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post lab discussion

Renz Erica Santo

on 4 January 2013

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Transcript of chem

Chemistry Laboratory 203 A

Activity No. 1
TESTS TO DIFFERENTIATE ORGANIC FROM INORGANIC COMPOUNDS DATA, RESULTS & DISCUSSION Organic Chemistry is concerned with organic compounds, organic compounds that contain CARBON. Table1. Ignition Tests(Flammability & Charring) DISCUSSION Table2. Solubility test Discussion: Table 3. Electric Conductivity Commonly, electrolytes are solutions of acids, bases, or SALT. Current is moved by molecules called IONS. Electrolyte solutions are normally formed when a salt is placed into a solvent such as water and the individual components dissociate due to the thermodynamic interactions between solvent and solute molecules. When NaCl is placed in water, the salt (a solid) dissolves into its component ions.

NaCl(s) Na+(aq) + Cl−(aq) Discussion: "ANSWER to QUESTIONS" 1. what is the chemical composition of the residue in the charring test? 2. Account for your observed solubilities of Naphthalene and Sodium Chloride in water based on the nature of the bonds that exist in them. 3. what are electrolytes?non electrolytes? 4. based on your observations, what type of bonding is present in glycerol and ethyl alcohol? justify your answers. 5. based on the result in no. 3, classify the compounds accordingly. 6. write generalizations stating the observed properties of organic compounds. CONCLUSION: In this activity, properties of organic compounds will be observed. PROPERTIES such as IGNITION, SOLUBILITY and ELECTRIC CONDUCTIVITY. Also, this activity is designed to tests and KNOW the difference between organic compounds from inorganic compounds. - COVALENT BOND, covalent is between two non metals and non metals are poor conductors of electricity.Therefore, glycerol and ethyl alcohol exhibit covalent bond. -Glycerol and Ethyl Alcohol are non conductors of electricity or non electrolytes

- while, Sodium Chloride is a good conductor of electricity or electrolytes In the experiment conducted, there are certain properties of organic compounds observed. first, organic compounds have low melting and boiling point and they undergo complete combustion. second, organic compounds are insoluble in water and other polar solvents. lastly, organic compounds are poor conductors of electricity because they don't have free electrons for conduction of electricity. The things mentioned above are the observed properties of organic compounds. In the experiment conducted, we are able to differentiate inorganic compounds from organic compounds and we're able to determine the properties that makes them different, Properties like flammability, solubility and electric conductivity. Organic compounds are flammable and inorganic compounds are not. Organic compounds have low solubility in water and have high solubility in non polar solvents. organic compounds are non conductors of electricity while inorganic compounds are god conductors. this activity proves that organic compounds differ with organic compounds because of their properties. REFERENCES:


why salt in water conduct electricity/eHow.com http://ehow.com/how-does_5245694_salt-water-can-conduct-electricity.html#ixzz2CyvnIOwW
http://ca.answer.yahoo.com/question/index?qid=20070220214039AA9pobk Electrolytes are compounds that conducts electricity and they contains free ions. while non electrolytes are compounds that contain molecules that does not conduct electricity. The chemical compositions of the residue in the charring test are CARBON, CARBON DIOXIDE and WATER Ethyl Alcohol contains carbon chain that is short. "The shorter the carbon chain,the lower the boiling point". Ethyl Alcohol is flammable with a boiling point of 78.5 degree Celsius. Organic compounds are flammable and has low boiling point. Therefore, Ethyl Alcohol is an organic compound.

Water don't have carbon molecule. it is not flammable due to its hydrogen bonds and these bonds need high energy before heat is transferred that's why when a lighted matchstick was placed in contact with water, the light turned off. So, water is not an organic compound. Sucrose melts at 186 degree Celsius. it melts when heat is applied, reaction proceed rapidly. Sucrose is an organic compound.

Sodium Chloride has high melting point and high boiling point. Sodium Chloride don't decompose on heating. Its boiling point is about 800 degree Celsius. NaCl is not an organic compound. Naphthalene is insoluble in water because water is a polar solvent and Naphthalene is a non polar solute. "like dissolves like" so, naphthalene dissolves only in non polar solvents. Naphthalene and ether are both non polar. Naphthalene and ether are both organic compounds.

Because of the polarity of water, it can dissolve ionically bonded substances. Sodium Chloride consists of positive sodium ions and negative chloride ions, and water attracts the positive sodium ions and negative chloride ions.Water and NaCl are both inorganic compounds. NaCl is insoluble in ether because they are different, they do not follow the principle of "like dissolves like" Ethyl alcohol (ethanol) is a non electrolyte because it does not ionize when dissolved in water/ they have few ions.

Glycerol is not a conductor in any way, it is organic covalently linked molecule that does not associate in water and as such does not ionize and do not conduct electricity.

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