Cho 13g kẽm vào dung dịch axit clohidric. Sau phản ứng thu được V(lit) khí hidro ở đktc a. Tính V và khối lượng muối thu được sau phản ứng b. Cho toàn bộ lượng khí hidro thu được ở trên đi qua đồng (II) oxit . Hãy tính khối lượng đồng thu được sau phản ứng. (biết Cu=64; Cl=35,5 ; Zn=65; H =1)

Các câu hỏi liên quan

I. ADJECTIVES AND ADVERBS: A. Nhieàu traïng töø chæ theå caùch trong tieáng Anh ñöôïc hình thaønh baèng caùch theâm LY sau tính töø. Neáu tính töø taän cuøng baèng Y thì Y ñöôïc chuyeån thaønh i tröôùc khi theâm LY. Neáu tính töø taän cuøng baèng IC thì ta thöôøng theâm AL tröôùc khi theâm LY. - EX: - careful -> carefully ; quick -> quickly ; lucky -> luckily ; traditional -> traditionally ; effective - > effectively ; scientific -> scientifically B. Moät soá tính töø taän cuøng baèng LY : lively, friendly, silly, lovely… C. Well = in good health (khoeû) : How are you ? Very well, thank you. D. Moät soá tính töø coù traïng töø khoâng ñoåi: fast -> fast ; late -> late ; hard -> hard ; far -> far ; early -> early E. Lately = recently : gaàn ñaây Hardly + any/ anybody/ anyone/ anything/ anywhere= Hardly ever = almost never : haàu nhö khoâng F. EXERCICES: 1 .Choose the correct form: 1.- I heard Daniel isn’t very ………….(good/ well) - Well, he fell and hurt himself quite ………..(badly/ bad) 2. – There was a ……….(terrible/ terribly) accident on this road two days ago, wasn’t there? - Yes, two people were killed and the driver of the car was …………(serious/ seriously) injured. 3. - The weather was so ……….awful/ awfully) yesterday. - yes, it was raining quite ………..(heavy/ heavily) so we stayed at home all day. 4. You haven’t cleaned the floor ………….(proper/ properly). It still …………(dirty/ dirtily) Oh,sorry. I is still…………..(dirty/ dirtily). 5. You didn’t look very ……….(happy/ happily) last night. Well, I was disapointed that I did so ………..(bad/ badly) in the exam. 6. – Can you remember what happen? - I can’t remember …….(clear/ clearly).It all happened so ………(sudden/ suddenly) 7. Don’t go up that ladder. It doesn’t look ……….(safe/ safely) - Don’t worry. I’ll climb …………(careful/ carefully). 8. Did you go to Sally’s birthday party? - Yes, It was really a ………..(cheerful/ cheerfully) party.Everybody at the party was …….. (colrful/ colorfully) dressed. 9. – Why do you look so …..(nervous/ nervously)? - Oh, my! I’ve just got a mistake. I interupted my boss while he was on the phone, and he looked at me ……..(angry/ angrily) when I interupted him. 10. – Have you seen Richard ………..(recent/ recently)? - yes, I just met him at Rose’s party two days ago. He seemed very (unhappy/ unhappily). He smiled …………..(sad/ sadly) at me when he saw me. 2. Put in the adverbs: 1. Emma’s toothache was terrible. Emma’s tooth ached ………………………….. 2. Henry was angry. Henry shouted …………………………….. 3. I’m happy sitting here. I can sit here ………………………………………….. 4. He was very thoughtful standing there. He stood there ……………………………………….. 5. The chidren seemed cheerful. The children played ………………………………… 6. The switch is automatic. The machine switches itself off ………………………………… 7. james is very good at speaking English. James speaks English …………………………….. 8. The debate should be public. We need to debate the matter …………………………….. 9. She was charming. She walked ……………………. In front of the audience. 10. Everyone was enthusiastic. Everyonr discussef the idea ………