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Test 1 - CHEM Essay Example

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Test 1 - CHEM

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.The partial positive Hydrogen of one molecule attracts the partial negative Oxygen atom of a neighboring molecule. Thus, neighboring molecules end up forming interlocking networks due to strong Hydrogen Bonding. Other substances may lack the Hydrogen bonding.Freezing causes water molecules to slow down and strengthen the hydrogen bonding. The hydrogen bonding together with the bent shape of water molecules leads to a 3-D hexagonal arrangement. The array creates empty spaces in the lattice structure and reduces the number of molecules per unit volume. The reduction in molecules leads to less mass per unit volume. The solid, therefore, is less dense than the liquid, leading 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. You take this bag to the top of Pikes Peak where the pressure is 420 mm of Hg. Assuming 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? Show your work. ( 5 pts) Lipids (fats) are esters of long chain fatty acids and glycerol. Similarly, describe the general structures of proteins and carbohydrates. In other words, what are the monomers that these biological polymers are composed of?Soap is a salt formed from a metal (mainly alkali or alkaline earth metals) and a fatty acid ( of natural origin-plant or animal). The fatty acid has an aliphatic carbon chain with a carboxylic acid group at its end. Soaps are insoluble in mineral water.A detergent is synthetic in nature. It has a sulfate or sulfonate group instead of a carboxylic acid group. They can also have one or more aromatic rings. Detergents may act as foaming agents and surfactants due to additional properties.Spreading lime (CaCO3) reduces the excessive level of acid in the soil to promote soil fertility for plant growth. An excess amount of acid in soil lowers growth of a plant by hindering absorption of major plant nutrients such as potassium, phosphorus and nitrogen. Such nutrients tend to dissolve in acid and leach to lower levels of the soil beyond the reach of the

Reference

Joesten, Castellion & Hogg. 4 th Ed. (2007). The World of Chemistry Essentials. CengageBrooks Cole Publisher. ISBN-10: 0495012130 ISBN-13: 9780495012139
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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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