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.
The answer is d. Food chain
Having a platelet count of 60,000/mirol is below the normal count of 150,000 which is called thrombocytopenia. With this low platelet count, our skin which is part of the integumentary system will show signs of Petechiae. Petechiae are formed and seen on the skin when capillaries underneath leaks blood due to low platelet count. Petechiae is commonly found on a person suffering from Dengue Hemorrhagic fever Disease where platelet count decreases.
Considere la fórmula para la glucosa: C6H12O6<span>. </span>¿Qué indica esto acerca de la relación de los reactivos a la glucosa?<span>Doce agua (H2O) moléculas se utilizaron para hacerlo.</span><span>Doce de hidrógeno (H2) Se utilizaron moléculas para hacerlo.</span><span>Seis de oxígeno (O2) Se utilizaron moléculas para hacerlo.</span><span>Seis dióxido de carbono (CO2<span>) Se utilizaron moléculas para hacerlo</span></span>
<h3><u>Answer;</u></h3>
primary ecological succession
A glacier retreats exposing bare rock and allowing communities of organisms such as moss and lichens to move in. This is an example of <u>primary ecological succession.</u>
<h3><u>Explanation</u>;</h3>
- Primary succession is a type of succession that occurs following an opening of a pristine habitat, for example, a lava flow, an area left from retreated glacier, or abandoned strip mine.
- <em><u>Primary succession occurs in lifeless area; that is regions in which soil is incapable of sustaining life.</u></em>
- <em><u>The first organisms to appear in areas of primary succession are often mosses or lichens, often known as pioneer species because they are the first species present.</u></em>