英语翻译我只知道里面几个单词的意思!真的急用啊!
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英语翻译我只知道里面几个单词的意思!真的急用啊!
英语翻译
我只知道里面几个单词的意思!真的急用啊!
英语翻译我只知道里面几个单词的意思!真的急用啊!
Properties of acids and bases
Acids are corrosive(腐蚀性的) chemicals with a sour taste. All acids have certain chemical characteristics(特性) in common:
1、 They form solutions with a pH<7, so that indicators(指示剂) which change colour at about this pH give the same reaction with all acids, e.g. they turn blue litmus(石蕊) red.
2、 They react with reactive metals(活性金属) to give a salt and hydrogen(氢).
3、 They react with bases, such as metal oxides(氧化物) and hydroxides/hai'drɔksaid/(氢氧化物) to form a salt and water.
4、 They react with metal carbonates(碳酸盐) and hydrogencarbonates(碳酸氢盐) to give a salt, water and carbon dioxide, which appears as effervescence(冒泡) (i.e. bubble appears).混淆
The most common bases are the oxides, hydroxides and carbonates of metals, but a number of other compounds(混合物), such as ammonia 氨and amines胺 also act as(担当) bases. Solutions of bases, known as alkalis(可溶性的碱), have a slippery(光滑的) feel and a bitter(苦的) taste (though, again, you should not taste them). As with acids all bases have certain chemical reactions in common:
1、 If they are soluble(可溶的) in water they give a solution with pH>7, so that they will all have a similar effect on indicators that change colour at about this pH, e.g. they turn red litmus blue.
2、 They react with acids to form a salt, e.g. calcium oxide(氧化钙) will react with hydrochloric acid(盐酸)to form calcium chloride(氯化钙) and water.
我是 发问题的人 忘记放上了.摆拜托高手们了 急用啊!
Help, masters!!! I only know few words in them!!!!!!!!! Hurry, really!
chemical artist
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