before she (leave)....the room , she (tidy up).... all the clothes yesterday chia thì nha

Tính pH của dung dịch X gồm KOH 0.06M và NaOH 0.04M

a,Rut gon P b,Tim tat ca cac gia tri cua x de P < 1 giup tui nha cac aeee@@

Cho bốn điểm A(-2; -3), B(3; 7), C(0; 3), D(-4; -5).CMR hai đường thẳng AB và CD song song.

ptich nội dung nghệ thuật 10 câu thơ đầu tiên trong Truyện Kiều

What ______ (you / do) tonight ? Would you like to come and watch the game?

Vẽ đậu mầm NL: Tui k7/m8 còn ae ?

II)-Complete the sentences, using the correct form of the words in brackets. 1. The soil becomes _______________ because of the use of so many pesticides and fertilizers. (contaminate) 2. _______________ waste spills can contaminate groundwater. (industry) 3. In many developing countries, water pollution is usually a leading cause of ________________. (die) 4. ____________ elements have been found in both ground and underground water sources. (pollute) 5. Fish and many other animals are killed by ______________ in their habitat. (pollute) 6. Astronomers are concerned about light pollution because they have __________ in viewing activities in the sky and outer space. (difficult) III)-Rewrite the sentences, using the words in brackets. You can make some changes. 1. There are asthma, allergies and other respiratory illnesses when air pollution happens. (leads to) 2. Aquatic life suffers or dies because there is thermal pollution. (because of) 3. Water in the Cau River becomes brown and has terrible smell because the waste water is released from the paper mill in Thai Nguyen City. (so) 4. People use too much herbicide to treat weeds, so water in rivers, canals, lakes are extremely polluted and has bad effects on people’s health. (because) 5. Many fish in the river die due to the increased temperature of water. (because) 6. Because plastic bags take so long to decompose, nearly all of them still exist in the environment today. (so) < đang gấp ah >

1. Cho 11,2g sắt vào 54,57g dung dịch axitclohidric 20%. Nồng độ của muối trong dung dịch thu được sau phản ứng là ? 2 . Cần tối thiểu bao nhiêu gam KMnO 4 để điều chế ra lượng oxi đủ phản ứng hết với 8,4g sắt CHỈ CẦN GHI KẾT QUẢ THÔI

vẫn là kiểu này ok hơn ahihi(Tìm GTNN nha