Tutor profile: Emma N.
Subject: Physical Chemistry
What type of orbital is an electron in, with these four quantum numbers: n= 4, l= 3, ml= -1, ms= -1/2
The orbital the electron is 4f.
What determines a molecule's relative boiling point? Out of H2O, H2S, and H2Se which one has the highest boiling point and why?
The strength of the intermolecular forces that a molecule contains determines whether the molecule has a high or low boiling point. The stronger the intermolecular force (IMF), the higher the boiling point. When IMF's are the same, we look at the size of the molecule to determine the boiling point. The bigger a molecule, the higher the boiling point. H2O possesses the strongest IMF, hydrogen bonding. H2S and H2Se strongest IMF are dipole-dipole bonds. Since H2S and H2Se have the same level of IMF's we now turn to size. Since both contain an equal amount of Hydrogen atoms, we focus on the atom it is bonded to. Sulfur and Selenium are both located in the same group however Sulfur is one period above Selenium on the periodic table. According to periodic trends of atomic size, size increases as the period increases when located in the same group. Based on this trend, we know that Selenium is larger than Sulfur. From Highest to Lowest Boiling Point: H2O>H2Se>H2S
Explain how one of the functions of stems involves competition for light.
If a stem is capable of growing taller than other competing plants, it will not have its leaves or other photosynthetic structures blocked or hidden underneath neighboring plants, therefore granting them the most access to sunlight.
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