A) Hydrogen bonds are strong enough to confer structural stability, for example in DNA. B) Hydrogen bonds are weak enough to be easily broken (weaker than covalent bonds). C) They contribute to the water solubility of many macromolecules. D) All of the above Answer: D Page Ref: Section 5 27) London dispersion forces are attractive forces that arise due to A) infinitesimal dipoles generated by the constant random motion of electrons. B) permanent dipoles of molecules containing covalent bonds between atoms of very different electronegativities.
The shape and function of cell membranes depend on the interaction of polar water with nonpolar membrane molecules. What type of chemical bonding does water have? Answer: The atoms in water molecules are connected via covalent bonds, which means the hydrogen and oxygen share electrons (rather than taking electrons from each other as in in ionic bonds). The covalent bonds in water are very polar, which means that the oxygen has a partial negative charge and the hydrogens have partial positive charges. Because it is so polar, water can form hydrogen bonds, where the oxygen from one molecule of water has a strong attraction to the hydrogen atoms in another molecule of water.
Western Governors University UIT1- Task 2 Surface Tension Experiment Although we may not realize, surface tension plays a large role in our everyday life. Surface tension of a liquid refers to “the cohesive forces between molecules” in a given liquid (Surface Tension, n.d.). Basically, it is what holds the molecules in a liquid together. Different liquids have distinctive and dissimilar surface tensions. The question is, how can you determine which liquids have a strong surface tension and which have a weak surface tension?
Chapter Two: Freezing Point Depression Measurements Purpose: The purpose of this lab is to measure freezing points and freezing point depression for several solutions. The freezing point depression constant (Kf) for p-xylene was calculated from freezing point measurements and used to estimate the molar masses of three unknown solutes in a p-xylene solution. The end goal of this lab experiment is to correctly identify these three unknown solutes. The molar mass of a solute is able to be determined through freezing point depression measurements because the increase in solutes disrupts crystal formation, requiring a lower temperature to form a lattice. This colligative property is important in many industries, but is clear to see when using ordinary salt to remove ice from steps or a driveway.
Lab: I Scream, We All Scream for …Colligative Properties!? Introduction: When a solute is added to water the physical properties of freezing point and boiling point change. Water normally freezes at 0oC and boils at 100oC. As more solute is added, the freezing point drops (“freezing point depression”) and the boiling point increases (“boiling point elevation”). This property is useful in our lives.
Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
1. Polarity is when electrons are not shared equally in a covalent bond, the molecule is described as polar. Capillary action is cohesion of water causes capillary attraction, which is the ability f water to move upward in small spaces. Surface tension is water that is considered the universal solvent because its bipolar molecule enables it to dissolve a wide variety of substances. Density is another property of water during phase changes.
How can you account for this observation? -There are catalase enzymes in your body and they break down the hydrogen peroxide into water and oxygen. The foam is the oxygen bubbles that form in the water. 7. Why is it important for organisms to regulate internal temperatures or metabolic processes at different temperatures?
Next the freezing point which didn’t eliminate either of them. Next we look at the mass which was 7.465g/ml. This make me lean toward ethyl ether but the masses were still pretty close. Next we move to the solubility of the substances. They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble.
Salt dissolves in water because ions become separated by polarised water molecules. Water is the most common molecule in the human body, and is the most important solvent in the human body and most chemical reactions involve molecules dissolved in