... khí CO
2
từ hỗn hợp CO và CO
2
bằng cách:
a) Qùi tím, nung.
b) Cho hỗn hợp lội qua dung dịch Ca(OH)
2
, nhiệt phân CaCO
3
c) Oxi, CaCO
3
d) Không thể thu được khí CO
2
từ hỗn hợp CO ...
CaCO
3
+ H
2
O + CO
2
Ca(HCO
3
)
2
.
0,025mol 0,025mol 0,025mol
- Số gam kết tủa CaCO
3
là: (0,1 – 0,025).100 = 7, 5g.
Bài tập 10
- CaO + H
2
O Ca(OH)
2
- Ca(OH)
2
+ Na
2
CO
3
... Dùng CO khử oxit tương öùng.
FeO + CO Fe + CO
2
IV Hôïp kim của sắt
1. Gang
Gang là hợp kim của sắt với cacbon trong đó hàm lượng cacbon
2 – 6%, ngoài ra còn một số nguyên tố khác.
- Gang...
... would be cut down.
47. What is more important than individual kinds of animals and plants?
A. the vanishing of whole habitats.B. the extinction of many species.
C. the rapid advance of the process ... University of Foreign Languages, now works for
an import-export company.
A. who B. whose C. whom D. which
27. _____ is one of my favorite activities.
A. cook B. cooker C. cooking D. cooks
28. One of ...
ecosystem is forgotten. Animals like the great apes, the whales, seals etc thought to be in danger
of extinction.
But even more important, perhaps, than individuals kinds of animals and plants,...
... planet. Each time a species is
lost, the complexity, natural balance, and beauty of our world is diminished.
And what threatens plants and animals ultimately threatens people as well.
86. According ... planet. Each time a species is
lost, the complexity, natural balance, and beauty of our world is diminished.
And what threatens plants and animals ultimately threatens people as well.
36. According ... focuses on the conservation of
three biomes that contain most of the world's biodiversity: forests, freshwater
ecosystems, and oceans and coasts. Among other issues, it is also
concerned (49)...
... BÀITẬP E GRADE 10 – KEYS – MAI LAN HƯƠNG – NGUYỄN THANH LOAN
BÀI TẬPTIẾNGANH 10 - CÓĐÁP ÁN
Biên soạn: Mai Lan Hương - Nguyễn Thanh Loan
Nhà xuất bản Đà Nẵng
Biên soạn năm 2006 theo ... of time, and they
wanted to stop it Spain and Turkey are two countries which stopped homework recently. In
BÀI TẬP E GRADE 10 – KEYS – MAI LAN HƯƠNG – NGUYỄN THANH LOAN
Denmark, Germany and several ... 1 975 , they created a company called Microsoft to sell their
product.
Allen became ill with cancer and left Microsoft in 1983. He recovered a few years later and
started his own company. Meanwhile,...
... postman, a taxi driver, a boatman, an ambulance man, an accountant, a petrol
attendant, a barman and an undertaker. Also, he and his wife, Susan, have a shop and a small hotel.
John lives and ... (7) ___________on an island for
four years. Robinson Crusoe in Defoe’s novel lived on an island for twenty- eight years. People liked
(8)___________novel in England and in many other countries, Daniel Defoe ... people catch the common cold every year.
5. At recess yesterday Trang drank some water and talked with/ to her friends.
24
Tuyển tập các đề thi học sinh giỏi môn TiếngAnhlớp7 ( kèm đáp án)
Đề...
... is being (1) and the
future looks bad . What can each of us do ?
We can not clean up our (2) rivers and seas overnight. Nor can we stop
the
(3) of plants and animals. But we can stop adding ... ……………………………
7
TUYỂN TẬP CÁC ĐỀ THI CHỌN HỌC SINH GIỎI MÔN TIẾNGANHLỚP 9 THCS ( CÓĐÁP ÁN)
(54) the other hand, there are some serious disadvantages. Firstly, many people
become ill and consequently ... hero.
7. The consumers want products that will work ________ and save money. EFFECT
8. Lan Anh is ________ because she misses her parents and friends very much. HAPPY
VII. Read the passage and...
... his role in the company.
A. Not many people realized that he played an important part in the company.
B. Quite a few people realized the importance of his role in the company.
C. Many people realized ... Thanh recommended to us.
C. Dr Thanh recommended the Asia Hotel, which we stayed, to us.
D. Dr Thanh recommended the Asia Hotel, where we stayed at, to us.
33. Few people realized the importance ... best answer to complete each sentence.
6. Children who are isolated and lonely seem to have poor language and ________.
A. communicator B. communication C. communicate D. communicative
7. I haven’t...
... trees and flowers
2.
A. I
B. me
C. my
D. mine
3.
A. but
B. and
C. too
D. also
4.
A. On
B. In
C. Of
D. At
5.
A. but
B. too
C. also
D. and
6.
A. the
B. a
C. an ... câu trả lời đúng:
A. How many floors are there in your school? B. How many floors is
these in your
11,
Chọn từ/tổ hợp từ thích hợp để hoàn thành câu sau:
How many students in your class ... Twenty.
ĐỀ KIỂM TRA HK2 – TIẾNGANHLỚP 6
( CÓĐÁP ÁN)
1,
Chọn từ hoặc tổ hợp từ thích hợp để hoàn thành câu sau:
Excuse me ?
Chọn câu trả lời đúng:
A. Can you say me the time
B. What...
... Thành Câu Sau:
1. In Some Countries Children Normally Go To School bus.
Chọn Câu Trả Lời đúng:
a. By B. With C. In D. On
ĐỀ KIỂM TRA TRẮC NGHIỆM HKII – TIẾNGANHLỚP 6
( CÓĐÁP ÁN)
1. ...
5.
Chọn Từ/tổ Hợp Từ Thích Hợp để Hoàn Thành Câu Sau:
John Robinson Is An English Teacher From England. He For
An Apartment In Ha Noi For His Family Now.
Chọn Câu Trả Lời đúng:
16. ... All Right D. Yes, I Do
17.
Chọn Từ Gạch Chân Cần Phải Sửa Trong Câu Sau:
1. would You Like to Come To the Cafeteria, nga’s?
Chọn Câu Trả Lời đúng:
A. To Come B. Would C. Nga’s D. The...