Cho các chất sau, chất nào tác dụng với H2, O2. Viết PTHH? Gọi tên và phân loại các sản phẩm phản ứng.O2, K, Mg, MgO, Al, H2, Al2O3, S, C2H6, P, Fe, CuO, C4H10.
BT2:Cho các chất sau, chất nào tác dụng với H2O. Viết PTHH?Fe2O3, NaOH, P2O5, K, P2O5, Na2O, H3O4, BaO, K2O, Ba, Ca, SO3.

Put the words into the correct order to make meaningful sentences
1, the waste/ the lake from/ has polluted/ the factory/.
2, our environmental project/ I've/ an ideal/ come up with/ about/.

Điện phân a(g) nước thu đc 13,44 lít hỗn hợp khí
Tính a

Cho 0,3 mol nhôm phản ứng với 0,6 mol O2
a, Chất nào dư ?
b,m các chất sau phản ứng

Viết đoạn văn tổng phân hợp khoảng 12 câu làm rõ chị Dậu trong đoạn trích tức nước vỡ bờ là người có tình yêu thương chồng và có sức phản kháng mạnh mẽ , trong đó giá sử dụng một thán từ bộc lộ cảm xúc và một câu ghép

Phân tích đa thức thành nhân tử
a, x^2(x-1)+y^2(1-x)
b,2x^2-2xy+5x-5y
c,2x^2-5x-3

Choose the sentence that is closest in meaning to the original sentence: Teenagers act more violently these days than in the past. *
Teenagers acted less violently in the past than these days.
Teenagers acted less violent in the past than these days.
Teenagers act less violently in the past than these days.
Teenagers acted more violently in the past than these days.
Choose the sentence that is closest in meaning to the original sentence: Linh is the most intelligent in my group. *
Linh is more intelligent than no one in my group.
No one in my group is less intelligent than Linh.
Linh is very intelligent in my group.
No one in my group is as intelligent as Linh.
Choose the sentence that is closest in meaning to the original sentence: Huong Pagoda Festival attracts a lot of Vietnamese people and is popular with foreigners too. *
Huong Pagoda Festival attracts a lot of Vietnamese people; moreover, it is popular with foreigners.
Huong Pagoda Festival attracts a lot of Vietnamese people because it is popular with foreigners.
It is popular with foreigners; however, Huong Pagoda Festival attracts a lot of Vietnamese people.
Huong Pagoda Festival attracts a lot of Vietnamese people although it is popular with foreigners.
Choose the sentence that is closest in meaning to the original sentence: My grandfather is very old. He is still young at heart. *
Despite my grandfather is very old, he is still young at heart.
Because my grandfather is very old, he is still young at heart.
Although my grandfather is very old, he is still young at heart.
My grandfather is very old, so he is still young at heart.
Choose the sentence that is closest in meaning to the original sentence: Tom gets a lot of money. He works hard. *
Although Tom gets a lot of money, he works hard.
Tom gets a lot of money although he works hard.
Tom gets a lot of money, but he works hard.
Tom gets a lot of money because he works hard.

Choose the words which has a different stress pattern from the others: *
recommendation
commemoration
vegetarian
socialization
Choose the words which has a different stress pattern from the others: *
attention
magician
generation
opinion
Choose the word whose underlined part is pronounced differently from that of the others: *
Hình ảnh không có chú thích
procession
ceremony
celebration
recommend
Choose the word whose underlined part is pronounced differently from that of the others: *
Hình ảnh không có chú thích
addicted
provide
ethnic
carnival

x^4-10x^2-9 ÷ x^2-2x-3

Choose the word whose main stress is different from that of the others: *
diverse
paddy
peaceful
ethnic
Choose the word whose main stress is different from that of the others: *
majority
nomadic
cultural
traditional

Phân tích đa thức x^2+3y+xy+3x thành nhân tử

Tính giá trị của biểu thức 5a2 – 5ax – 7a + 7x với a = 98; x = –2

Giá trị của biểu thức $5x^2-5ax-7a+7x$ với a = 98; x = –2 là:

A. 48300                  B. 48400          C. 48600          D.48800

Câu 37: Cho hình chữ nhật ABCD. Lấy điểm E trên đường chéo BD, trên tia CE lấy điểm F sao cho EF = CE. Từ F kẻ FG ^AB (G ÎAB) và FH ^AD (H ÎAD). Câu nào sau đây sai?

A. DBEG vuông cân               B. AGFH là hình chữ nhật

C. AF // BD                               D. H, G, E thẳng hàng