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kiem

Authored by Thị Trà Vinh Trần

Chemistry

12th Grade

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6 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Cho sắt phản ứng với dung dịch HNO3 đặc, nóng thu được một chất khí màu nâu đỏ. Chất khí đó là

N2

NH3.

NO2.

N2O

2.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

i am a horder

truE

trUe

tRue

FALSE

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

29. Copper

Co

Cu

C

Cp

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following represents the the unit of k in first order reaction?

s1s^{-1}

ss

sM\frac{s}{M}

5.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

metyl propionat

C2H5COOCH3
C6H5OH
C3H7COOH(hệ thống)
C2H5COOC4H9
CH3OH(thay thế)

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

 ln[A]t  ln[A]0 = kt\ln\left[A\right]_{t\ }-\ \ln\left[A\right]_{0\ }=\ -kt  



Following the basic rule of logarithm quotient, which of the following correctly expresses the equation above?

 ln[A]t [A]0 = kt\ln\left[A\right]_{t\ }\left[A\right]_{0\ }=\ -kt  

 ln [A]t[A]0 = kt\ln\ \frac{\left[A\right]_t}{\left[A\right]_0}\ =\ -kt  

 ln[A]t = ln[A]0 kt\ln\left[A\right]_{t\ }=\ \ln\left[A\right]_{0\ }-kt  

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