In the box below draw the tetrahedral representation of the s enantiomer of the amino acid valine, ch3ch(ch3)ch(nh2)co2h.
1 answer:
The S-Enantiomer of Valine is attached below.
Assigning S-Configuration:
In Valine there is only one <em>chiral carbon</em> (carbon to which all bonded atoms or group of atoms attached have different masses). This carbon also known as <em>alpha carbon</em> has a tetrahedral geometry. For S-configuration, according to<em> Cahn Ingold Prelog Rules</em> the -NH₂ group is assigned with priority order of 1, The carbon of carboxylic acid is assigned the number two and the tertiary carbon is assigned with number three. These three groups are made in such a way that moving from number 1 to number 3 makes a S sign or anticlockwise rotation while keeping the hydrogen atom behind the plane.
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Answer:
(a) coal burning: chemical change
(b) ice melting: physical change
(c) mixing chocolate syrup with milk : physical change
(d) explosion of a firecracker: chemical change
(e) magnetizing of a screwdriver: physical change
Explanation:
A physical change changes the physical form or the appearance or the property of the substance, but the chemical composition of the matter remains the same. Such a change is reversible in nature.
Whereas; a chemical change involves a chemical reaction, resulting in the change in the chemical composition of the matter. A chemical change results in the formation of a new substance and is generally irreversible in nature.
(a) coal burning: It is a chemical change because the combustion of coal changes its chemical composition. When coal (carbon) is burned carbon dioxide is released. Irreversible in nature
(b) ice melting: It is a physical change because ice the solid phase of water melts to get converted to the liquid phase of water only and no change in the chemical composition is seen.
(c) mixing chocolate syrup with milk : It is a physical change because on dissolving chocolate syrup in milk, only the color of the milk changes, therefore there is change in the property. As, it involves mixing of two miscible liquids and does not involve any change in the chemical composition of either of the two liquids.
(d) explosion of a firecracker: it is a chemical process, as it involves combustion of an explosive material to produce carbon dioxide, carbon monoxide and water vapour. It is a chemical change because it involves change in the chemical composition. Irreversible in nature
(e) magnetizing of a screwdriver: It is physical change because on magnetization only the magnetic property of the screwdriver changes AND there is no change in the chemical composition of the matter.