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tìm từ phát âm khác:
1. A. window B. flow C. how D. know ở chữ ow
2. A. recycle B. thirsty C. hungry D. finally ở chữ y
3. A. engineer B. geography C. language D. great ở chữ g
4. A. lettuce B. tube C. music D. use ở chữ u
1. A. thirsty B. tooth C. thick D. mother ð
2. A. further - ð B. mouth C. thin D. thumb
3. A. father B. thick - θ C. there D. them
4. A. gather B. together C. birthday - θ D. their
5. A. rather B. theatre - θ C. weather D. those
6. A. thunder B. thirteen C. three D. there - ð
7. A. Thursday B. both C. weather - ð D. anything
1. A. thirsty B. tooth C. thick D. mother ð
2. A. further - ð B. mouth C. thin D. thumb
3. A. father B. thick - θ C. there D. them
4. A. gather B. together C. birthday - θ D. their
5. A. rather B. theatre - θ C. weather D. those
6. A. thunder B. thirteen C. three D. there - ð
7. A. Thursday B. both C. weather - ð D. anything
khác nhau àk
1 A. leather B. that C. theatre D. then
2 A. nothing B. gather C. method D. death
3 A. something B. brother C. them D. weather
4 A. those B. there C. thank D. without
5 A. soothe B. south C. thick D. athlete
6 A. healthy B. northern C. thirsty D. mouth
7 A. this B. these C. them D. earth
8 A. this B. feather C. smooth D. south
9 A. think B. month C. everything D. clothing
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. Odd one out
1. A. cottage B. apartment C. washing machine D. villa
2. A. microwave B. dishwasher C. fridge D. stilt house
3. A. wireless TV B. houseboat C. palace D. skyscraper
4. A. village B. balcony C. city D. countryside
5. A. bedroom B. computer C. living room D. kitchen
6. A. clock B. hi-fi robot C. microwave D. attic
7. A. bathroom B. bowl C. spoon D. plate
8. A. table B. armchair C. cottage D. stool
9. A. chopstick B. pot C. fork D. toilet
10.A. door B. garden C. window D. roof
1. A. reduced B. realized C. saved D. compared
2. A. scheme B. mechanic C. machine D. chemistry
3. A. gather B. ethnic C. there D. although
4. A. sewage B. save C. treasure D. campus
5. A. plow B. know C. flow D. window
Trả lời
1.A
2.C
3.B
4.C
5.A
1 2D 3B 4