 20) 1. Why energy-saving lamps save energy? The traditional incandescent lamp principle is to heat the tungsten wire, and the tungsten wire shines after overheating, so a lot of energy is wasted in the heating process of the lamp, so the incandescent bulb is hot after a long time. Energy-saving lamps work on the principle of excitation of fluorescent substances to emit light, and the energy loss is small, so it is energy-saving. 

2. Why do different echemi chemical liquids have different densities? The molecules that make up different liquids are different, which means that the mass and size of the molecules that make up the substance are different, and the spacing of the molecules that make up the substance is different, so the mass of the same volume of the substance is not the same, which is the density is not the same. 3. What is the lanthanide actinide series? 

In the sixth period of the periodic table, there are not 18 elements, there are 32, in order to make the periodic table more beautiful and compact, 15 elements are written in a grid, and the properties of these 15 elements are also very similar, called lanthanide actinides. 4. People get tanned. Why? 

There are melanocytes in the human body, which is why the human hair can grow black, in the sun's irradiation, these melanocytes will be activated, forming melanin, and slowly accumulate on the epidermal cells will become black. 5. Who was the founder of chemistry? Chemistry is developed step by step in the development of society, from Lavoisier discovered the composition of the air began, chemistry began to slowly separate from medicine, to the 18th century, a German professor of pharmacology Starr wrote "Chemical basis", chemistry has developed into a discipline, and now, chemistry has derived a lot of branches of science, such as organic chemistry, inorganic chemistry. Analytical chemistry, etc., and even finer.