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Anonymous users2024-02-06All unlikely!
However, as long as it refers to a specific substance and is denoted by its chemical name, it is pure.
Anything else is a mixture.
the color of common substances;
halogen elements; Chlorine; Yellow-green.
Bromine; Amaranth.
Iodine; Purple-black.
Metallic elements; Copper; Red.
Manganese; Black. Gold; Golden.
Except that it's basically silvery-white.
Compound; sodium peroxide; Pale yellow.
Sulfur; Yellow. Potassium permanganate; Purple.
iron hydroxide; Red.
ferrous hydroxide; Green.
black substance; Carbon.
Copper oxide. Copper sulfide.
Silver sulfide. Manganese dioxide.
Most of the sediment is white.
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Anonymous users2024-02-05First, the basic concept:
1. Chemical change: no change in the formation of new substances. Such as: evaporation, volatilization, dissolution, deliquescent, etc.
Physical Change: There is a change in the formation of new matter. Such as: burning, rusting, corruption, weathering, etc.
2. Elemental: a pure substance composed of an element. Such as: H2, O2, C, S, FE, etc.
Compounds: Pure substances composed of many elements. Such as: H2O, CO2, KCLO3, H2SO4, etc.
Oxide: Composed of two elements, one of which is a compound of the element oxygen. Such as: H2O, CO2, SO2, Fe2O3, etc.
Acidic oxides: compounds that react with alkalis to form salts and water. Usually some non-metal oxides, such as: CO2, SO2, SO3, etc.
Basic oxides: oxides that react with acids to form salts and water. Usually some metal oxides, such as: Cuo, MGO, Fe2O3, etc.
Acid: A compound composed of H+, acid ions. Such as: HCl (hydrochloric acid), H2SO4 (sulfuric acid), HNO3 (nitric acid).
Alkali: A compound that is generally composed of metal ions and OH-. Such as: NaOH, Ca(OH)2, Fe(OH)3
Salt: Generally composed of metal ions and acid ions.
There are three types of salts: (1) normal salts, such as: NaCl, Na2CO3, CuSO4 (2) Acid salts, such as: NaHSO4
3) Basic salts, e.g. Cu2(OH)2CO3
3. Molecule: a kind of particle that maintains the chemical properties of a substance.
Atoms: The smallest particles in chemical change.
Ion: An electrically charged atom or cluster of atoms. Common atomic clusters are as follows: oh- (hydroxide), no3- (nitrate),
SO42— (sulfate), CO32— (carbonate), PO43— (phosphate), NH4+ (ammonium).
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Anonymous users2024-02-04Acids: H2SO4 (sulfuric acid), HCl (hydrochloric acid), HNO3 (nitric acid), H2CO3 (carbonic acid).
Alkali: calcium hydroxide, sodium hydroxide, magnesium hydroxide, iron hydroxide and other salts: calcium carbonate, sodium carbonate, silver chloride, barium chloride, ferric chloride, ferrous chloride, calcium chloride, silver nitrate, etc.
Elemental: H2 (hydrogen), O2 (oxygen), N2 (nitrogen), Fe, Cu, K, Ca, Na, Mg, Al, Zn, Xi, Sn, Hg, Ag and all other metals and helium, neon, argon, krypton, xenon, radon and other noble gases.
Metal oxides: MGO, Fe2O3, Fe3O4, Cuo and other non-metal oxides: CO, CO2, SO2, NO, NO2, etc.
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Anonymous users2024-02-03Common elemental substances and compounds are pure, such as water, oxygen, hydrogen, carbon dioxide, and so on.
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Anonymous users2024-02-02Oxygen, nitrogen, potassium chlorate, carbon dioxide ......
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Anonymous users2024-02-01Salts, such as, NaCl, KCL, bases, NaOH, acids, HCl, H2SO4
elemental, H2, O2
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Anonymous users2024-01-31Copper sulfate copper chloride.
Blue (General.)
All those containing copper ions are blue).
Ferrous sulphate. Ferrous chloride.
Light green (generally bivalent iron is light green).
Ferric chloride yellow.
The ferric ions are yellow).
Copper hydroxide Cu(OH)2
Blue precipitate. Iron hydroxide Fe(OH)3
Reddish-brown precipitate.
Ferric oxide (rust).
Brick red, red phosphorus, red sulfur.
Pale yellow ferric tetroxide.
Black manganese dioxide.
Black oxide copper.
Black graphite, toner, iron powder, black copper.
Red potassium permanganate.
Purple purple litmus solution.
Purple barium sulfate.
White precipitate. Silver chloride white precipitate.
Calcium carbonate white precipitate.
Barium carbonate white precipitate.
Magnesium hydroxide. White precipitate.
Other precipitates are generally white and the solution is colorless.
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Anonymous users2024-01-30In the junior high school chemistry exam, there are many types of questions that give colors and characteristics to determine chemical substances, so it is important to master the colors of common substances in junior high school chemistry.
1. Red solid: copper, iron oxide.
2. Green solid: basic copper carbonate.
3. Blue solid: copper hydroxide, copper sulfate crystals.
4. Purple-black solid: potassium permanganate.
5. Light yellow solid: sulfur.
6. Colorless solids: ice, dry ice, diamond.
7. Silver-white solid: silver, iron, magnesium, aluminum, mercury and other metals.
8. Black solid: iron powder, charcoal, copper oxide, manganese dioxide, ferric tetroxide, (carbon black, activated carbon).
9. Reddish-brown solid: iron hydroxide.
10. White solid: sodium chloride, sodium carbonate, sodium hydroxide, calcium hydroxide, calcium carbonate, calcium oxide, copper sulfate, phosphorus pentoxide, magnesium oxide.
1. Purple-red solution: potassium permanganate solution.
2. Purple solution: litmus solution.
3. Yellow solution: solution containing Fe3+ - iron sulfate solution, ferric chloride solution, ferric nitrate solution.
4. Light green solution: solution containing Fe2+ - ferrous sulfate solution.
5. Colorless liquid: water, dilute hydrochloric acid, dilute sulfuric acid, phenolphthalein test solution.
6. Reddish-brown precipitate: iron hydroxide.
1. Red solid: copper, iron oxide.
2. Green solid: basic copper carbonate.
3. Blue solid: copper hydroxide, copper sulfate crystals.
4. Purple-black solid: potassium permanganate.
5. Light yellow solid: sulfur.
6. Colorless solids: ice, dry ice, diamond.
7. Silver-white solid: silver, iron, magnesium, aluminum, mercury and other metals.
8. Black solid: iron powder, charcoal, copper oxide, manganese dioxide, ferric tetroxide, (carbon black, activated carbon).
9. Reddish-brown solid: iron hydroxide.
10. White solid: sodium chloride, sodium carbonate, sodium hydroxide, calcium hydroxide, calcium carbonate, calcium oxide, copper sulfate, phosphorus pentoxide, magnesium oxide.
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