Pre-test Bài thực hành 4
Quiz
•
Chemistry
•
10th Grade - University
•
Easy
Phạm Thúy
Used 4+ times
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19 questions
Show all answers
1.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
How do we avoid generating amorphous silver in a silver mirror test?
Don't shake the test tube.
Heat the test tube directly over the flame.
Heat the test tube in a water bath.
Shake the test tube vigorously.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How to regain silver from a silver mirror test?
Using the nitric acid solution.
Using the ammonia solution.
Using the sulfuric acid solution.
Using the sodium hydroxide solution.
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Hiện tượng nào sau đây có thể thu được khi dùng dư dung dịch CuSO4 trong thí nghiệm aldehyde phản ứng với Cu(OH)2/NaOH?
Có kết tủa đen.
Có kết tủa xanh đậm.
Có khí thoát ra.
Có kết tủa trắng.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which test is used for detection of methyl ketones?
Tollen’s test.
Iodoform test.
Silver mirror test.
Fehling’s test.
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What happens in iodoform test of acetone?
The solution turns into a cloudy yellow solution or a yellow precipitate.
The solution turns into a clear, yellow solution.
The solution turns into an orange solution with no precipitate.
The solution turns into a colorless solution.
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Làm thế nào để hạn chế sự than hóa các chất phản ứng khi thực hiện phản ứng este hóa?
Chỉ dùng một lượng nhỏ sulfuric acid.
Đun nóng nhẹ hoặc đun cách thủy hỗn hợp phản ứng.
Thay sulfuric acid đặc bằng nitric acid.
Ngâm hỗn hợp phản ứng trong nước đá.
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What chemicals are used to check whether the starch has been completely hydrolyzed or not?
Silver nitrate in ammonia solution.
Iodine.
Copper(II) hydroxide.
Sodium hydroxide.
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