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1. A. this B. think C. thank D. thieves
2. A. gather B. bathe C. birthday D. weather
3. A. tooth B. breathe C. through D. earth
4. A. thirty B. than C. therefore D. those
5. A. brother B. breath C. either D. clothes
6. A. hate B. air C. chair D. hair
7. A. prepare B. carry C. share D. fair
8. A. racket B. skateboard C. games D. player
9. A. favorite B. animal C. channel D. programme
10. A. cold B. photo C. continent D. poster
11. A. city B. capital C. nice D. excite
12. A. tomorrow B. tower C. crowd D. around
13. A. postcard B. come C. home D. so
14. A. programme B. sport C. most D. show
15. A. favorite B. night C. fine D. high
1, A. the B. there C. think D. they
2, chịu
3, A. when B. where C. detective D. best
4, A. clumsy B. cute C. just D. but
5, A. weather B. newsreader C. teaching D. repeat
6, A. game B. relax C. national D. channel
1. C
2. D (nếu gạch chữ "th")
3. C (nếu gạch chân chữ "e" đầu của từ detective)
4. B
5. A
6. A
Phonetics: Choose the word whose underlined part is pronounced differently:
1. A. tooth B. clothing C. bath D. both
2. A. gather B. monthly C. father D. brother
3. A. though B. thank C. through D. thin
4. A. clip B. give C. twice D. stupid
5. A. studio B. documentary C. cute D. stupid
a)\(Fe+CuSO4-->Cu+FeSO4\)
b) \(n_{Fe}=\frac{1,96}{56}=0,035\left(mol\right)\)
\(m_{CuSO4}=\frac{100.10}{100}=10\left(g\right)\)
\(n_{CuSO4}=\frac{10}{160}=0,0625\left(mol\right)\)
Do \(0,036>0,0625\Leftrightarrow\) \(n_{Fe}< n_{CuSO4}\)
=> CuSO4 dư.Tính theo n chất hết (Fe)
Chất rắn B là Cu
\(n_{Cu}=n_{Fe}=0,035\left(mol\right)\)
\(m_{Cu}=0,035.64=2,24\left(g\right)\)
c) m dd A =\(m_{Fe}+m_{ddCuSO4}-m_{Cu}=1,96+100-2,24=99,72\left(g\right)\)
dd A là FeSO4 và CuSO4 dư
\(n_{FeSO4}=n_{Fe}=0,035\left(mol\right)\)
\(m_{FeSO4}=0,035.152=5,32\left(g\right)\)
\(C\%_{FeSO4}=\frac{5,32}{99,72}.100\%=5,33\%\)
\(n_{CuSO4}=n_{Fe}=0,035\left(mol\right)\)
\(n_{CuSO4}dư=0,0625-0,035=0,0275\left(mol\right)\)
\(m_{CuSO4}dư=0,0275.160=4,4\left(g\right)\)
\(C\%_{CuSO4}dư=\frac{4,4}{99,72}.100\%=4,41\%\)
1. A. there B. theatre C. earth D. anything
2. A. anything B. them C. neither D. weather
3. A. think B. than C. Thursday D. third
4. A. father B. they C. the D. thick (thick chứ sao lại thich nhỉ?)
5. A. than B. thin C. through D. month
Choose the word that has the underlined part pronounced differently for the rest.
1. a. this b. think c. thank d.thieves
2. a. gather b. bathe c. birthday d. weather
3. a. tooth b. breathe c. through d. earth
4. a. thirty b. than c. therefore d. those
5. a. mouth b. Thursday c. nothing d.worthy
1. a.this
2. c.birthday
3. b.breathe
4. a.thirty
5. d.worthy