Answer:
False
Explanation:
When electrons move from lower to higher electron energy level they absorb the energy. When they move from higher to lower energy level they emit energy.
Answer:
Mass = 96 g
Explanation:
Given data:
Mass of oxygen required = ?
mass of Al = 110 g
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 110 g/ 27 g/mol
Number of moles = 4 mol
Now we will compare the moles of Al and oxygen.
Al : O₂
4 : 3
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 3 mol × 32 g/mol
Mass = 96 g
This is an incomplete question, here is a complete question.
A certain first-order reaction has a rate constant of 5.50 × 10⁻³ s⁻¹. How long will it take for the reactant concentration to drop to 1/8 of its initial value?
Answer : The time taken will be, 378.1 s
Explanation :
Expression for rate law for first order kinetics is given by:
![t=\frac{2.303}{k}\log\frac{a}{a-x}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B2.303%7D%7Bk%7D%5Clog%5Cfrac%7Ba%7D%7Ba-x%7D)
where,
k = rate constant = ![5.50\times 10^{-3}s^{-1}](https://tex.z-dn.net/?f=5.50%5Ctimes%2010%5E%7B-3%7Ds%5E%7B-1%7D)
t = time passed by the sample = ?
a = let initial amount of the reactant = x
a - x = amount left after decay process = ![\frac{x}{8}](https://tex.z-dn.net/?f=%5Cfrac%7Bx%7D%7B8%7D)
Now put all the given values in above equation, we get
![t=\frac{2.303}{5.50\times 10^{-3}}\log\frac{x}{(\frac{x}{8})}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B2.303%7D%7B5.50%5Ctimes%2010%5E%7B-3%7D%7D%5Clog%5Cfrac%7Bx%7D%7B%28%5Cfrac%7Bx%7D%7B8%7D%29%7D)
![t=378.1s](https://tex.z-dn.net/?f=t%3D378.1s)
Thus, the time taken will be, 378.1 s
Answer:
1,2 dichlorobenzene was used as the solvent for the diels alder reaction: <em>because the co elimination part of the reaction needs high temp and a high boiling point solvent such as 1,2 dichlorobenzene</em>
Explanation:
Diels-Alder Reaction is a useful synthetic tool to prepare cyclohexane rings. It is a process, which occurs in a single step that consists of a cyclic redistribution of its electrons. The two reagents are bond together through a cyclic transition state in which the two new C-C bonds are formed at the same time. For this to occur, most of the time, it is necessary a high temperature and high-pressure conditions. Since 1,2 dichlorobenzene has a boiling point of 180ºC is a good solvent for this type of reactions.
The problem ask to calculate of find the atmospheric pressure of water having a boiling point of 81 degree. Base on my calculation i came up with an answer of 292 mm HG. I hope you are satisfied with my answer and feel free to ask for more if you have clarification and question