Hãy cân bằng các phương trình hóa học cho biết phản ứng nào là phản ứng phân hủy, phản ứng hóa hợp. a. Al + O2  Al2O3 b. Fe(OH)3  Fe2O3 + H2O c. P + O2  P2O5 d. CaCO3  CaO + CO2 e. Cu(NO3)2  CuO + NO2 + O2 f. Na2O + H2O  NaOH

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Exercise 3: Fill the gap 1.The books, ________ I'd ordered over the internet, took nearly three weeks to arrive. 2.The books _________ I'd ordered from a bookshop arrived the following week. 3.My parents, ________were born in the north of England, moved to London to find work. 4.The man ________ lives upstairs is always playing music when I'm trying to get to sleep. 5.The building __________I live in was built in the 9s. 6.The building __________ I live was built in the 9s. 7.The car's making a funny noise again,_______ means we'll have to get someone to look at it. 8.The employee to _________you refer is no longer working for this company. 9.Do you remember the name of the man __________car you crashed into? 10.Have you any idea _________they were arguing about? 11.The hotel ______we stayed was very good for the price. 12.The woman _________is sitting at the desk is Mr. Winter's secretary. 13.I cannot remember the reason _________he wanted us to leave. 14.Jane, ____________ mother is a physician, is very good at biology. 15.She didn’t see the snake _____was lying on the ground 16.Do you know the shop _______ Andrew picked me up? 17.That man is the writer _____________wrote a best- selling novel 18.Here is the CD ___________ you thought you had lost. 19.A professor is someone _______teaches in a university. 20.The only present _______I didn’t like was the gold belt. 21.A meteorologist is someone _________ knows about the weather. 22.This is the book __________I wrote to you about. 23.Anybody ____________ wants to join the drama society must sign up now. 24.This is the shop ______________ is so expensive. 25.Ciro´s was the best club _________ I have ever been to. 26.The tower _________ blew down in the storm was over years old. 27.The match _______ we saw was so boring. 28.Did I tell you about the people ____________________ live next door? 29.The horse _____________ won the race belongs to an Irish woman. 30.I love the ice cream __________ they sell in that shop.