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Ai làm hộ em với ạ e cần gấp ạ
15 tháng 6 2021
41.C
42.B
43.A
44.C
45.D
46. MK KO BIẾT
47.C
48.B
49. MK KO BIẾT
50.A
❤ HOK TT ❤
11 tháng 9 2023
I. Write sentences with the cues given
1. Mai / usually / listen / K - pop music / free time.
→ Mai usually listens to K-pop music in her free time.
2. when / I / be / a child / I / enjoy / play / computer games
→ When I was a child, I enjoyed playing computer games.
3. my father / spend / most / spare time / look after / the garden
→ My father spends most of his spare time looking after the garden.
4. watching TV / most / popular / leisure activity / Britain ?
→ Is watching TV the most popular leisure activity in Britain?
5. many teenagers / addicted / the Internet / computer games
→ Many teenagers are addicted to the Internet and computer games.
6. she / get / hooked / the medical drama / after / watch / the first people
→ She got hooked on the medical drama after watching the first episode.
7. most / my friends / prefer / play sports / to / surf the net
→ Most of my friends prefer to play sports rather than surf the net.
8. today's world / teenagers / rely / technology / more / the past
→ In today's world, teenagers rely on technology more than in the past
II. Write the second sentences so that it has a similar meaning to the first one
1. It takes us more than two hours to see the film " Avatar "
→ The film " Avatar " requires more than two hours of our time to watch.
2. She likes to hang out with friends on Saturday evening
→ She's interested in socializing with friends on Saturday evening
Mn làm hết hộ e với ạ
18 tháng 8 2021
Bài 4:
nK= 7,8/39=0,2(mol)
PTHH: 2 K + 2 H2O -> 2 KOH + H2
nKOH=nK=0,2(mol)
=> mKOH=0,2.56=11,2(g)
nH2=1/2 . nK=1/2 . 0,2=0,1(mol)
=>mH2=0,1.2=0,2(g)
mddKOH= mK + mH2O - mH2= 7,8+ 192,4 - 0,2= 200(g)
=> C%ddKOH= (11,2/200).100=5,6%
Chúc em học tốt!
18 tháng 8 2021
Bài 5:
nBa=27,4/137=0,2(mol)
a) PTHH: Ba + 2 H2O -> Ba(OH)2 + H2
b) nB=nH2=nBa(OH)2=nBa=0,2(mol)
=>V(B,đktc)=V(H2,đktc)=0,2.22,4=4,48(l)
c) mBa(OH)2= 171. 0,2= 34,2(g)
=> mddBa(OH)2= 34,2: 8%= 427,5(g)
=> mH2O = mBa(OH)2 + mH2 - mBa= 427,5+ 0,2. 2 - 27,4= 400,5(g)
=> m=400,5(g)
