GSC101 Assignment No 02 Fall 2019 Solution & Discussion
GSC101 General Science Assignment 2 Solution & Discussion Fall 2019
DISCUSS THE MAJOR PART OF ALIMENTARY CANAL SPECIALLY THE ROLE OF ORAL CAVITY.
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GSC101 ASSIGNEMNT 2 SOLUTIONGSC101 ASSIGNEMNT 2 SOLUTION
QUESTION # 1:DISCUSS CHEMICAL BONDING OF ALLOY STELL? ANSWER :Metallic bonding, positive ions in a sea of electrons. Explanation: In a metal, each metal atom is conceived to donate a few of its valence electrons to the lattice, such that metal nuclei acquire a positive charge. This non-localized metallic bonding is believed to be responsible for the general properties of a metal: malleability, ductility, conductivity to heat and electricity. The alkali metals, lithium, sodium, potassium, rubidium, have only the 1 electron to contribute to the metallic lattice. Alkali metals thus tend to be soft, and low melting. Many electron metals, such as iron, have higher melting points, but do retain malleability and ductility at elevated temperatures.So, steel is a metal, and as such displays metallic bonding . What makes steel steel is the addition of a little carbon during its manufacture (up to 1-2% w/w). Steel is thus an alloy of iron and carbon, and is the premier material for tools.How the carbon is bound to the iron atoms, is beyond me, and it is an area where chemistry turns into metallurgy, where end use and function takes a higher precedence than chemistry. Many other metals are present in steel, and the various alloys may be tailor-made for a specific purpose.SHOW THE CHEMICAL REACTION IN WHICH CHLORINE ACT AS OXIDIZING AGENT?ANSWER:Cl2+2I−→2Cl−+I2(1)(1)Cl2+2I−→2Cl−+I2 •
The iodide ions lose electrons to form iodine molecules. In other words, they are oxidized. • The chlorine molecules gain electrons to form chloride ions— they are reduced. This is therefore a redox reaction in which chlorine acts as an oxidizing agent.NAME THE NATURAL SOURCE OF THE GIVEN ACID? SOLUTION: NATURAL SOURCE ACID CITRIC ACID Lemons, OXALIC ACID tomato LACTIC ACID curd TARTARIC ACID tamarind
QUESTION # 2:DISCUSS THE MAJOR PART OF ALIMENTARY CANAL SPECIALLY THE ROLE OF ORAL CAVITY.SOLUTION :Alimentary canal in humans consist of following parts:
Oral cavityPharynxEsophagusStomachIntestine (small and large) Rectum and anus
ROLE OF ORAL CAVITYFood selection is one function of the oral cavity. Oral cavity has tongue with taste buds. Food selection takes place by taste buds if food tastes bad it is rejected. Tongue converts the ground food mass to a bolus. Grinding the food is the other important function of oral cavity. Oral cavity contains teeth for this purpose. Dentition is according the food types. Teeth are of four types; incisors, canine, premolars and molars. Human have all four types of teeth; few animals have others. Lubrication and chemical digestion is another function of the oral cavity. Salivary glands secrete saliva which contains amylase for digestion of starch. It also contains mucous for lubrication of food.
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