Answer:
a lot that's why it's really hot
Answer:
Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative.Explanation:
Answer:
0.0907 s
Explanation:
This an Arrhenius equation problem, so you relate the half-life with the kinetic constant of the reaction in order to calcule the same thermodynamic parameters at another temperature.
To calcule the kinetic constant of the reaction you need to know the order of it, look closely to the sentence "The value of the half-life is independent of the inital concentration of N2O present." the only order independent from the initial concentration of reagents is first order, so you can calculate K at 800 K, using:
![k(800 K)=\frac{ln(2)}{t_{1/2}}= \frac{ln(2)}{2.14 * 10^{4} s}}=3.239*10^{-5}s^{-1}}](https://tex.z-dn.net/?f=k%28800%20K%29%3D%5Cfrac%7Bln%282%29%7D%7Bt_%7B1%2F2%7D%7D%3D%20%5Cfrac%7Bln%282%29%7D%7B2.14%20%2A%2010%5E%7B4%7D%20s%7D%7D%3D3.239%2A10%5E%7B-5%7Ds%5E%7B-1%7D%7D)
Now you can use Arrhenius equation to calcule K at 1150.66 K
![ln(\frac{k1}{k2} )=-\frac{E_{a} }{R}(\frac{1}{T2} - \frac{1}{T1} )](https://tex.z-dn.net/?f=ln%28%5Cfrac%7Bk1%7D%7Bk2%7D%20%29%3D-%5Cfrac%7BE_%7Ba%7D%20%7D%7BR%7D%28%5Cfrac%7B1%7D%7BT2%7D%20-%20%5Cfrac%7B1%7D%7BT1%7D%20%20%29)
![k2= k1*exp(-\frac{E_{a} }{R}(\frac{1}{T2} - \frac{1}{T1} ))=3.239*10^{-5}s^{-1}*exp(-\frac{270 000 J/mol }{8.314 J/mol *k }(\frac{1}{1150.66K} - \frac{1}{800K} ))=7.639 s^{-1}](https://tex.z-dn.net/?f=k2%3D%20k1%2Aexp%28-%5Cfrac%7BE_%7Ba%7D%20%7D%7BR%7D%28%5Cfrac%7B1%7D%7BT2%7D%20-%20%5Cfrac%7B1%7D%7BT1%7D%20%20%29%29%3D3.239%2A10%5E%7B-5%7Ds%5E%7B-1%7D%2Aexp%28-%5Cfrac%7B270%20000%20J%2Fmol%20%7D%7B8.314%20J%2Fmol%20%2Ak%20%7D%28%5Cfrac%7B1%7D%7B1150.66K%7D%20-%20%5Cfrac%7B1%7D%7B800K%7D%20%20%29%29%3D7.639%20s%5E%7B-1%7D)
Then calculate the new half-life:
![t_{1/2} =\frac{ln(2)}{7.639s^{-1}}=0.0907 s](https://tex.z-dn.net/?f=t_%7B1%2F2%7D%20%3D%5Cfrac%7Bln%282%29%7D%7B7.639s%5E%7B-1%7D%7D%3D0.0907%20s)
Since the soccer ball is heating up the air in the ball will expand, which will cause the ball to grow in size and it will have more volume and pressure but less density. (if you put a soccer ball in water it'll float since it has less weight from the air, that's it's density) hope this helps. <3
Answer/Explanation:
Wood: E
Freshly brewed black coffee: O
Water: O
Lucky Charms: E
Salt: O
Dirt: E
Sausage and mushroom pizza: E
Air: O
Milk: O
Gold: O
Any mixture that looks the same through the substance is homogenous. The different parts are unable to be visibly seen. (Any periodic element is homogenous)
Any mixture that can be easily determined a mix and cannot be evenly separated or dispersed is heterogenous.