Cho 19,5 g Zn tác dụng với dung dịch Hcl vừa đủ

Tính khối lượng kẽm clorua tạo thành

Dàn hết lượng khi H2 sinh ra cho đi qua 32 Fe2O3 nung nóng . Hãy tính khối lượng kim loại tạo thành sau PƯ

Cho 16 , 8 g sắt tác dụng vs dd HCl thu đc muối sắt (II) Clorua và khi thoát ra là

Tính khối lượng muối thu đc

Tính thể tích khi thoát ra

Toàn bộ lượng khí sinh ra dần qua lượng đồng (II) oxit đun nongd . Tính khối lượng kim loại tạo thành

Phân biệt và gọi tên các hóa chất sau : Fe(Oh) 2 Na2SO4 , P2O5 , NaHCO3, NaOH , H2SO4 , Ca(H2PO4)2 , H2S

Cho 11, 2 g bột sắt Phản ứng vừa đủ vs 200 g dd HCl

a Tính thể tích khí H2 sinh ra và khối lượng muối thu đc

b ) Tính nồng độ % đ axit đa dạng

Tính nồng độ % các dung dịch sau PƯ

C

ho x, y , z thuộc R . CMR x^2 + y^2 + z^2 >/ xy +yz +xz

Body started school .... the age of five

I am looking forward ... seeing in June

They are travrling to the airport .. a bus

You have to look .... your little sister when we are out

You should work harder ... his E Pronunciation

try to calm ...... and tell us exactly what has happened

At Boston University , Bell experimented with ways of transmitting speech . a long distance

All the houses in my neighborhood were covered ..... smoke from the factogy

Let's going somewhere for a coffee after this wonderful meeting

The more trees you plant , the most unpollted the air is

Lucky , the weather was very fine and we had a pleasant picnic

There are a lot of E books in the front of the school librery

Nobody have cleaned the room for ages so it looks so dirty and damp

They asked me what did happen last night , but I was unable to tell them

Mr Tuan works from seven in the morning till five hour in the afternoon

yesterday , Mai and you did the needle work yourself to prepare for your technology lesson

Don't talk about your book again . you always talk about it

She looks more attractively than she used to

Mrs. Lần / up / order / to / early / this / the morning / has/ in / get/ to/ meeting / on / get / time/ on

chidren / africa/ don't /enough / and / to / in /food/ eat / warm / have / to / clothers / wear

It's / at / easy/ learn / two / the / languages / same/ to / time

My / like / but / meals / sister likes cooking / washing / doesn't / doing/ she / the up/

You / at having / wonderful / are / in / hoiliday / a / moment / Sapa/ the ?

Some of the (village) ........................... have lived here all their lives

The room still has many of its (origin ) ........ features

He doesn't knoww the ( mean ) .............. of the word

They tried their best to avoid ( get ) . into trafic jams at rush hours

She had her hải ( Wash) ...... and styled

It's only a short trip . We ( be) ... back in an hour

He spends most of his free ime ( play ) ... computer games

We prouce cheaper goods than our ( compete ) ............ do

He has been ( separate ) .. from his wife for a year

chickens / for/ raised / theri small plan / the pupils of class 7a/ last summer

to make / who / more interesting / wanted / the meeting /?

Why / peter / make / sad/ did/ his mother ?

She / used/ the / to / will / noise/ soon / get

teenagers/ the/ televison / like / most / around / world

children / after / their / brush / should/ meals / teeth

see/ at the same time / when / live TV programs / help / events/ us / happening/ are / they

does/ before / his/ bed / he / homework / going / always / to

Compost / make / from household and garden waste