Approximating 7 to 20 kilometers
Hope this helps
Answer:
Newton's Second Law
Explanation:
Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
(I'm going to assume this is an option, but please let me know if it's not!)
The 2,4 and 5 positions are accessible for nitration of 1,3‑dimethylbenzene. The final product is shown in the image attached.
<h3>What is nitration?</h3>
Nitration is a type of reaction in which the nitro group (-NO2) is introduced to an aromatic ring. We have to note that in the compound 1,3‑dimethylbenzene, the 2,4 and 5 positions are accessible for nitration as shown.
Hence, the nitration of 1,3‑dimethylbenzene occurs as shown in the image attached with the compound shown being the major product.
Learn more about nitration: brainly.com/question/5346392
Answer: 958 kJ heat is released when 0.211 mol of 
reacts with excess oxygen.
Explanation:
The balanced chemical reaction is,
The expression for enthalpy change is,
![\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5Csum%20%5Bn%5Ctimes%20%5CDelta%20H_f%28product%29%5D-%5Csum%20%5Bn%5Ctimes%20%5CDelta%20H_f%28reactant%29%5D)
![\Delta H=[(n_{B_2H_3}\times \Delta H_{B_2H_3})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{B_5H_9}\times \Delta H_{B_5H_9})]](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5B%28n_%7BB_2H_3%7D%5Ctimes%20%5CDelta%20H_%7BB_2H_3%7D%29%2B%28n_%7BH_2O%7D%5Ctimes%20%5CDelta%20H_%7BH_2O%7D%29%5D-%5B%28n_%7BO_2%7D%5Ctimes%20%5CDelta%20H_%7BO_2%7D%29%2B%28n_%7BB_5H_9%7D%5Ctimes%20%5CDelta%20H_%7BB_5H_9%7D%29%5D)
where,
n = number of moles
(as heat of formation of substances in their standard state is zero
Now put all the given values in this expression, we get
![\Delta H=[(5\times -1272)+(9\times -285.5]-[(12\times 0)+(2\times 73.2)]](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5B%285%5Ctimes%20-1272%29%2B%289%5Ctimes%20-285.5%5D-%5B%2812%5Ctimes%200%29%2B%282%5Ctimes%2073.2%29%5D)
Thus 2 moles of release heat = 9075.9 kJ
0.211 moles of release heat =
Answer:
The correct answer is A all chemical bonds are hard to break
Explanation:
The minimum amount of energy that is required to break a chemical bond is known as bond energy.
Different amount of energy is required to break different bonds. For example High amount of energy is required to break covalent bond whereas a low amount of energy is required to break non covalent bonds such as hydrogen bond, hydrophobic interaction,van der waal interaction etc.
