With a physical change you can actually see it change like ice turning into water, then with a chemical change you can't see it change, although within the molecules themselves they change which makes that possible.
Hope this helps!
The representation that would best explain the properties of the gas fluorine would be a <span>electron dot structure. From this structure, you can see how many electrons are available for bonding since the electrons are the ones responsible for interacting with other atoms. </span>
Answer:
0.088 M.
Explanation:
Assuming that the temperature is 429 K, we can calculate the concentration of NO₂. Kc(429K) = 0.490.
The reaction is:
N₂O₄(g) ⇄ 2NO₂(g)
0.04 0.04
0.04 - x 0.04 + 2x
The constant of the reaction is:
![Kc = \frac{[NO_{2}]^{2}}{[N_{2}O_{4}]]}](https://tex.z-dn.net/?f=%20Kc%20%3D%20%5Cfrac%7B%5BNO_%7B2%7D%5D%5E%7B2%7D%7D%7B%5BN_%7B2%7DO_%7B4%7D%5D%5D%7D%20)


By solving the above equation for x we have:
x = 0.024 = [NO₂]
Hence the concentration of NO₂ is:
![[NO_{2}] = 0.04 + 2*0.024 = 0.088 M](https://tex.z-dn.net/?f=%20%5BNO_%7B2%7D%5D%20%3D%200.04%20%2B%202%2A0.024%20%3D%200.088%20M%20)
I hope it helps you!