Answer:
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
Explanation:
Here are the steps for finding an emprical formula.
To begin, we need to change the grams to a percentage. We can simply take the number and call it our percentage. (i.e 0.262%)
Then, we have a simply stoichiometry step. We put our starting number over 1, as usual. The next "Step" is putting in the molar mass of that particular element on the bottom, with one on top. It should look like this:
0.262% N 1
-------------- x ----------------
1 14.007g N
We would then divide those two numbers to get our answer. Repeat for the other elements included, until we have all of them done.
After that, we need to find the smallest number that was the answer to one of the equations. For example, if the product of Hydrogen was the smallest formed, we would locate that number. We then divide ALL of our answers by that smallest number.
Remember, whenever doing empirical formulas, significant figures matter.
Once we have our smallest numbers, we need to round our numbers to the nearest whole number. HOWEVER, to do this we need to multiply all of the numbers by the SAME whole number.
For example, if one of our numbers was 1.33, we would multiply by 3 to get a whole number. However, we would also need to multiply the rest of our products by the same number. If we do not get close to whole numbers (you can round), we need to try with multiplying a different number.
Then, we need to take those whole numbers we got for each number, and plug in to make a compound. For example, if our products were 6 for nitrogen, 3 for hydrogen, and 2 for chlorine, our final empirical formula would be N6H3Cl2.
Hope I could help! If it was a bit wordy please let me know and I'd be more than willing to clarify.
Rf value is the ratio of the distance traveled by the solute to that of the solvent front on the paper used in chromatographic separation.
From the image it is clear the distance traveled by solvent front = 7.3 cm
Distance traveled by the component -1 of the mixture = 1.4 cm
Distance traveled by the component -2 of the mixture = 3.0 cm
Distance traveled by the component -3 of the mixture = 4.5 cm
Distance traveled by the component -4 of the mixture = 6.5 cm
Rf value of component-1 = ![\frac{1.4 cm}{7.3 cm} =0.192](https://tex.z-dn.net/?f=%5Cfrac%7B1.4%20cm%7D%7B7.3%20cm%7D%20%3D0.192)
Rf value of component-2 = ![\frac{3.0 cm}{7.3 cm} =0.410](https://tex.z-dn.net/?f=%5Cfrac%7B3.0%20cm%7D%7B7.3%20cm%7D%20%3D0.410)
Rf value of component-3 = ![\frac{4.5 cm}{7.3 cm} =0.616](https://tex.z-dn.net/?f=%5Cfrac%7B4.5%20cm%7D%7B7.3%20cm%7D%20%3D0.616)
Rf value of component-4 = ![\frac{6.5 cm}{7.3 cm} =0.890](https://tex.z-dn.net/?f=%5Cfrac%7B6.5%20cm%7D%7B7.3%20cm%7D%20%3D0.890)
b) Samples can be separated from a mixture using chromatography as the relative affinities for the compounds towards the paper (stationary phase) and the solvent(mobile phase) are different. Each component spends different amounts of time on the stationary phase depending on it chemical nature. So, the components in a mixture can be separated based on their polarities and relative degrees of adsorption on the stationary phase.
Answer:
Natural selection
Explanation:
Adaptation deals with organisms becoming more suited for their environment. It does not directly determine survival and reproduction.
Artificial selection is caused by humans. Therefore, adaptability may not play a role in this selection.
Natural selection is caused directly through adaptability. It results in organisms reproducing if they are capable of survival. Organisms that cannot adapt do not survive.
Answer:
pH is 8.52
Explanation:
According to the working in the photo