Ai giúp em đi ạ , em cần gấp Dung dịch (Z) thu được bằng cách pha trộn 200ml dung dịch HNO3 x ( M ) ( dung dịch (X)) với 300ml dung dịch HNO3 y (M) ( dung dịch (Y)) . Cho dung dịch (Z) tác dụng với CaCO3 dư thu được 3,136 lít không màu ( đo ở đktc) 1.Tính nồng độ mol của dd (Z) ? 2.Dung dịch (X) được pha bằng cách thêm nước vào dd (Y) theo tỉ lệ thể tích V(H2O) : V(Y) = 3:1 . Tính giá trị của x và y ? ( phải ÁP DỤNG SƠ ĐỒ ĐƯỜNG CHÉO LUÔN NHA)

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Choose the past simple or past continuous: 1. What ________________________ (you / do) when I ________________________ (call) you last night? 2. I ________________________ (sit) in a café when you ________________________ (call). 3. When you ________________________ (arrive) at the party, who ________________________ (be) there? 4. Susie ________________________ (watch) a film when she ________________________ (hear) the noise. 5. Yesterday I ________________________ (go) to the library, next I ________________________ (have) a swim, later I ________________________ (meet) Julie for a coffee. 6. We ________________________ (play) tennis when John ________________________ (hurt) his ankle. 7. What ________________________ (they / do) at 10pm last night? It ________________________ (be) really noisy. 8. He ________________________ (take) a shower when the telephone ________________________ (ring). 9. He ________________________ (be) in the shower when the telephone ________________________ (ring). 10. When I ________________________ (walk) into the room, everyone ________________________ (work). Choose the correct form of the verb: use simple present and simple past 1.- I ________________________ to do that last Monday ( want) 2.-You were there, I ________________________ you ( see) 3.- Lis ________________________ 5 years old ( be) 4.- Does she ________________________ chocolate? ( like) 5.- Sarahi ________________________ the questions ( not - answer) 6.- Daniela ________________________ with him last week ( not- break up) 7.- ________________________ a dog last month? ( she - have ) 8.- It was hot in the room, so I ________________________ the window ( open) 9.- The film was very long, it ________________________ at 7:15 and finished at 10:00( start) 10.- You ________________________ around the world every year ( travel ) 11.- ________________________ me? ( he - hate ) 12.- The accident ________________________ last Sunday ( happen) 13.- Roberth ________________________ maths ( not- like) 14.- Anna's grandfather ________________________ when he was 90 years old ( die) 15.- They ________________________ their free time ( enjoy) 16.- Last year, we ________________________ our free time ( enjoy) 17.- Jessica ________________________ to the concert last weekend ( go)