英语牛逼的大大帮帮忙总结下（缩写）这2个短文哈!read the following passages and summarise each one of them:PASSAGE1:An ionic compound is a collection of an equal number of positive and negative ions arranged in a threedimensional

英语牛逼的大大帮帮忙总结下（缩写）这2个短文哈!read the following passages and summarise each one of them:PASSAGE1:An ionic compound is a collection of an equal number of positive and negative ions arranged in a threedimensional
英语牛逼的大大帮帮忙总结下（缩写）这2个短文哈!
read the following passages and summarise each one of them:
PASSAGE1:
An ionic compound is a collection of an equal number of positive and negative ions arranged in a threedimensional lattice.Ionic compounds can be dissociated into their constituntions with little effort.Further,they can be electrolysed to produce elements of constitunent atoms.water also weakens the attraction between the ions in an ionic compound.Yhis is why many ionic compounds dissolve well in water.Moreover,ionic compounds can conduct electrecity.Most ionic compounds are made of metals.
In comparison,covalent bonds have quite different properties.They do not ionise or conduct electricity.Electrolysis of covalent bonds is,thus,not possible.Many covalent bounds are not soluble in water.Covalent bonds dissolve much easier in organic liquids.Since the bounding here is by electron sharing and not by electron attraction,the number of atoms in covalent molecules is not indefinitely large.They have lower melting and boiling points than ionic compounds.Many covalent molecules are in the gas phase or liquid state (CL2,H2O).
PASSAGE2:
Hydrocarbons are compounds of carbon and hydrogen.The unique property of carbon atoms to from long chains results in the possibility of a large number of hydrocarbons being formed.The natural source of hydrocarbons is petroleum(crude oil),which is preserved by nature in some reservoirs of porousrocks in the earth.Petroleum is withdrawn from such reservoirs through wells driven in them by puncturing the cap of protective impervious rocks that prevented it from seeping away.
The simplest hydrocarbon is methane.The simplicity of methane is clear from the fact that a molecule of methane has four hydrogen atoms linked to one central atom of carbon.This is simply expressed by its molecular formula CH4.
The carbon atom has four electrons in its outermost orbit.However,quantum laws allow it to have another four to complete the set,which means that the valency of carbon is 4 (tetravalent).The carbon atom,therefpre,froms a chemical bound with 4 atoms of hydrogen by sharing an electron with each of them.The valency of hydrogen is 1 (monovalent)and each of the four hydrogen atoms also shares an electron with thecarbon atom.A methane molecule thus formed by 4 hydrogen atoms surrounding a carbon atom in a chemical bond males for a very stable arrangement.

英语牛逼的大大帮帮忙总结下（缩写）这2个短文哈!read the following passages and summarise each one of them:PASSAGE1:An ionic compound is a collection of an equal number of positive and negative ions arranged in a threedimensional
第一题讲离子化合物和共价键的不同构造和性质,但重点在于性质,所以可以直接概括他们的不同性质.
Ionic compounds,most of which made of metals,dissolve well in water and usally can conduct electrecity,while covalent bonds have lower melting and boiling points than ionic compounds.Many covalent molecules are in the gas phase or liquid state.
第二题主要讲碳水化合物,它的自然来源是石油；重点讲了甲烷的结构.
Hydrocarbons are compounds of carbon and hydrogen,the natural source of hydrocarbons is petroleum and the simplest hydrocarbon is methane;
A methane molecule is formed by 4 hydrogen atoms surrounding a carbon atom in a chemical bond males for a very stable arrangement.

1、 some Characters about ionic compound
2、the Introduction of Hydrocarbons