化学试卷(国外英文资料).docVIP

化学试卷(国外英文资料) One, choose the topic. 1, 1869, the Russian chemical house he made the first periodic table, reveals the internal relation between the chemical element, one of very important milestone in the history of chemistry. The following statement about the periodic table that we often use is correct () A. the periodic table has seven runs and seven cycles The periodic table has 18 columns, or 18 people The short period is the first, second, third and fourth cycles D. Ⅰ A family of elements are all metals Your answer: There are 18 columns in the periodic table, but only 16 people, so B is wrong. The short period refers to the first, second, and third cycles. Ⅰ group elements of hydrogen is A nonmetal, so item D is wrong. Answer: A, The main research points are: the periodic table of elements and the periodic table of the elements NA represents avogadros constant. The following statement is true () A.0.5 moles of Al and the sufficient amount of hydrochloric acid were transferred to 1NA In the standard case, the number of molecules in 11.2 L SO3 is 0.5 NA The number of electrons in C. 0.1 mole is 1NA The mixture of d. 46 g NO2 and N2O4 contains 1 na Your answer: 1 mole of Al and hydrochloric acid completely react to transfer 3 moles of electrons, 0.5 of the electron number should be 1.5 mol, and the A is incorrect. SO3 is solid, and B is not true; Because of the 2NO2N2O4, the number of molecules in the 46 g mixture is less than 1 mole. Answer: C Focus on the knowledge: the amount of matter The development of green food is an important measure to improve the quality of human existence and the maintenance of health. A. foods that are rich in chlorophyll B. Green fresh vegetables C. safe, pollution-free, pollution-free nutrition food Your answer: Green food is a nutritious food that is safe, pollution-free and pollution-free. Answer: C Main research points: chemistry and social development-chemical history, the relation between life and so on The following equations o