Answer:
we would need a bit more info for this
Explanation:
Answer:
D.Salad
Explanation:
A mixture is a substance that combines two or more substance that are physically combined. A mixture can be easily seperated by a physical means . A mixture is the combination of various substances that are not chemically combined .Examples of mixtures are cake and salad . The cake contains various substances like egg, flour and sugar. This mixture can be easily separated into it individual entities by a physical means .
Base on the option the only mixture among the option is salad . Salad is a a mixtures that combines substances like tomatoes , fruits and vegetable. The individual substances that makes up the salad can be easily separated.
Sugar is a compound . Water is a compound as it contains two elements and potassium is an element.
Answer: when the temperature is increased, the number of collisions per second increases.
Explanation:
the rate of collisions and the temperature is directly proportional. If the energy of the gas particles is boosted by using the temperature, the chances of the particles bumping into each other due to the high energy increases, thus increasing the number of collisions. This also increases the rate of reaction. Thus when temperature is increased the number of collisions also increases.
The mass percent lithium hydroxide in the mixture with potassium hydroxide, calculated from the equivalence point in the titration of HCl with the mixture, is 19.0%.
The mass percent of lithium hydroxide can be calculated with the following equation:
(1)
Where:
(2)
We need to find the mass of LiOH.
From the titration, we can find the number of moles of the mixture since the number of moles of the acid is equal to the number of moles of the bases at the equivalence point.
![\eta_{HCl} = \eta_{LiOH} + \eta_{KOH}](https://tex.z-dn.net/?f=%20%5Ceta_%7BHCl%7D%20%3D%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20)
![0.0271 L*0.3565 \frac{mol}{L} = \eta_{LiOH} + \eta_{KOH}](https://tex.z-dn.net/?f=%200.0271%20L%2A0.3565%20%5Cfrac%7Bmol%7D%7BL%7D%20%3D%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20)
![\eta_{LiOH} + \eta_{KOH} = 9.66 \cdot 10^{-3} \:mol](https://tex.z-dn.net/?f=%20%5Ceta_%7BLiOH%7D%20%2B%20%5Ceta_%7BKOH%7D%20%3D%209.66%20%5Ccdot%2010%5E%7B-3%7D%20%5C%3Amol%20)
Since mol = m/M, where M: is the molar mass and m is the mass, we have:
(3)
Solving equation (2) for m_{KOH} and entering into equation (3), we can find the mass of LiOH:
Solving for
, we have:
![m_{LiOH} = 0.082 g](https://tex.z-dn.net/?f=%20m_%7BLiOH%7D%20%3D%200.082%20g%20)
Hence, the percent lithium hydroxide is (eq 1):
Therefore, the mass percent lithium hydroxide in the mixture is 19.0%.
Learn more about mass percent here:
I hope it helps you!