Avogadro's number; it describes the number of representative particles in one mole of a substance. Avogadro's number is. 6.022×10^23mol
glass copper water
absorbing a given of amount of heat
Answer:
2667 tires are needed to meet the demand of ten homes for one year.
Explanation:
According to the Second Law of Thermodynamics, only a part of generated energy when tires are burned can be utilized due to irreversibilities associated with finite temperature differences. The energy from a tire that can be transformed into electricity (
), measured in kilowatt-hours, is estimated by definition of efficiency:
![E_{out} = \eta \cdot E_{in}](https://tex.z-dn.net/?f=E_%7Bout%7D%20%3D%20%5Ceta%20%5Ccdot%20E_%7Bin%7D)
Where:
- Efficiency, dimensionless.
- Energy liberated by burning, measured in kilowatt-hours.
Given that
and
, the amount of energy per year generated by a tire is:
![E_{out} = 0.5\cdot (75\,kWh)](https://tex.z-dn.net/?f=E_%7Bout%7D%20%3D%200.5%5Ccdot%20%2875%5C%2CkWh%29)
![E_{out} = 37.5\,kWh](https://tex.z-dn.net/?f=E_%7Bout%7D%20%3D%2037.5%5C%2CkWh)
Now, the amount of tires needed to meet the demand of then homes for one year is:
![n = \frac{(10\,homes)\cdot \left(10000\,\frac{kWh}{home} \right)}{37.5\,\frac{kWh}{tire} }](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B%2810%5C%2Chomes%29%5Ccdot%20%5Cleft%2810000%5C%2C%5Cfrac%7BkWh%7D%7Bhome%7D%20%5Cright%29%7D%7B37.5%5C%2C%5Cfrac%7BkWh%7D%7Btire%7D%20%7D)
![n = 2666.667\,tires](https://tex.z-dn.net/?f=n%20%3D%202666.667%5C%2Ctires)
2667 tires are needed to meet the demand of ten homes for one year.
Answer: solid
Explanation: Chemical reactions are those which involve rearrangement of atoms.
Chemical changes are accompanied by following changes:
1) Absorption or release of heat
2) Change in color
3) Formation of gas bubbles
4) Formation of a solid product called as precipitate
Example of formation of precipitate or solid in chemical reaction:![2AgNO_3(aq)+BaCl_2(aq)\rightarrow 2AgCl(s)+Ba(NO_3)_2(aq)](https://tex.z-dn.net/?f=2AgNO_3%28aq%29%2BBaCl_2%28aq%29%5Crightarrow%202AgCl%28s%29%2BBa%28NO_3%29_2%28aq%29)
The relationship between molecular velocities and temperature is a direct relationship. Basically their relationship is directly proportional