Answer:
![\large \boxed{\text{D. 23.34 min}}](https://tex.z-dn.net/?f=%5Clarge%20%5Cboxed%7B%5Ctext%7BD.%2023.34%20min%7D%7D)
Explanation:
1. Find the order of reaction
Use information from the graph to find the order.
If a plot of ln[A] vs time is linear, the reaction is first order and the slope = -k.
2. Find the half-life
![k = \dfrac{\ln2}{ t_{\frac{1}{2}}}\\\\k = \text{-slope} = -(-2.97 \times 10^{-2} \text{ min}^{-1}) =2.97 \times 10^{-2} \text{ min}^{-1} \\ t_{\frac{1}{2}} =\dfrac{\ln 2}{k} = \dfrac{\ln 2}{2.97 \times 10^{-2}\text{ min}^{-1}} =\textbf{23.34 min}\\\\\text{The half-life is $\large \boxed{\textbf{23.34 min}}$}](https://tex.z-dn.net/?f=k%20%3D%20%5Cdfrac%7B%5Cln2%7D%7B%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%7D%5C%5C%5C%5Ck%20%3D%20%5Ctext%7B-slope%7D%20%3D%20-%28-2.97%20%5Ctimes%2010%5E%7B-2%7D%20%5Ctext%7B%20min%7D%5E%7B-1%7D%29%20%3D2.97%20%5Ctimes%2010%5E%7B-2%7D%20%5Ctext%7B%20min%7D%5E%7B-1%7D%20%5C%5C%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%20%3D%5Cdfrac%7B%5Cln%202%7D%7Bk%7D%20%3D%20%5Cdfrac%7B%5Cln%202%7D%7B2.97%20%5Ctimes%2010%5E%7B-2%7D%5Ctext%7B%20min%7D%5E%7B-1%7D%7D%20%3D%5Ctextbf%7B23.34%20min%7D%5C%5C%5C%5C%5Ctext%7BThe%20half-life%20is%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B23.34%20min%7D%7D%24%7D)
Answer:
9.133×10^-6 m
Explanation:
A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 3 x 10^8 m/s.
From the question, the following details were supplied;
Energy of the photon (E) = 4.61×10^−19 J
Speed of light (c) = 2.99×10^8 m/s
Plank's constant (h) = 6.626×10^−34 J⋅s
Wavelength of the photon (λ)= ??? The unknown
From
E=hc/λ
λ= hc/E
Substituting values
λ= 6.626×10^−34 × 2.99×10^8/ 4.61×10^−19
λ= 91.33×10^-7 m
λ= 9.133×10^-6 m
Answer: 0.3
Explanation:
We know that
Ka = [H+] * [A-] / [HA]
And the acid is 15 % dissociated means that
[A-] / [HA] *100 = 15%
So
[A-] / [HA] = 0.15
Then we know that [H+] = [A-] = 2 molar
Replacing we have
Ka = 2 molar * 0.15 = 0.3
Answer:
Hey there
Explanation:
The process where organisms better adapted to their environment tend to survive and produce more offspring is called natural selection. It is one of the points of Darwinism by Charles Darwin.
Hope it helps
<h3>
Answer:</h3>
The higher the hydronium ion concentration of a solution, the <u>lower</u> its pH.
<h3>
Explanation:</h3>
- The pH is the measure of acidity or alkalinity of a substance.
- We calculate pH by using;
pH = -log[H+]
- The lower the pH of a solution the more acidic it is and the higher the pH the more basic or alkaline it is.
- From this relationship, the higher the hydronium ions concentration of a solution the lower the pH and the more acidic a solution is.
For example,
Solution A with a [H₃O+] of 0.003 M will have a pH of
pH = -log 0.003 M
= 2.52
While, a solution B with a [H₃O+] of 0.025 M will have a pH of
pH = -log 0.25 M
= 1.60
Therefore, the higher the concentration of hydronium ion of a solution the lower its pH is.