Answer : ![FCH_{2}CH_{2}F](https://tex.z-dn.net/?f=%20FCH_%7B2%7DCH_%7B2%7DF)
Explanation : In the molecule of
the hydrogen bonding forces tend to resist any phase transition form liquid state to gaseous phase, and these hydrogen bonding forces are greater usually when the hydrogen is bound to an electronegative atom like chlorine, fluorine,oxygen,etc. This then lowers the viscosity of the compound.
Answer:
option b is correct
Explanation:
Taking the Van't Hoff equation
d ln Keq / dT = ΔH/(RT²)
then
Keq increases with increasing temperature (d ln Keq / dT>0) when ΔH>0 and decreases with increasing temperature (d ln Keq / dT<0) when ΔH<0
if Keq decreases (reactions shift toward reactants) from 7.9×10³ to 0.77 when temperature increases from 298 K to 713 K (d ln Keq / dT<0) → ΔH<0 ( exothermic reaction)
therefore option b is correct
Answer : The correct option is a car's velocity changes from 25 m/s to 20 m/s in 5 seconds.
Explanation :
Acceleration : It is defined as the change in velocity divided by the time.
The formula of Acceleration is,
![Acceleration=\frac{\text{ (final velocity)-(initial velocity)}}{Time}=\frac{\text{ Change in velocity}}{Time}](https://tex.z-dn.net/?f=Acceleration%3D%5Cfrac%7B%5Ctext%7B%20%28final%20velocity%29-%28initial%20velocity%29%7D%7D%7BTime%7D%3D%5Cfrac%7B%5Ctext%7B%20Change%20in%20velocity%7D%7D%7BTime%7D)
So, we can calculate the acceleration only for 2nd option which is a car's velocity changes from 25 m/s to 20 m/s in 5 seconds.
In this option, velocities and time are given.
![Acceleration=\frac{(25m/s)-(20m/s)}{5s}=1m/s^2](https://tex.z-dn.net/?f=Acceleration%3D%5Cfrac%7B%2825m%2Fs%29-%2820m%2Fs%29%7D%7B5s%7D%3D1m%2Fs%5E2)
In all the other options, the velocity and time are not given. So, we can not calculate the acceleration.
Hence, the correct option is a car's velocity changes from 25 m/s to 20 m/s in 5 seconds.
Most likely White or another color that appears "bright" to us, such as gold, silver, yellow, pink, or sometimes green. Hope it helped!
<span>they are stratospheric ozone depleters, these are chemicals that destroy the ozone in the stratosphere. These include chlorofluorocarbons (CFCs), halons, compounds with cholrine or bromine.</span>