Giúp mình câu c với! Cần gấp ạ! Mai em thi
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Những câu hỏi liên quan
PB
1
20 tháng 12 2022
\(m_{NaCl}=\dfrac{150.10}{100}=15\left(g\right)\\ m_{H_2O}=150-15=135\left(g\right)\)
Đong 15 gam NaCl khan, 135 gam nước cho sẵn vào cốc nước. Sau đó hóa tan 15 gam NaCl vào nước, dùng đũa thủy tinh khuấy đều thu được dd như theo yêu cầu của đề bài
HH
1
5 tháng 5 2023
Câu 4:
a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(4K+O_2\underrightarrow{t^O}2K_2O\)
b, \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
c, \(2K+2H_2O\rightarrow2KOH+H_2\)
\(CaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
L
10 tháng 12 2021
Tham khảo:
In a spell of dry weather, when the Birds could find very little to drink, a thirsty Crow found a pitcher with a little water in it.
But the pitcher was high and had a narrow neck, and no matter how he tried, the Crow could not reach the water. The poor thing felt as if he must die of thirst.
Then an idea came to him. Picking up some small pebbles, he dropped them into the pitcher one by one. With each pebble the water rose a little higher until at last it was near enough so he could drink.
“In a pinch a good use of our wits may help us out.”
TP
0
3N
1
YN
2 tháng 3 2022
1 The distance from my home to school is about 3 km
2 My mum used to live in a small village when she was small
3 Despite being a millionaire , he lives in a small flat
4 when does the festive take place ?
5 It is about two kilometres from my home to school
6 he didn't use to ride his bike to school
7 Despite having a test tomrrow , they are still watching TV now
NN
0
8 tháng 3 2022
Bài 11:
a: x/5=2/10
=>x/5=1/5
hay x=1
b: x/-3=-5/15
=>x/3=1/3
hay x=1