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5 tháng 1

Viết đoạn văn thể hiện tỉnh cảm cảm súc bài thơ mầm mon

3 tháng 1

là đừng ngu như nó

2 tháng 1

a, \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

b, \(Fe\left(OH\right)_3+3HCl\rightarrow FeCl_3+3H_2O\)

c, \(3Ca\left(OH\right)_2+2FeCl_3\rightarrow2Fe\left(OH\right)_3+3CaCl_2\)

2 tháng 1

1. \(C\%_{NaCl}=\dfrac{10}{10+190}.100\%=5\%\)

2. \(n_{NaOH}=\dfrac{4}{40}=0,1\left(mol\right)\)

\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,1}{0,4}=0,25\left(M\right)\)

3. \(n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)

PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)

____0,3______0,6______0,3___0,3 (mol)

a, \(m_{Mg}=0,3.24=7,2\left(g\right)\)

b, \(C_{M_{HCl}}=\dfrac{0,6}{0,2}=3\left(M\right)\)

c, \(m_{MgCl_2}=0,3.95=28,5\left(g\right)\)

2 tháng 1

Đề là gì vậy ạ?

2 tháng 1

D. cooked

2 tháng 1

11b; 12C; 13A; 14D; 15D

11. B

12. C

13. A

14. D

15. D

44. If you buy an extra battery at the same time as the digital camera, we can offer you a .............................. of 10%. (8) 45. Our supermarket stocks over a thousand household ............................. at low, low prices! (8) 46. Nine out of ten shoppers who tried our washing powder preferred it to any other leading ............................. (5) 47. When I checked the ............................. on my way out of the supermarket, I noticed that I had paid twice for the...
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44. If you buy an extra battery at the same time as the digital camera, we can offer you a .............................. of 10%. (8) 45. Our supermarket stocks over a thousand household ............................. at low, low prices! (8) 46. Nine out of ten shoppers who tried our washing powder preferred it to any other leading ............................. (5) 47. When I checked the ............................. on my way out of the supermarket, I noticed that I had paid twice for the fruit. (7) 48. If you take something back to the shop, you might get a ............................. or be offered another item instead. (6) 49. If the ............................. situation continues to worsen, the government may have to take steps. (8) 50. You only paid €30 for such a gorgeous hat? That’s a real .............................! (7) 51. Waiter! Do you think you could bring us the ............................., please? (4) 52. There’s very little heavy industry in my country, so we import a lot of .......................... from abroad. (5) 53. Businesses are complaining that the ............................. of labour is rising. (4) 54. This is a robbery! Put all the money from the ............................. in this sack. Now! (4) 55. I need to find a bank because I didn’t bring enough ............................. out with me. (4) 56. Come to Barons summer .............................! Everything is down 30%! (4)

SOS

0
2 tháng 1

\(CH_2=CH_2+H_2O\underrightarrow{^{t^o,xt}}C_2H_5OH\)

\(C_2H_5OH+O_2\underrightarrow{^{t^o,mengiam}}CH_3COOH+H_2O\)

\(2CH_3COOH+Ca\left(OH\right)_2\rightarrow\left(CH_3COO\right)_2Ca+2H_2O\)

13 tháng 3

\(CH_2=CH_2+HOH\underset{xúctác}{\overset{t^{o}}{\xrightarrow{}}}CH_3-CH_2-OH\)

\(CH_3CH_2OH+O_2\underset{}{\overset{mengiấm}{\xrightarrow{}}CH_3COOH}+H_2O\)

\(2CH_3COOH+CaCO_3\rarr\left(CH_3COO\right)_2Ca+CO_2^{}+H_2O\)