2010年北京化学中考试题（Beijing chemistry entrance examination in 2010）.doc

2010年北京化学中考试题（Beijing chemistry entrance examination in 2010） 2010 Beijing senior middle school entrance examination Chemistry examination paper School name registration number instructions to candidates 1. this paper a total of 8, a total of four questions, 35 items, out of 80 points. The exam time is 100 minutes. 2. accurately fill in the name of the school, the name and the ticket number of the examination paper and the answer card. 3. answers are marked or written on the answer sheet, answer invalid in the papers. 4. on the answer card, choose questions with 2B pencil answer, other questions with black handwriting signature pen answer. 5. return the test paper, answer card and draft paper at the end of the examination. 6. the meaning of = and in the chemical equation of the test paper is the same. The relative atomic mass H 1 C 12 N 14 O 16 Na 23 S 32 Cl 35.5 may be used A choice every day (with only one option. A total of 25 items, each item of 1 points, a total of 25 points) In the air composition, about 21% of the volume fraction is A. oxygen B. nitrogen C. carbon dioxide D. rare gas The most abundant nonmetallic elements in the earths crust are A. oxygen B. silicon C. aluminum D. iron What is pure in the following substances? A. lime water B. air C. pig iron D. dry ice The following substances are burned in oxygen and produce a large amount of white smoke. A. B. C. D. alcohol red charcoal wire The following substances are added into the water to form a solution. A. milk B. flour C. sucrose D. peanut oil The main materials used in the following articles for daily use are organic synthetic materials A. B. blue and white porcelain plastic cups C. cotton towel D. stainless steel pot Sodium carbonate is an important chemical raw material, commonly known as sodium carbonate A. soda ash, B. caustic soda, C. quicklime, D. slaked lime The essential difference between carbon and oxygen is source: subject network There are different A. proton number, different B. ele