解析 CA compound is made up of 2 or more elements chemically combined. It has different properties from the elements it is made of. It is a pure substance with fixed melting and boiling points. It can only be separated by chemical means. ...
Which statement best supports the fact that air is a mixture and not a compound? B A Air contains different elements. B Air can be separated by physical methods.C The composition in air remains constant throughout the world.The water vapour is a chemical compound.D 相关知识点: 试题来源...
7 When two elements react together, a compound is formed.Which statement is correct? D A Equal masses of the elements must be used. B The compound shows similar chemical properties to those of the elements. C The elements must be both non-metals. D The compound will melt and boil at a...
22 Compound L has the following structure.O Which statement about compound L is incorrect?C A It can undergo a condensation reaction. B It can undergo a hydrolysis reaction C It can undergo reduction reaction. D It can be attacked by a nucleophile. ...
7 Which statement about an alloy is correct? C A It is a compound made of two or more elements, one of which is a metal. B It is a layer of a metal plated onto another metal. C It is a mixture of a metal with other elements. D It is a single element. 相关知识点: 试题来...
Which statement is an opinion about ants? A.The eyes of an ant are called compound eyes. B.Ants live in colonies. C.Ants eat a variety of foods. D.Ants love eating Gram's cookies the most. 相关知识点: 试题来源: 解析 D 反馈 收藏 ...
14 A solid organic compound can be purified by recrystallisation.Which statement(s)about recrystallisation is/are true?1 The organic compound is more soluble in hot solvent.2 The hot solution is cooled before the purified organic compound is collected.3 The melting point of the purified organic ...
The statement - the compound word central processing unit null which is used for the audio松本 達郎
Ice (5.0 grams) at 0 degrees Celsius is added to 25 grams of liquid water at 20 degrees Celsius. Which statement best describes the system when thermal equilibrium is reached? a. Part of the ice has melted; the remaining ice and water a...
Select the correct statement that describes what happens when the vapor pressure of a liquid is equal to or greater than atmospheric pressure. a. The liquid will freeze. b. The liquid will boil. c. The triple point will occur. d. The liquid...