Examples are given to illustrate the effect of temperature on the rate of chemical reaction

Examples are given to illustrate the effect of temperature on the rate of chemical reaction

Physical changes: (1) water turns into ice and water turns into steam; (2) gasoline gasifies, ignites and explodes and pushes the piston; (3) writes on the blackboard with chalk; (4) breaks the glass; (5) the moon turns to the other side of the earth; (6) the electric fan turns on; (7) the light turns on; (8) playing mahjong; (9) buying things with money; (10) taking a car from a to B
Chemical changes: (1) food digested by stomach acid (2) smoking cigarettes (3) lighters burning (3) Chinese New Year Fireworks (4) kerosene lamp (5) food spoilage (6) liquefied petroleum gas lighting (7) 84 washing fruit surface sterilization (8) super strong range hood detergent washing range hood (9) organic fertilizer retting (10) soap decontamination
The above are all physical and chemical changes in daily life, also known as physical and chemical reactions
White precipitates are formed when bleach in water meets air
Put sodium bicarbonate in the hair to neutralize the acidity
Ice melts into water at room temperature
Then forget to offer three
In fact, a lot of them are around us
Example 1: the rust of steel belongs to electrochemical corrosion
The equation is: negative electrode: 2fe-4e = 2Fe + positive electrode: 2H2O + O2 + 4E = 4OH-
Example 2: bleaching powder can be bleached because the carbon dioxide in the air reacts with the main components in the bleaching powder, and the hypochlorite generated has strong oxidation
Example 3: we usually use hydrochloric acid or acetic acid to remove the scale in the kettle because they can reflect with calcium carbonate, the main component of the scale, and emit carbon dioxide
Example 4: the main raw materials of rocket are liquid hydrogen and liquid oxygen, because they can release a lot of energy without polluting the environment
Example 5: we use this reaction to make wine: glucose can be decomposed into alcohol and carbon dioxide in the absence of oxygen
Chemical reaction: iron forms ferric oxide (rust) in the presence of oxygen and water
Carbon burns in oxygen to produce carbon dioxide
Food spoilage
carbon monoxide poisoning
Using a lighter
Physical change: ice melting
Cold water to hot water
Wooden tables, chairs and benches
Conversion of electric energy into heat energy (use of induction cooker)
Chemistry:
1. Candle burns to produce carbon dioxide and water. 2. Phosphorus and oxygen burns to produce phosphorus pentoxide. 3. Rust. 4. Carbon dioxide will make clear limewater turbid. 5. Gunpowder