Có các kim loại Fe ,Al và dung dịch axit clohiđric .Nếu khối lượng sắt vào nhôm bằng nhau ,em sẽ chọn hóa chất nào để có thể điều chế được nhiều khí hiđro hơn ?Nếu số mol Fe và Al bằng nhau ,em sẽ chọn hóa chất nào để có thể điều chế được nhiều khí hiđro hơn ?Nếu cùng thu được những thể tích hi đro bằng nhau ,em sẽ chọn chất nào để tiết kiệm axit hơn ?

Các câu hỏi liên quan

Bài 1: Chọn đáng án chính xác nhất. và giải thích đó là câu so sánh nào? #1 Mary is _____ responsible as Peter. more the most much as #2 She is _____ singer I’ve ever met. worse bad the worst badly #3 It is _____ in the city than it is in the country. noisily more noisier noisier noisy #4 She sings _____ among the singers I have known. the most beautiful the more beautiful the most beautifully the more beautifully #5 She is _____ student in my class. most hard-working more hard-working the most hard-working as hard-working #6 The English test was _____ than I thought it would be. the easier easy easier easiest #7 English is thought to be _____ than Math. harder more hard hardest the hardest HOÀN THÀNH Bài 2: Chọn đáng án chính xác nhất.và giải thích đó là câu so sánh nào? #1 Jupiter is _____ planet in the solar system. the biggest the bigger biggest bigger #2 She runs _____ in my class. the slowest the most slow the slowly the most slowly #3 My house is _____ hers. cheap than cheaper more cheap than cheaper than #4 Her office is _____ away than mine. father more far farther far #5 Tom is _____ than David. handsome the more handsome more handsome the most handsome #6 He did the test _____ I did. as bad as badder than more badly than worse than #7 A boat is _____ than a plane. slower slowest more slow more slower HOÀN THÀNH Bài 3: Chọn đáng án chính xác nhất.và giải thích đó là câu so sánh nào? #1 My new sofa is _____ than the old one. more comfortable comfortably more comfortabler comfortable #2 My sister dances _____ than me. gooder weller better more good #3 My bedroom is _____ room in my house. tidier than the most tidy the tidiest more tidier #4 This road is _____ than that road. narrower narrow narrowest more narrow #5 He drives _____ his brother. more careful than more carefully more carefully than as careful as #6 It was _____ day of the year. the colder the coldest colder coldest HOÀN THÀNH Bài 4: Chọn đáng án chính xác nhất.và giải thích đó là câu so sánh nào? #1 He is (clever) _____ student in my group. cleverer cleverest the most clever the cleverest #2 She can’t stay (long) _____ than 30 minutes. longer more longer longest longger #3 It’s (good) _____ holiday I’ve had. better the best goodest gooddest #4 Well, the place looks (clean) _____ now. more cleaner more clean cleaner cleanest #5 The red shirt is better but it’s (expensive) _____ than the white one. expensiver the most expensive more expensive as expensive #6 I’ll try to finish the job (quick) _____. quickly quicker more quickly quicklier #7 Being a firefighter is (dangerous) _____ than being a builder. more dangerouser dangerousely more dangerous the most dangerous Ai giúp mình với ạ!