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Adélard Baudelaire
Adélard Baudelaire

Adélard Baudelaire
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Adélard Baudelaire

Câu trả lời:

A)sắt phản ứng với H2SO4 loãng:                           Fe+H2SO4 dấu mũi tên FeSO4+H2 mũi tên hướng lên                                                                đồng không phản ứng với H2SO4 loãng:             Cu+H2SO4(loãng không xảy ra)                             B)%Cu=Khối lượng Cu/Khối lượng hợp kim x 100%=2,7/5x100%=54%                                           %Fe= Khối lượng Fe/Khối lượng hợp kim x 100%= 2,3/5x100%=46%                                             
Adélard Baudelaire

Câu trả lời:

A)sắt phản ứng với H2SO4 loãng: Fe+H2SO4 dấu mũi tên FeSO4+H2 mũi tên hướng lên   đồng không phản ứng với H2SO4 loãng: Cu+H2SO4(loãng không xảy ra)                             B)%Cu=Khối lượng Cu/Khối lượng hợp kim x 100%=2,7/5x100%=54%                                           %Fe= Khối lượng Fe/Khối lượng hợp kim x 100%= 2,3/5x100%=46%                 
Adélard Baudelaire

Câu trả lời:

Our house was painted last month.Ellen is taken to school by her father every day.My room is being cleaned by my mother now.This room has been operated by Mary since 10 o'clock.Someone must be found to take over his position.20 demonstrators were arrested by the police yesterday.That book was bought by Tom yesterday.The city was destroyed by fire in the 17th century.Our work is being watched by the teacher at the moment.The house has been built for 2 months.This palace was built a long time ago.The wall must be cleaned before you paint it.This garden was designed by a famous architect in the middle of the 16th century.A lot of food is thrown away every day.This air ticket was ordered for Emma’s mother last week.Her new dress was lent to her friends last week.A lot of money is spent on food every day.Brian’s car is being repaired by a mechanic at the moment.A letter is being typed by his secretary now.These gifts have already been handed to the customer by the shop manager.The first prize was awarded to my friend - John by the board of directors this morning.Have the Christmas cards been sent to her family yet?Ann was given some roses at her last birthday.The fridge has been moved to the second floor for two days now.Some cups of coffee were brought to the visitors by my mother when they were chatting.The note has not been taken to the manager yet.Has the work been done yet?How can this problem be dealt with?How much money has been spent so far?I think Jane will be chosen for the position by the board of directors soon.The lost man was found by the police yesterday.These postcards will be sent to our friends next week.They were told this story by their grandmother when they visited her last week.This cake was baked by Jim yesterday.
Adélard Baudelaire

Câu trả lời:

bt làm nhưng không ghi công thức đc bn ui

 
Adélard Baudelaire

bài văn bày tỏ cảm xúc của em về một người mà em yêu quý.(miêu tả nhưng ít)