1. Untitled by Li Shangyin:
"In spring, silkworms will weave until they die, and the wax torch will turn to ash and let it dry."
There are both melting process in physical change and burning phenomenon in chemical change. The composition of candle is paraffin wax, which belongs to saturated hydrocarbon. Exothermic combustion in air can melt solid paraffin into liquid wax droplets.
2. Wang Anshi's January Day:
"The explosion happened a year ago, and the spring breeze sent it to Tu Su."
This is a typical chemical change. Firecrackers are generally made of sulfur and other substances, which react chemically after being ignited to generate new substances such as sulfur dioxide.
3. Liu Kun's Gift for Lu Chen:
"Why do you want to make all kinds of steel and turn it into a winding element?" In fact, "steelmaking" is a process of continuously removing impurities from pig iron to make it pure.
4. Li Bai's Song of Autumn Pu:
"The fire shines on heaven and earth, and the red star is purple."
This poem also describes the scene of metal smelting at that time.
5. Yu Qian's Ode to Lime in Ming Dynasty:
"One thousand hammer dug out, fire shut.
Don't be afraid of being smashed to pieces, leaving innocence in the world. "
It is not easy to mine limestone, which refers to physical changes. In this poem, "burning" refers to the chemical reaction of calcining limestone to produce calcium oxide and carbon dioxide. Coupled with the words "if leisure", people feel that this is not only burning limestone, but also symbolizes that people with lofty ideals are taking their time and treating it as leisure no matter how severe the test is. "Broken into pieces" embodies the changes of the body and expresses the spirit of not being afraid of sacrifice. Keeping the world innocent is the author's straightforward expression and his determination to be a pure and innocent person.
Yu Qian's other object-chanting poem "Ode to Coal": "Digging chaos will bring black gold, and the most profound sun will be saved. Fire will revive spring, and the red furnace will break the night. Ding yiyuan is generated by strength, and the stone remains after death. I hope that the whole life is full of warmth and I will go out of the mountains tirelessly. " The author focuses on the formation, characteristics, properties and main uses of coal in the whole poem, and with the help of
The above is for reference.
2. Some chemistry preview questions. And add some classical Chinese vocabulary. Name of solution: List common soluble sucrose solution solutes: sucrose solvent: water clarified lime water solute: calcium hydroxide solvent: copper sulfate solution solute: copper sulfate solvent: iodine solvent: alcohol (or alcohol solution) dilute hydrochloric acid solute: hydrogen chloride solvent: water salt solution: sodium chloride solvent: water 1. Check, see clearly and make it clear. 3. you must "believe": let go. 4. The "genus" of loyalty is also: class. 5. Battle between "Neng" and "Tong": Neng, Neng; Therefore, with. 6. War is "please" and "slave": please, please; Follow, follow. 7. Fight "Yu" long spoon: Yes. 8. Gong Jiang "Chi" and "Zhi": Chi, chasing cars; Wisdom, pronoun, here refers to the defeated enemy. The "harmony" of 9 looks at "zhi": harmony, a conjunction, indicates the commitment of action, which has no practical significance; Pronouns refer to the situation of war and the enemy. 10. Then "decline" and "exhaustion": decline, weakness, decline; Tired, tired. 1 1. Therefore, "gram" means: conquest and victory. 12. Fear has a hidden "ambiguity": modal particles, sighing expressions and meaningless.
3. In many ancient poems and idioms, there are some material properties and chemical phenomena, which reflect that (1) beautiful jewels are full of waves in the sand. The separation of gold from sand belongs to the separation of mixtures. The chemical properties of gold are stable and can exist in the form of simple substance, so it is related to the properties of gold. In Liu Changqing's Reward for Zhang Xia, "Underwater Sound Swallows Ice,
(2) A. What it means is that the stone is exposed after the water falls, and no new substance is generated, which is a physical change; B, tempering into steel is to remove excess carbon from pig iron through chemical changes, which belongs to chemical changes; C. Obtaining gold from ore and producing new substances is a chemical change; D. Dropping water into ice means that water changes from liquid to solid, but the state has changed, which is a physical change; E. Dropping through a stone is a physical change in which the stone is washed out of the hole by dripping for a long time, and no new substance is generated; What F does is a change in shape, and no new substance is produced. This is a physical change.
So, the answer is: (1) gold; Water; Molecules are constantly moving; (2) BC.