(2008年上海中考题)某科技小组的同学利用天然资（(2008 Shanghai exam) a student of a technology group uses natural resources）.doc

(2008年上海中考题)某科技小组的同学利用天然资（(2008 Shanghai exam) a student of a technology group uses natural resources） In 2008, Shanghai junior high school graduates unified academic examination physical and chemical examination paper (150 points, 100 minutes) Chemistry part questions and their analysis Relative atomic mass: H-1, C-12, O-16, F-19, Na-23, S-32, Ca-40 Six, fill in the form of questions (10 points) 27. fill in the corresponding material name, chemical formula, material category (refer to simple substance, oxide, acid, alkali, salt) in the following table. Material name carbonic acid silver nitrate Chemical formula Zn SO3 Material categories Alkali (write any kind) The alkali can be sodium hydroxide, calcium hydroxide, potassium hydroxide, produce barium hydroxide, ferric hydroxide, ferrous hydroxide, copper hydroxide, ammonia hydrate in a common base. Answer： Material name zinc sodium hydroxide carbonic acid Three sulfur oxides silver nitrate Chemical formula Zn NaOH H2CO3 SO3 AgNO3 Material categories Elemental Alkali (write any kind) acid oxide salt Seven, individual choice questions (10 points) 28., the following substances in life belong to the solution A. distilled water, B., salt water, C. milk, D. lime milk Analysis: according to the solution is one or more substances dispersed into another substance, forming a uniform and stable mixture concept, judgment belongs to salt water solution; distilled water is pure, not a solution; milk and milk of lime is a mixture of uneven and unstable, all belongs to the emulsion. 29., at room temperature, a classmate measured the approximate pH of some foods, the basic is () A. peach juice 3.5 B. apple juice: 3.2 C. egg white: 7.8 D. milk: 6.5 30. V (V) is known as the metal vitamin, the vanadium oxide in V2O5 valence (is) A.+1 B.+3 C.+5 D.+7 31. the properties of a substance in its change, belonging to physical properties, are ( A. charcoal stability, B. carbon monoxide reducibility, C. alcohol flammability, D. concentrated hy