Answer:
See detailed mechanism in the image attached
Explanation:
The mechanism shown in detail below is the synthesis of serine in steps.
The first step is the attack of the ethoxide ion base on the diethyl acetamidomalonate substrate giving the enolate and formaldehyde.
The second step is the protonation of the oxyanion from (1) above to form an alcohol as shown.
Acid hydrolysis of the alcohol formed in (3) above yields a tetrahedral intermediate, a dicarboxyamino alcohol.
Decarboxylation of this dicarboxyamino alcohol yields serine, the final product as shown in the image attached.
They found that difference occurs in the speed of both sound and charges occur due to the difference in the type of medium.
Sound and charges needs specific medium for faster movement i.e. sound moves faster in solid as compared to liquid and gas whereas charges moves faster and easily in gold due to lower resistance which is followed by copper. Sound can move from solid, liquid and gases whereas charges move only in solid metal in which free electrons are present. The speed of sound and flow of current are affected due to difference in the arrangement of atoms in solid, liquid and gas.
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Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.
Answer:
Kettle lake
Explanation:
A kettle lake forms when a receeding glaciers leaves glacier behind in a shallow depression called a kettle.
Kettles and kettle lakes are products of glacier deposition. They are mostly attributed to the receeding phase of a glacier. The mouth of a retreating glacier are usually laden with a mix of melt water and sediments. As the glacier continues to retreat, it leaves behind stagnant ice that must have been buried with the sediment. When the ice melts, a kettle which is an hollow depression forms and the water in it makes it a kettle lake.
Alter means change. So when a wave hits a big rock, the rock sheds a tiny bit, creating sand.
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