nnhongtram

2 năm trước

Nhận biết hiện tượng xảy ra giữa Zn và dd CuCl2

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huutin202

2 năm trước

$Zn+CuCl_2→Cu+ZnCl_2$

-Giải thích: Zn đứng trước Cu trong dãy hoạt động hóa học

-Hiện tượng: Zn đẩy Cu ra khỏi muối

giangnth

2 năm trước

Đáp án:

như dưới

Giải thích các bước giải:

PTHH: Zn + CuCl2 => ZnCl2 + Cu

Hiện tượng:

- Kim loại Zn tan dần, có một lớp kim loại màu đỏ đồng bám trên thanh Zn

- dung dịch màu xanh nhạt dần

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Nhận biết hiện tượng xảy ra giữa Zn và dd CuCl2

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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Nhận biết hiện tượng xảy ra giữa Zn và dd CuCl2

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

Choose the best answer.We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.

Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.