nêu phương pháp tách nhôm và đồng ra khỏi hỗn hợp biết nhiệt độ Đồng=660 độ,nhiệt độ nhôm =1084 độ
giúp mình câu này với ? Hỗn hợp E gồm X, Y, Z đều là este no, mạch hở (trong đó X, Y đều là este đơn chức và (MX < MY < MZ). Thủy phân hoàn toàn 0,16 mol E bằng lượng vừa đủ 220 ml dung dịch KOH 1M, thu được hỗn hợp F gồm hai muối của axit cacboxylic và 10,96 gam hỗn hợp T gồm hai ancol kế tiếp nhau trong dãy đồng đẳng. Mặt khác, đốt cháy hoàn toàn 0,08 mol E cần dùng 0,595 mol O2, thu được CO2 và H2O. Phần trăm khối lượng của Z có trong E là A. 25,93%. B. 39,69%. C. 45,39%. D. 59,53%
Question 16 refers to section A on page 3.
Question 16: What is the main purpose of section A?
A. to stress the importance of environmental awareness
B. to point out the benefits of recycling
C. to invite students and parents/guardians to a meeting
D. to announce a planned recycling scheme
Questions 17-18 refer to section B on page 3.
Question 17: What do we learn about the ballet?
A. It’s only performed during the Christmas holidays.
B. There will not be many performances.
C. It will be performed at Greenhill School.
D. It’s not suitable for older children.
Question 18: Why are people asked to fill out the tear-off portion at the end of the letter? A. in order to get better seats
B. so that the school secretary won’t be disappointed
C. to inform the school about which performance time they prefer D. so the school knows how many tickets to book
Questions 19-20 refer to section C on page 3.
Question 19: What type of person would a suitable candidate be?
A. cooperative B. introverted C. bossy D. competitive
Question 20: In the third sentence of the second paragraph, what does They refer to?
A. school trips B. staff members
C. extra-curricular projects D. applicants
Questions 21-23 refer to section D on page 3.
Question 21: Why does the center need volunteers now?
A. It is caring for more turtles than ever before.
B. Most of its turtles are sick or injured.
C. It is experiencing an increase in visitor numbers.
D. The existing volunteers are undergoing training.
Question 22: Why does the leaflet mention sponsorship?
A. to show that some school children have little free time
B. to highlight that the center is in need of money
C. to present an alternative form of participation
D. to encourage classmates to volunteer together
Question 23: What does the section tell us about the turtles the center has?
A. The vets check their progress once a week.
B. They are placed in the sea when they have recovered.
C. Caring for them is not at all cheap.
D. Their progress can be followed on the center’s website.
Questions 24-25 refer to sections A, B, C and D.
Question 24: Which sections mention activities that could form part of Greenhill School’s extra-curricular program?
A. sections A, B and C B. sections A, B and D C. sections B, C and D D. all sections
Question 25: What would a teacher at Greenhill school NOT be expected to do?
A. accompany children to theatrical performances
B. volunteer to help at the turtle center
C. attend activities and meetings after school hours
D. organize a tree-planting day in the school ground
Read the following sections and mark the letter A, B, C, or D on the answer sheet to indicate the correct answer to each of the questions from 16 to 25.
English Teacher Needed
We are looking for a well-qualified and experienced
Staff and Parents
English teacher to head our dynamic English Department. The
Reginald Bains, Principal
applicant must possess leadership qualities, but also the ability
to work alongside others, The newly appointed member of
In an effort to raise our students'
staff will be expected to head a group of teachers in a
environmental awareness, I have proposed
that we begin a recycling program at the
Our school program is varied and progressive. Applicants
school. A meeting has therefore been
must be willing to get involved in all school activities,
arranged for Friday, Nov 29 (7:00 pm) to
sometimes at weekends, and organize extra-curricular projects
discuss certain issues with staff and parents.
including volunteer programs and school trips. They should be
Points to be discussed are:
aware that Greenhill School expects all staff members to
• When the recycling program will begin
contribute new thoughts and ideas regarding the expansion of
• How it will be organized
our existing school program.
• What students and staff are expected to do
Over the years our school has made outstanding progress in
• How parents/guardians can contribute
this field and has also achieved an excellent academic
• A general discussion about the benefits of
reputation, so employing the right applicant is vital.
If you think you could do this position justice, please fax or
A full report of the meeting and an
email your CV to:
information leaflet will be sent to
parents/guardians at a later date with further
c/o Greenhill School,
details about the recycling program.
Potters Avenue, Framworth.
Fax: 44418 9721
A Winter Theater Evening
Experience the wonderful world of ballet
and the music of Tchaikovsky
On December 19 and 20, the weekend before Christmas, the Vonereva Ballet Company will be dancing The Nutcracker at the Central City Theater. With its spectacular Waltz of the Snowflakes scene, The Nutcracker is always a favorite during the Chrismas period. It is said to be one of the most enioyable ballet extravaganzas for all ages, and especially children, due to its Christmas story plot, dancing toys and fabulous costumes.
Performance times will be announced next week but, in the meantime, please fill out the tear- off portion at the bottom of this letter if you are interested. Children who want to attend, but whose parents/guardians aren't able to, will be accompanied by Mrs Carlson, head of the Science Department. Due to the limited number of performances, we must book soon so as to avoid disappointment. Tickets will not exceed $10, but the bigger the group, the cheaper the tickets.
Greenhill School's Winter Theater Evening The Nutcracker
Please complete ond return to the school secretary
Name of family ___________________________
We would like _____ tickets
Signature of parent/guardian ___________________
The Bayside Turtle Rehab Center
We are appealing for school children to work as volunteers at weekends. Presently, there are over 35 turtles in our care, a number which has broken all previous records, and the work involved and care they need is keeping the permanent members of staff at the center very busy.
Volunteers would be expected to do menial tasks such as cleaning, welcoming visitors, showing them round and generally
being on hand to help our trained vets when necessary. Most of our turtles are sick or have been injured, and therefore require a lot of tender loving care and attention from the vets,
If you have no time available but would like to help, you can sponsor a turtle for a small fee ($5 per month) and follow its rehabilitation and progress on a weekly basis, eventually taking part in its return to its natural environment. Perhaps you would like to do this together with a classmate.
So come along and visit us and our turtles. We'd all love to see you. We are located at Marina B2 and our phone number is 417 3831. You can also learn more about us online at baysideturtlecenter.com.
Mary Robinson – Director of Bayside Turtle Rehad Center