BIOL 1010 Lecture Notes - Hydrophile, Evaporative Cooler, Hydrogen Bond

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12 Oct 2012

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Water covers about of the earth. Other plants have water, but it is either gas (venus) or water (mars) Recent studies of mars reveal the presence sometime in the past of running fluid, possibly. In nature, water exists in all three physical states of matter- solid, liquid and gas. It can be quite correctly argued that life exists on earth because of the abundant liquid water water. Its polar bonds and asymmetrical shape give water molecules opposite charges on opposite sides. 4 valance orbitals of o point to corners of a tetrahedron. Two corners are orbitals with unshared pairs of electrons and weak negative charge. Two corners are occupied by h atoms which are in polar covalent bonds with o. Oxygen is also electronegative, that shared electrons spend more time around o causing a weak positive charge near h"s. Hydrogen bonding orders water into a higher level of structural organization.

Related Questions

Ionic bonds are formed when two opposite charged ions (formed when atoms lose or gain electrons) encounter each other. These bonds can be viewed as âextreme polar covalent bondsâ as one atom is in total control of the otherâs electron(s). Why are ionic bonds so much weaker when they are in water?

A.	Ionic compounds such as salts are hydrophilic, so they prefer to form bonds with water molecules over other compounds.

B.	Water molecules readily form covalent bonds to charged particles and, as these bonds are stronger than ionic bonds, the ionic bonds are pulled apart.

C.	Water molecules shorten the size of covalent bonds and this weakens ionic interactions.

D.	Water molecules readily donate electrons and nullify the positively charged ions.

E.	Polar water molecules can physically interfere with the polar (positive/ negative) charged attraction between ions and thus the ionic bonds are disrupted and weakened.

Which statement explains why ice floats in liquid water?

Water molecules maintain the same bent shape in liquid and solidstates.

As water molecules go from the liquid to the solid state, theirrate of motion decreases.

Water molecules maintain the same mass as they transition fromthe liquid to the solid state.

The ordered lattice structure of water molecules in ice ismaintained by hydrogen bonds.

The arrangement of water molecules in ice results in fewermolecules per unit volume than in liquid water.

indigorat718

Circle the word of phrase that correctly completes the sentece or answers the question. The property that allows water molecule to be attracted to each other is called (cohesion, adhesion). This propert is conferred by (covalent bonds, hydrogen gonds). This property is conferred by ( covalent bond, hydrogen bond). Ice is ( more dense, less dense) than liquid water. Water is polar molecule because of the unequal sharing of( electrons, protons) between the atoms in H2O. Adhesion of water to a surface is through the action of (covalent bond, ionic bonds, hydrogen bonds) between the water and the surace. Water is converted from liquid to vapor through the brakage of ( colvalent, hydrogen) bonds. Which (one) of these substance is not hydrophilic:( cellulose, oil, NaCl). Which of these will not dissolve in water, even though it is polar?(cellulose, oil, NaCl). Which of these is an electrolyte? (cellusose oil, NaCl). A buffer will contain a week acis , weak base, both).

BIOL 1010 Lecture Notes - Hydrophile, Evaporative Cooler, Hydrogen Bond

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