When a 1:1 mixture of ethyl propanoate and ethyl acetate is treated with sodium ethoxide, four Claisen condensation products are possible. Draw the structure(s) of the product(s) that have a methyl group on the chiral center. Although chirality may be mentioned in the question, do not include chirality in your drawings. Do not draw organic or inorganic by-products. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the sign from the drop-down menu.

elements

explanation:

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that tool would be a compass

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.