Hi there!
<u>Electronegativity</u> is the concept of how likely an atom is to attract the shared molecules in one of these bonds to itself. We know the molecule water is made up of two hydrogens and one oxygen. The electronegativity of hydrogen is 2.2, and oxygen 3.4. An <u>ionic bond</u> needs at least a difference in electronegativity of 1.6. As the difference is less than that, we can say that water is a covalent molecule. This then wipes out choice B, because it is not ionic, and C, as we have seen it is actually covalent.
Now, we can see the difference in electronegativity between oxygen and hydrogen is still 1.2. This means that while it is not at the point for there to be an ionic bond, there is still a difference in attraction, where the electrons will tend to favor the oxygen more and 'hang around it' more. As electrons are <u>negatively charged</u><em><u>,</u></em> this means that the oxygen will gain a slightly negative charge. This then makes the molecule polar, because it now has a charge within the molecule. This means we have our answer, choice D.
In terms of hydrophobic molecules - they tend to be ones without a charge. (If you're interested in this kind of stuff, I'd search hydrophobic up, and possibly also look into hydrogen bonds).
Hope this helps! Feel free to ask me any other questions you have about this specific problem.
<span>It has 222 kilocalories. Each gram of protein has 4 kilocalories, and each gram of fat has 10 kilocalories. So
28 x 4 = 112
11 x 10 = 110
Total kilocalories is 112 + 110 equal s 222</span>
<span><em>Hyponatremia</em> is a condition that occurs when the concentration of sodium in the blood is too low. Sodium is critical in homeostasis because it maintains the fluid balance. In other words, it helps control the amount of water that circulates in the body. When sodium levels are low it becomes diluted and as a result, the body will have an excess of water, specifically extracellular fluid.
The excess fluid will have nowhere to go, so it goes into the cell. When this happens, it causes the cells to swell, which can lead to several health problems and some of them are life-threatening like cerebral edema. </span>
The controlled variable is what stays the same . So it’s C . They are given different amounts but the same food.
