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II. Choose the word having the underlined part pronounced differently in each line.
1. A. how B. powder C. crowd D. know
2. A. hour B. sour C. colour D. our
3. A. orange B. open C. home D. phone
4. A. house B. mouse C. shoulder D. south
5. A. notice B. stone C. motor D. coward
6. A. lot B. open C. clothes D. most
7. A. south B. house C. soul D. noun
8. A. know B. cow C. slow D. show
9. A. how B. show C. follow D. pillow
10. A. close B. knot C. note D. post
11. A. cold B. shop C. sold D. photo
12. A. a cow B. now C. down D. know
13. A. rose B. fond C. code D. stone
14. A. shoulder B. sound C. count D. around
15. A. tower B. owl C. crown D. show
II. Choose the word whose underlined part is pronounced differently from the others . 1.A.bicycle B. exciting C. favorite D. widely
2.A. doctor B. opening C. gold D. poscard
3. A. farther B. earth C. both D. marathon
4.A. fear B. repeat C. idea D. really
5.A.hair B. fare C. prepare D. speaker
III. Choose the word whose underlined part is pronounced differently from the others. 1. A. arrived B. watched C. listened D. played
2. A. arrived B. watched C. stopped D. washed
3.A. they B. month C. father D. brother
4.A. ago B. open C. cold D. come
5. A. married B. called C. played D. rented
6. A. started B. worked C. waited D. wanted
IV. Choose the word whose underlined part is pronounced differently from the others 1. A. needed B. liked C. washed D. hoped
2. A. works B. plays C. wants D. stops
3. A. stayed B. listened C. cooked D. played
4.A. brother B. open C. some D. come
5. A. wanted B. excited C. needed D. bored
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
\(n_{FeSO4}=n_{Fe}=0,035\left(mol\right)\)
\(m_{FeSO4}=0,035.152=5,32\left(g\right)\)
\(C\%_{FeSO4}=\frac{5,32}{99,72}.100\%=5,33\%\)
\(n_{CuSO4}=n_{Fe}=0,035\left(mol\right)\)
\(n_{CuSO4}dư=0,0625-0,035=0,0275\left(mol\right)\)
\(m_{CuSO4}dư=0,0275.160=4,4\left(g\right)\)
\(C\%_{CuSO4}dư=\frac{4,4}{99,72}.100\%=4,41\%\)
TL:
1. D
2. B
3. C
4. A
5. A
6. D
7. B
8. A
Lớp 5 cũng làm dc bài này
1D
2B
3C
4A
5A
6D
7B
8A
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