1. Name the following alkanes.

a. 2-methyl-propane.

b. 2-methyl-butane.

c. 4-ethyl-heptane.

d. 4-methyl-3-ethyl-heptane.

e. 3,3,5-trimethyl-heptane.

f. 2-dimethyl-butane.

g. 2-dimethyl-propane.

h. 3-diethyl-pentane.

Explanation:

Hello, for IUPAC rules, take into account that for numbering the organic chain, we must start by the carbon havinf the closest radical to it. Moreover, for naming, we can name alphabetically or by complexity order as shown below:

a. In this case, we consider the middled methyl as a radical in the three-carbon chain, therefore, IUPAC name is 2-methyl-propane.

b. In this case, we consider the methyl at the second carbon in the four-carbon chain (longest one), therefore IUPAC name is 2-methyl-butane.

c. In this case, we consider the ethyl at the fourth carbon in the seven-carbon chain (longest one), therefore IUPAC name is 4-ethyl-heptane.

d. In this case, we consider the ethyl at the third carbon and the methyl at the fourth carbon in the seven-carbon chain (longest one), therefore IUPAC name is 4-methyl-3-ethyl-heptane.

e. In this case, we consider the three at the third and fifth carbons in the seven-carbon chain (longest one), therefore IUPAC name is 3,3,5-trimethyl-heptane.

f. In this case, we consider the two methyles at the second carbon in the four-carbon chain (longest one), therefore IUPAC name is 2-dimethyl-butane.

g. In this case, we consider the two methyles at the second carbon in the three-carbon chain (longest one), therefore IUPAC name is 2-dimethyl-propane.

h. In this case, we consider the two ethyles at the third carbon in the five-carbon chain (longest one), therefore IUPAC name is 3-diethyl-pentane.

Best regards.

answer; talc and gypsum;

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.