Cần bao nhiêu gam Al pứ với H2SO4 để sinh ra lượng H2 để khử hết 4.8g CuO

1Cho SO3 + 0.5l dd NaOH 3 M ra 2 muối tính CM 2 muối 2 cho 200ml dd H2SO4 1M vào 300ml dd NaOH 2M Tính CM các chất có trong dd muối

Để trung hòa 1 dd có chứa 196g dd H2SO4 a) Cần dùng bao nhiêu g NaOH 20% b) Nếu trung hòa lượng Axit bằng KOH 40% ( D= 1,39 g/ml) cần dùng bao nhiêu ml dd KOH ?

write a short paragraph about a traditional craft,its benefits and challenges

Lượng H2O cần hòa tan vào 200g dung dịch muối 8% để tạo thành dung dịch muối mới có nồng độ 5%

Fill in each blank with a suitable word given in the box to complete the following passage.

expensive      dangerous                 waste              accidents

make         performances                crowds          preserve

Disadvantages of Festivals

Although people love festivals very much, there are also some disadvantages. First, festivals are very costly. Because the general purpose of festivals is to (31) ___________ cultural heritages, a nation is willing to spend a lot of money on this. Moreover, during a festival, most people do not work but spend money on (32)___________ gifts for their friends and relatives. 

Second, festivals can be dangerous. People may drink a lot during a festival and cause road (33)________. In many festivals, there are races like cow-racing and elephant racing which may be (34)___________,  especially for children. Moreover, in some festivals, when people rush to see the events, they may also (35)__________ other people to get hurt. Third, festivals may affect the environment. After a festival, the roads are full of colorful paper, flowers, (36)____________ cans or bottles that people throw away. Trees along the roadsides may be damaged by the (37)_____­­­_______ . Furthermore, the noise from music and other (38)_________ also cause noise pollution.

đoạn văn thuyết minh về loài cây( cấu tạo và công dụng)

giải giúp ạ em cần gấp

A. Using the given words to make meaningful sentences.(0.5)

1. Tet/ not only/ a time/ love/ but also/ people/ express/ thanks / Gods/ ancestors

…………………………………………………………………………………………………………………………………………………………………………………………………………

2. celebrate/ Tet/ Vietnamese people/ make/ tasty/ foods/ decorate/ houses.

………………………………………………………………………………………………………………………………………………………………………………………………………….

3. Children/ like/ Tet/ it/ long holiday/ moreover/ can/ receive/ lucky money.

…………………………………………………………………………………………………………………………………………………………………………………………………………

4. Use/ computer/ your hobby/ can/ harmful/ both/ health/ social life.

………………………………………………………………………………………………………………………………………………………………………………………………………….

5. If/ you/ use/ computer/ much/ will not/ time/ your family/ friends.

……………………………………………………………………………………………………

……………………………………………………………………………………………………

giải giúp em với 

Nguyên tử X nặng gấp 2 lần phân tử metan CH4 .Tính nguyên tử khối và cho bt X là nguyên tố nào