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Anonymous users2024-02-06Two concepts, ionic compounds.
It means that the composition of the compound is composed of two ions, i.e., anionic and cationic, for example, NaCl is an ionic compound, which is different from covalent compounds.
Ionic crystal is another concept, which refers to the crystallization of ionic compounds, such as solid NaCl is a kind of ionic crystal, which is different from atomic crystals and molecular crystals.
In the case of NaCl, it is an ionic compound in both liquid and solid state, but it is only an ionic crystal in the solid state, so the ionic compound is not necessarily an ionic crystal, depending on its form of existence; Ionic crystals must be ionic compounds.
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Anonymous users2024-02-05In the case of NaCl, it is an ionic compound when it is solid, which refers to the two concepts of crystals crystallized from ionic compounds; An ionic crystal must be an ionic compound, a concept that distinguishes it from atomic crystals and molecular crystals, which are in a liquid state.
Ionic crystal is another concept, depending on its form of existence, so ionic compounds are not necessarily ionic crystals, ionic compounds refer to the composition of compounds composed of two ions, yin and yang, this concept is different from covalent compounds, but only in the solid state is ionic crystals, such as solid NaCl is an ionic crystal, such as NaCl is an ionic compound.
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Anonymous users2024-02-04An ionic crystal must be an ionic compound, whereas an ionic compound is not necessarily an ionic crystal.
Crystals must be solid, and some ionic compounds do not have a solid form, so it cannot be said that ionic compounds are ionic crystals.
Remember.
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Anonymous users2024-02-03Ionic compounds are ionic crystals, covalent compounds are generally molecular crystals, and only a very small number of covalent compounds are atomic crystals, such as silicon dioxide.
Silicon nitride and other ionic compounds are not necessarily all ionic crystals, such as Na2SO4*10H2O, the crystals of this substance will turn into sodium sulfate when heated.
The solution is because the sulfate ions and sodium ions are in the water molecules.
In the "blighted finger cage" concluded by hydrogen bonds, the hydrogen bonds are broken by heating.
Hope it helps you if you don't have a pairing!
If you don't understand, please ask! Hope!
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Anonymous users2024-02-021. Differences in meaning.
Molecular crystals are crystals between molecules that are formed by intermolecular forces, including van der Waals forces and hydrogen bonds.
Atomic crystals are crystals with a spatial network structure formed by strong covalent bonds between adjacent atoms only by strong covalent bonds.
Ionic crystals refer to crystals formed by ionic compounds, which belong to a special form of ionic compounds and cannot be called molecules.
2. Differences in nature.
Molecular crystals do not conduct electricity in both the solid state and the molten state; Its solubility adheres to the principle of "similar dissolution". Polar molecules are soluble in polar solvents, and non-polar molecules are soluble in non-polar organic solvents; The intermolecular force is very weak, the molecular crystal has a low melting point, boiling point, small hardness, volatile, and many substances are gaseous or liquid at room temperature.
Atomic crystals generally have a high melting point, boiling point and hardness, and are generally not conductive and are also poor conductors of heat. It does not conduct electricity when melted, but semiconductor silicon and other products can conduct electricity conditionally. It is not soluble in any solvent and is chemically stable.
The ion crystal is electrically neutral as a whole, which determines that the absolute value of the sum of the charge charge of various positive ions in the crystal is equivalent to the sum of the charge charge of the negative ions, and leads to an important constraint relationship between the structural factors such as the composition ratio and the price ratio of the positive and negative ions in the crystal.
3. Differences in crystal structure.
Molecular crystals are tightly packed, such as 1 molecule of van der Waals force of dry ice is immediately surrounded by 12 molecules, and van der Waals force of ice, hydrogen bond 1 molecule is immediately surrounded by 4 molecules.
Atomic crystals are spatial three-dimensional network structures, such as diamond, crystalline silicon, silicon dioxide, etc. All atoms are connected to each other by covalent bonds only.
The ionic crystal is symmetrical, and the symmetry plane and center of symmetry can be found in the crystal. The unit cell is the representative of the crystal, which is the smallest unit in the crystal, and the unit cell is juxtaposed without gaps to obtain the crystal.
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Anonymous users2024-02-01Ionic compounds refer to the composition of compounds composed of both anion and cation, for example, NaCl is ionic compounds, which is different from covalent compounds.
Ionic crystals refer to crystals formed by ionic compounds, such as solid NaCl is a kind of ionic crystal, which is different from atomic crystals and molecular crystals.
In fact, ionic crystals belong to ionic compounds, which are a special form of ionic compounds, and their common feature is that they are all composed of ionic bonds, and only ionic compounds with several basic characteristics of crystals (such as long-range ordering) can be called ionic crystals.
Since the columbic sub-compounds do not necessarily exist in a crystalline state, the ionic crystals are definitely ionic compounds, and the ionic compounds are not necessarily ionic crystals.
In the case of NaCl, it is an ionic compound in both liquid and solid state, but it is only an ionic crystal in the solid state, so the ionic compound is not necessarily an ionic crystal, depending on its form of existence; Ionic crystals must be ionic compounds.
Crystals are solids in which the internal particles are repeatedly arranged in three-dimensional space.
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Anonymous users2024-01-311. Ammonium salts, such as NH4Cl, NH4NO3, (NH4)2CO3, etc.;
2. Strong alkalis, such as KOH, NAOH, etc.;
3. "A certain acid"."a certain acid hydrogen some", such as K2SO4, NaHCO3;
4. Peroxides, such as Na2O2, superoxides, such as Ko2.
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Anonymous users2024-01-301. Ammonium salts, such as NH4Cl, NH4NO3, (NH4)2CO3, etc.;
2. Strong alkalis, such as KOH, NAOH, etc.;
3. "A certain acid"."a certain acid hydrogen some", such as K2SO4, NaHCO3;
4. Peroxides, such as Na2O2, superoxides, such as Ko2.
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Anonymous users2024-01-291. Ammonium salts, such as NH4Cl, NH4NO3, (NH4)2CO3, etc.;
2. Strong alkalis, such as KOH, NAOH, etc.;
3. "A certain acid"."a certain acid hydrogen some", such as K2SO4, NaHCO3;
4. Peroxides, such as Na2O2, superoxides, such as Ko2.
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Anonymous users2024-01-281. Crystals are mainly divided into ionic crystals, molecular crystals, metal crystals and atomic crystals. Ionic crystals refer to crystals formed by ionic compounds, and ionic crystals belong to a special form of ionic compounds, which are not called molecules. The crystals formed by positive and negative ions or groups of positive and negative ions combined by ion bonds in a certain proportion are called ionic crystals.
2. Strong alkalis, active metal oxides and most salts are ionic crystals. Ionic crystals are generally hard and brittle, have a high melting and boiling point, and can conduct electricity when melted or dissolved. (Note: Different from ionic compounds.) Mori rent.
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