Let's examine the given choices:
V = (4/3)*pi*(r)^3 is the rule to calculate the volume of the sphere
V = (1/3)*pi*(r)^2*h is the rule to calculate the volume of the cone
V = s^3 is the rule to calculate volume of the cube
V = pi*(r)^2*h is the rule to calculate volume of the cylinder
Now, the ball can be treated as a perfect sphere, therefore, to calculate its volume we will use the rule of the volume of sphere.
Based on this, the correct choice is:
V = (4/3)*pi*(r)^3
<u>Answer:</u> The half life of the reaction is 593.8 seconds
<u>Explanation:</u>
We are given:
Rate constant = ![0.0016mol/L.s](https://tex.z-dn.net/?f=0.0016mol%2FL.s)
The formula for determining the unit of 'k' is:
![\text{Unit}=\frac{(Concentration)^{1-n}}{Time}](https://tex.z-dn.net/?f=%5Ctext%7BUnit%7D%3D%5Cfrac%7B%28Concentration%29%5E%7B1-n%7D%7D%7BTime%7D)
where, n = order of reaction
The unit of concentration is, M or mole/L
The unit of time is, second or 's'
Evaluating the value of 'n' from above equation:
![mol.L^{-1}s^{-1}=\frac{(mol/L)^{1-n}}{s}\\\\n=0](https://tex.z-dn.net/?f=mol.L%5E%7B-1%7Ds%5E%7B-1%7D%3D%5Cfrac%7B%28mol%2FL%29%5E%7B1-n%7D%7D%7Bs%7D%5C%5C%5C%5Cn%3D0)
The reaction is zero order reaction.
The equation used to calculate half life for zero order kinetics:
![t_{1/2}=\frac{[A_o]}{2k}](https://tex.z-dn.net/?f=t_%7B1%2F2%7D%3D%5Cfrac%7B%5BA_o%5D%7D%7B2k%7D)
where,
k = Rate constant = ![0.0016mol/L.s](https://tex.z-dn.net/?f=0.0016mol%2FL.s)
= initial concentration = 1.90 mol/L
Putting values in above equation, we get:
![t_{1/2}=\frac{1.90mol/L}{2\times 0.0016mol/L.s}=593.8s](https://tex.z-dn.net/?f=t_%7B1%2F2%7D%3D%5Cfrac%7B1.90mol%2FL%7D%7B2%5Ctimes%200.0016mol%2FL.s%7D%3D593.8s)
Hence, the half life of the reaction is 593.8 seconds
The explosion of the firework produces gases, and their electrons are excited. As they return to their ground state, they emit colored light according to the chemicals used: blues from copper compounds, yellow from sulfur, green from barium, and so on.
Answer:
12.a 2:3:1
b 2:2:1
Explanation:
sorry I don't have much time.
all I could now