user-avatar
lekieutrinh21
2 năm trước
Một dung dịch chứa 0,2 mol Na+; 0,1 mol Mg2+; 0,05 mol Ca2+; 0,15 mol HCO3- và x mol Cl- . Giá trị của x là A. 0,15 B. 0,35 C. 0,2 D.0,3
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Homework: 1 Present continuous or simple? (A-B) At work Mark is talking to Alan in the corridor. Complete their conversation. Put in the present continuous or simple of the verbs. Mark: (►) Are you looking (you / look) for someone? Alan: Yes, (►) / need (I / need) to speak to Neil. He isn't in his office. Mark: (1) ....... (he / talk) to the boss at the moment. (2) (I / think).......... (3) ......... (they / discuss) money. Alan: Oh, right. And what about you? (4) Are ........ (you / look) for someone too? Mark: Yes, Linda. (5) ......... (you / know) where she is? Alan: Oh, she isn't here today. She only (6) .........(work) four days a week. (7) ............ (she / not / work) on Fridays. She'll be here on Monday. Mark: Thank you. (8) You know (you / know) a lot about Linda. Alan: Well, most days (9)....................................... (I / give) her a lift, Or (10)............... (She / give) me one. (11) ……………………. (she / live) Quite close to me. (12)....................................... ( t / save) petrol. Mark: Yes, of course. Good idea. Yes, (13) ........................................(1/ agree). Well, (14).......................... (I / waste) my time here then. I'll get back to my computer. 2 Present continuous or simple? (A-C) Complete the sentences. Put in the present continuous or simple of the verbs. ► I'm writing (I / write) to my parents. / write (I / write) to them every weekend. 1 it snowing (it / snow) outside. It come (it / come) down quite hard, look. 2 Normally I ......... (I / start) work at eight o'clock, but .........(I / start) at seven this week. We're very busy at the moment. 3 I haven't got a car at the moment, so ......(I / go) to work on the bus this week. Usually ....... (I / drive) to work. 4 The sun ... (rise) in the east, remember. It's behind us so ........(we / travel) west. 5 I'm afraid I have no time to help just now. ..... (I / write) a report. But ....................... (I / promise) I'll give you some help later. 6 ......... (I / want) a new car ..........(I / save) up to buy one. 3 Always (D) Complete the sentences. Use always and the present continuous or simple. ► Melanie: Tom talks too much, doesn't he? Rita: Yes, and he's always talking about football. ► Laura: You forget your keys every time. Trevor: I try to remember them, but / always forget. 1 Claire: Sarah takes the train every day, doesn't she? Mark: Yes,..................................................................the train 2 Vicky: Rachel misses lectures much too often in my opinion. Emma: I agree............................................................................................................... lectures. 3 Mike: Every time I drive along here, I go the wrong way. Harriet: But it's very simple, isn't it? Why......................... the wrong way? 4 David: Trevor and Laura argue much too often, I think. Melanie: I know ....................................................................................................................................

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team