Đốt cháy hoàn toàn 0,1 mol hỗn hợp gồm $ C{ H _ 4 },{ C _ 2 }{ H _ 4 },{ C _ 4 }{ H _{10}} $ thu được 0,14 mol $ C{ O _ 2 } $ và 0,23 mol $ { H _ 2 }O $ . Xác định số mol ankan và anken trong hỗn hợp là
A.0,01 và 0,09
B.0,08 và 0,02
C.0,02 và 0,08
D.0,09 và 0,01

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
A(n) _______ is a person’s opinion about a subject.
A.footstep
B.family member
C.viewpoint
D.generation gap

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
He doesn’t like the way his parents __________ him. He wants to be independent.
A.look
B.care
C.bring
D.treat

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Lucky you! You must be so happy to have such a great _______ with your parents.
A.habit
B.relationship
C.thinking
D.routine

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ normally happen when people don’t understand each other well.
A.Thoughts
B.Conflicts
C.Decisions
D.Generation gap

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Sometimes, _______ do happen, but our family members sit together and discuss.
A.manners
B.viewpoints
C.conflicts
D.generations

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My grandpa thinks that I ought to _______ a job in a state-owned organization after university.
A.work
B.get
C.bring
D.make

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
She usually helps her mother with household __________ after school.
A.jobs
B.chores
C.works
D.activities

Tìm phát biểu không đúng?
A. $ {{F}_{ph}}=ma. $
B. $ {{F}_{dhmin}}=k(\Delta l-A) $
C. $ {{F}_{dh}}=k.\Delta l $
D. $ {{F}_{dhmax}}=k(\Delta l+A) $

Vật có khối lượng 0,5kg treo vào lò xo có k=80(N/m). Dao động theo phương thẳng đứng với biên độ 5(cm). Gia tốc cực đại của vật là :
A. $ 4\left( m/{{s}^{2}} \right) $
B. $ 10\left( m/{{s}^{2}} \right) $
C. $ 8\left( m/{{s}^{2}} \right) $
D. $ 20\left( m/{{s}^{2}} \right) $