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Test 1 - CHEM

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The oxygen atom is partially negative while the Hydrogen atoms are partially positive since the Oxygen atom pulls the pair of electrons towards itself away from the hydrogen atoms. Te partial positive Hydrogen of one molecule attracts the partial negative Oxygen atom of a neighboring molecule. Tus, nighboring molecules end up forming interlocking networks due to strong Hydrogen Bonding. Oher substances may lack the Hydrogen bonding. Feezing causes water molecules to slow down and strengthen the hydrogen bonding. Te hydrogen bonding together with the bent shape of water to a 3-D hexagonal arrangement.

Te array creates empty spaces in the lattice structure and reduces the number of molecules per unit volume. Te reduction in molecules leads to less mass per unit volume. Te solid, terefore, i less dense than the liquid, lading to floating. (10 pts) The gas in a sealed bag of CheetosTM has a volume of 500 mL in Pueblo where the atmospheric pressure is 600 mm of Hg. Yu take this bag to the top of Pikes Peak where the pressure is 420 mm Asuming the temperature on the Peak is the same as Pueblo ( the hot day on the Peak!

) what is the volume of the gas in the CheetosTM bag on the Peak? Sow your work. (5 pts) Lipids (fats) are esters of long chain fatty acids and glycerol. Smilarly, dscribe the general structures of proteins and carbohydrates. I other words, wat are the monomers that these biological polymers are composed of? Sap is a salt formed from a metal (mainly alkali or alkaline earth metals) and a acid of natural origin-plant or animal).

Te fatty acid has an aliphatic carbon chain with a carboxylic acid group at its end. Saps are insoluble in mineral water. Adetergent is synthetic in nature. I has a sulfate or sulfonate group instead of a carboxylic acid group. Tey can also have one or more aromatic rings. Dtergents may act as foaming agents and surfactants due to additional properties. Sreading lime (CaCO3) reduces the excessive level of acid in the soil to promote soil fertility for plant growth. A excess of acid soil lowers growth of a plant by hindering absorption of major plant nutrients such as potassium, posphorus and nitrogen.

Sch nutrients tend to dissolve in acid and leach to lower levels of the soil beyond the reach of the. ..

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preview essay on Test 1 - CHEM
  • Pages: 5 (1250 words)
  • Document Type: Essay
  • Subject: Chemistry
  • Level: Masters
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