First of all, you should pay attention to ventilation when taking a bath with a gas water heater, and don't take a bath in a completely closed room, because it will produce toxic gas of carbon monoxide; The second is that the concentration of medical alcohol we use is 75%; Third, when it rains, it will produce acid rain, because some toxic gases produced by industry can be dissolved in water; The fourth is that the main components of liquefied petroleum gas are propane and butane.
Fifth, the main component of natural gas is methane; Sixth, the gold content of 24K pure gold is above 99%; Seventh, smoking can cause various changes in the lungs, and the main toxic component is nicotine.
Eighth, if you want to store edible oil for a long time, it is best to use glass or ceramics; Ninth, the original works of ancient calligraphers can be well preserved until now because of the stability of carbon; The tenth is that the starting gun of the school sports meeting will have smoke, and the main component is phosphorus pentoxide.
Chemistry is a natural science based on experiments. Mendeleev's periodic table of chemical elements greatly promoted the development of chemistry. Nowadays, many people call chemistry "central science" because chemistry is the core of some scientific disciplines, such as materials science, nanotechnology, biochemistry and so on.
Chemistry is a natural science that studies the composition, structure, properties and changing laws of substances at the atomic level, which is also the core basis of chemical changes.
There are five and two disciplines in modern chemistry: inorganic chemistry, organic chemistry, physical chemistry, analytical chemistry and polymer chemistry.