-boiling points decrease as branching increases,-branched alkanes have less surface area in contact so the intermolecular forces are fewer and weaker,-therefore less energy is required to overcome the intermolecular forces, Just to add that a sphere is the shape with the smallest surface area to volume ratio. The area of the surface of an object is called its surface area. As the volume of the cell increases so does the surface area however not to the same extent. Magnamind ... why does calcium fluoride have a high melting point The rate of a chemical reaction can be raised by increasing the surface area of a solid reactant. The reason is said to be because of the decrease in surface area, same as explained before. The summary relationships are presented as follows: linear versus branched â> higher melting/boiling points due to better stacking and surface area contact. The above extract from my book, mentions clearly that branching makes the molecule more compact and thereby decreases the surface area. The rate of reaction is proportional to the current flowing through, which by Ohm's Law is $\frac{V}{R}$. If the lungs did not branch at all, there would be one alveolus. As we decrease surface area, we are going to decrease intermolecular Van Der Waals interaction and therefore decrease boiling point. Even for isomeric alkyl halides, the boiling points decrease with branching. The correct answer was (2), but I'm not sure why the reaction rate would go up if the surface area of the silver electrode increased. When the cell gets bigger its surface area to volume ratio gets smaller. Effect of surface area. If we calculate the surface area â¦ Cite. The more branching there is the more spherical is the molecule and hence the smaller surface area for a given volume (relative molecular mass). Rayees Ahmad Rather. All Answers (4) 6th Feb, 2018. 2. reply. Smaller means more surface area, be it pores or particles. To illustrate this we can use three different cubes. If they branched once, there would be two alveoli. The first cube has a side of 1 cm, the second 3 cm and the third 4 cm. This means that the resistance must have decreased if current increases. The rate of a chemical reaction can be raised by increasing the surface area of a solid reactant. To provide this surface area, lungs branch many times, like a tree, and end in little sacs called alveoli, where oxygen and carbon dioxide are exchanged between the air and blood. There was this question in a past paper i was doing for chemistry about why branched hydrocarbon chains have a lower boiling point, and i thought it would be because they can not pack together as efficiently so the van der Waals are weaker, because that is what i had read in the book, but apparently it is to do with surface areaâ¦ Pore volume also decreases with larger pores (hence smaller number of pores). 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