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(满分 1 0 0分 ,时间 4 5分钟 )一、选择题 (每小题有 1～ 2个正确答案 ;每小题 3分 ,共 4 5分 )1 打雷放电时 ,空气中有极少量的氧气会转化成臭氧 .下列有关说法 ,正确的是 ( ) . (Ａ)该变化是物理变化 (Ｂ)该变化是化学变化 (Ｃ)氧气和臭氧的
(Out of 100 points, time 45 minutes) 1. Multiple-choice questions (1 to 2 correct answers for each question; 3 points for each question, a total of 4 points) 1 There is a very small amount of air in the thunder and lightning discharge. Oxygen will be converted into ozone. The following statement is correct, (). (A) The change is a physical change (B) The change is a chemical change (C) Oxygen and ozone