Bài 1: Cho 3,08g kloại (M) td với H2SO4 lõag tạo ra 8,36g muối
a) Tính V H2?
b) Xác định kloại đó
Bài 2: cho 10,3g hỗn hợp Al, Fe, Cu td đ HCl dư tạo ra 5,6l khí H2 và 2g chất ko tan
a) tính %mFe
b) cho muối thu đc td AgNO3 dư tạo ra m kết tủa(AgCl)
Bài 3: cân =
Fe+ HNO3➜ Fe(NO3)3+ NxOy+ H2O
Finish the second sentence so that it has similar meaning to the first one beginning with the given words
1. The last time I did gardening was three months ago
➞I have not.....................
2. Although she lives quite far away, she walks to school every day
➞Despite................
3. The neighbor's dog woke me up this morning
➞I....................
4. " You'd better not buy that camera."She said to me
➞She advised me................
Combine two sentences into a new one using the given words in bracket. Do not change the given words in any way
1. I didn't have the key. I couldn't get into the house( Because)
➞.......................
2. I like Chinese. I can't speak it perfectly( wish)
➞
3. You eat too much. You will be fatter( more)
➞
4. They are going to visit the villagers. Their houses were swept away by the unexpected flash flood ( whose)
➜
Bài 1: E= (x-3) / √x-1 -√2
a) RGBT
b) Tính E biết x= 4(2-√3)
c) Tìm GTNN của E
Bài2: Tính
1) x+√14 / y+√xy
2) √a +a√b -b -b√a / ab-1 với a, b >=0; ab khác 1
3) (1/5-2√6 +2/ 5+2√6) × (15+ 2√6)
4) √(1-√2019)^2 × √2020+2√2019
5) a+√ab +b/ a√a+ b√b - √a - √b -1 / a-b với a>0 , b>0 , a khác b