user-avatar
2634895523502227
2 năm trước
Lập phương trình hóa học của các phản ứng sau : a) P + O2 --> P2O5 b) KCLO3 --> KCL + O2 c) Al + CL2 --> AlCl3 d) C2H4 + O2 --> CO2 + H2O e) KCLO3 --> KCL + O2 f) Fe + O2 --> Fe3O4 g) P + O2 --> P2O5 h) CH4 + O2 --> CO2 + H2O
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

IV.Choose the answer. 1-Lan is……..beautiful……..clever. a-so / that b-enough / to c-both / and 2-What do you intend………..? a-to buy b-bought c-buying 3-My grandfather stopped………..cigarette. a-to smoke b-smoked c-smoking 4-Tim is old enough……….with machines. a-work b-working c-to work 5-I wish I…………play football like Ronaldo. a-can b-could c-am able to 6-How many people took part……….the contest. a-at b-in c-on 7-The village…………….noisy. a-is become b-is becoming c-are becoming 8-She told me……..these books to her house. a-to take b-take c-taking 9-Mary is looking………her school bag. a-for b-of c-with 10-Susan has worked for that company………..4 years. a-Since b-during c-for V. Write the correct of each verb in the brackets to complete the following sentences. 1. We all adored (1.do)_____ aerobics when we were young. 2. 30 years ago, we (2.not have)________ mobile phone. 3. The girl (3.cry)_____ when a fairy (4.appear)______.

II. Read the passage, and choose the correct answer A, B, C or D for each question. Saving the Environment: One Home at a Time Pollution can be seen not only throughout the world, but also in our own homes. It comes from household chemicals, the amount of water people use and the waste people produce and throw away. What can be done to stop this pollution? Surprisingly, a person can help save the environment by doing simple things. First, we need to recycle, which allows products to be used over and over again. Recycling can also reduce the number of trees cut down to produce paper products. It takes very little effort. It is not hard to place plastic and glass bottles, aluminum cans and paper in a bin. Anyone can do it. Second, we need to watch the amount of water used at home. It can be conserved by taking short showers instead of baths, repairing leaky faucets, using the dishwasher or washing machine only when fully loaded, or simply turning the faucet off while brushing your teeth. Third, we need to reduce waste. We need to recycle whenever possible, but should also try to use this waste effectively. For example, grass clippings and food scraps can be made into compost for plants. The average person produces 4.3 pounds of waste every day, but we can reduce that amount by recycling and reusing. If we do our part in our own homes, we can help keep the planet from becoming more polluted. 1. Pollution is caused from the following sources except . A. water in rivers B. water from households C. wastes D. house chemicals 2. Recycling can help us . A. never cut down trees B. produce more paper products C. place garbage bins easily D. use products again and again 3. In order to save water, we can do all of the following things except . A. fully use the washing machine B. repair leaky faucets C. take short showers instead of baths D. turn the faucet off while brushing your teeth 4. Recycling helps to reduce waste because . A. plants need to develop B. waste can be recycled and reused C. a person can do it in his home D. an average man produces compost for plants 5. The word “It” in paragraph 2 refers to . A. cutting down B. the number C. recycling D. effort III. Rewrite the sentences, using the words in brackets. 1. Keep silent or you will wake the baby up. (If) ………………………………………………………………………………………… 2. She has a headache after work every day. She works in a noisy office. (If) ………………………………………………………………………………………… 3. Because it rained heavily, the road in front of my house was flooded. (due to) ……………………………………………………………………………………………. 4. Noise pollution happens. There is a change in animals’ living pattern. (causes) ………………………………………………………………………………………

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