C Hoạt động luyện tập

1. Chọn từ/ cụm từ thích hợp cho trong ngoặc đơn để điền vào chỗ trống trong các câu dưới đây.  (đơn chất; hợp chất; kí hiệu hóa học; nguyên tố hóa học; phân tử; nguyên tử; hạt nhân; nguyên tử khối)

Đơn chất tạo nên từ một.....(1).....nên công thức hóa học của đơn chất chỉ gồm một.....(2)...... Còn.....(3).....tạo nên từ hai, ba.....(4)..... nên công thức hóa học của hợp chất gồm hai, ba,.....(5)...... Chỉ số ghi ở chân mỗi kí hiệu hóa học, bằng số.....(6).....của mỗi nguyên tố có trong một.....(7).....của chất.

2. Dùng các chữ số, kí hiệu và công thức hóa học để diễn tả các ý sau:

a, Hai nguyên tử oxi.

b, Ba phân tử canxi hidroxit.

c, Bảy phân tử amoniac

3. Hãy xác định hóa trị của mỗi nguyên tố trong các hợp chất sau đây;

a, HBr, H₂S, CH₄.

b, Fe₂O₃, CuO, Ag₂O.

Điền vào chỗ trống với từ thích hợp để hoàn thành câu dùng các từ cho sẵn dưới đây:

1.      She uses her bottle collection to __________ her house. It looks so beautiful.

2.      I really love this____________of rice. It is decorated with colorful patterns.

3.      It usually takes two weeks to ____________one carved egg-shell.

4.      My younger brother likes playing with_______________. He usually makes lot of animals such as buffaloes, tigers, and ducks from it.

5.      Nick and I___________to go to the supermarket this afternoon? Would you like to join us?

6.      My father sometimes______________  his carved egg-shells at the local art gallery and museum. Everyone seems to be very interesting with his work.

7.      My mother usually arranges flowers with this ____________. It’s her favorite one.

8.      I am reading a book about various animals in __________

9.      Nick usually makes hand-made ____________to give me on my birthdays.

10.   The____________of this carved egg-shell takes about two weeks.

11.   I really like the____________of the book cover. It looks attractive.

12.   It’s                                to go surfing.

13.   My English teacher introduced himself __________and began his lesson.

14.   Collect as many pictures as possible, then glue them together. Finally, show and describe your ________to your class.

15.   My sister eats healthily and does exercise  regularly to___________

16.  I usually help my mother sweep _________ in the front yard every morning.

Điền vào chỗ trống với từ thích hợp để hoàn thành câu dùng các từ cho sẵn dưới đây:

1.      She uses her bottle collection to __________ her house. It looks so beautiful.

2.      I really love this                                of rice. It is decorated with colorful patterns.

3.      It usually takes two weeks to                                one carved egg-shell.

4.      My younger brother likes playing with                                                                                              _. He usually makes lot of animals such as buffaloes, tigers, and ducks from it.

5.      Nick and I                                to go to the supermarket this afternoon? Would you like to join us?

6.      My father sometimes                                his carved egg-shells at the local art gallery and museum. Everyone seems to be very interesting with his work.

7.      My mother usually arranges flowers with this                  _. It’s her favorite one.

8.      I am reading a book about various animals in                              _.

9.      Nick usually makes hand-made                                to give me on my birthdays.

10.   The                                of this carved egg-shell takes about two weeks.

11.   I really like the                             _ of the book cover. It looks attractive.

12.   It’s                                to go surfing.

13.   My English teacher introduced himself                                and began his lesson.

14.   Collect as many pictures as possible, then glue them together. Finally, show and describe your             to your class.

15.   My sister eats healthily and does exercise  regularly to                                                                                                              .

16.  

I usually help my mother sweep                                in the front yard every morning.