Một buổi làm thực hành thí nghiệm cần khoảng 12 lọ oxi , mỗi lọ có dung tích khoảng 200ml( ở điều kiện thường ) . Tính khối lượng KMnO4 tối thiểu cần dùng để thu đc lượng oxi trên( cho rằng 1 mol khí chiếm thể tích 24 lít ở điều kiện thường và ko có sự hao hụt trg quá trình điều chế khí) - M,N CHỈ E VS AK

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revision:imperatives write imperative statements 1.(not go) out.it's raining heavily 2.it's so cold.(close) the window please 3.(brush) your teeth right after meals 4.(not forget) to come bach early 5.(read) the story aloud 6.(not make) so much noise 7.(not talk) in class 8.(remember) to take good care of your teeth 9.(turn) off the cassette,please . it's so noisy 10.(not) eat green fruit , you'll be sick write sentences , use the cues given then turn into negative and interrogative 1.the students/grade 7/ go/excursion/last year ______________________________ ____________________________ _______________________________ 2.minh/be/fourteen/next month _____________________________ _________________________________- -_______________________________ 3.mr.brown/teach/english/now __________________________________ ___________________________________ _________________________________ 4.she/do/aerobics/every morning ___________________________ _______________________________ ___________________________________ 5.he/eat/a lot of sweets/last year _______________________ ________________________ __________________________ 6.they/have/party/tonight ____________________________ ______________________________ _____________________________ 7.she/forget/do/her homework/yesterday _________________________ ___________________________ ____________________________ 8.they /work/on/farm/at the moment ___________________________ _________________________ ___________________________ 9.he/often/play/sport/after school __________________________ _________________________ ___________________________ 10.the dentist/fill/the cavity/him/tomorrow _________________________________ ______________________________ ________________________________