One_day_i_wrote_her_name_upon_the_strand Essays -

One_day_i_wrote_her_name_upon_the_strand ?One Day I Wrote Her Name upon the Strand? by Edmund Spenser is a sonnet about a man who vainly tries to write his lover's name in the sand at a beach, only to see it wiped away by the tide. He then realizes that his name will be wiped out as well, eventually (alluding to death). However, the man goes on to realize that his lover's virtues shall last forever in fame (perhaps via this poem, of sorts) and that even in death, their love will live and later be renewed. ?One Day I Wrote Her Name upon the Strand? is a good poem about the powerful feelings of love and fearing not death as the end of love. Poetry and Poets

Dipole Moment Definition

Dipole Moment Definition A dipole moment is a measurement of the separation of two opposite electrical  charges. Dipole moments are a vector quantity. The magnitude is equal to the charge multiplied by the distance between the charges and the direction is from negative charge to positive charge: ÃŽ ¼ q  · r where ÃŽ ¼ is the dipole moment, q is the magnitude of the separated charge, and r is the distance between the charges. Dipole moments are measured in the SI units of coulomb ·meters (C m), but because the charges tend to be very small in magnitude, the historical unit for a dipole moment is the Debye. One Debye is approximately 3.33 x 10-30 C ·m. A typical dipole moment for a molecule is about 1 D. Significance of the Dipole Moment In chemistry, dipole moments are applied to the distribution of electrons between  two bonded atoms. The existence of a dipole moment is the difference between polar and nonpolar bonds. Molecules with a net dipole moment are polar molecules. If the net dipole moment is zero or very, very small, the bond and molecule are considered to be nonpolar. Atoms that have similar electronegativity values tend to form chemical bonds with a very small dipole moment. Example Dipole Moment Values The dipole moment is dependent on temperature, so tables that list the values should state the temperature. At 25 °C, the dipole moment of cyclohexane is 0. It is 1.5 for chloroform and 4.1 for dimethyl sulfoxide. Calculating the Dipole Moment of Water Using a water molecule (H2O), its possible to calculate the magnitude and direction of the dipole moment. By comparing the electronegativity values of hydrogen and oxygen, there is a difference of 1.2e for each hydrogen-oxygen chemical bond. Oxygen has a higher electronegativity than hydrogen, so it exerts a stronger attraction on the electrons shared by the atoms. Also, oxygen has two lone electron pairs. So, you know the dipole moment must point toward the oxygen atoms. The dipole moment is calculated by multiplying the distance between the hydrogen and oxygen atoms by the difference in their charge. Then, the angle between the atoms is used to find the net dipole moment. The angle formed by a water molecule is known to be 104.5 ° and the bond moment of the O-H bond is -1.5D. ÃŽ ¼ 2(1.5)cos(104.5 °/2) 1.84 D