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Sia ? 6 years, 3 months ago
{tex}Mole\;fraction,\;x\;=\frac{\frac wm}{\frac wm+\frac WM}{/tex}
(where, w and m represent the mass and molar mass of solute and W and M represent the mass and molar mass of solvent.)
{tex}\frac1x\;=\frac{\frac wm+\frac WM}{\frac wm}{/tex}
{tex}\frac1x=1+\frac{W\times m}{M\times w}\times\frac{1000}{1000}{/tex}
{tex}\frac1x=1+\frac{1000}{M\times m}{/tex}({tex}\because{/tex}Molality, {tex}m=\frac{w\times1000}{m\times W}{/tex})
{tex}=1+\frac{1000}{18\times4.5}{/tex} ({tex}\because{/tex} Molor mass of H2O=18gmol-1)
{tex}=1+\frac{1000}{81}{/tex}
{tex}=\frac{1081}{81}=13.34{/tex}
{tex}x=\frac1{13.34}=0.075{/tex}
Posted by Basketball Bloopers 6 years, 3 months ago
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Sia ? 6 years, 3 months ago
Internet addiction is described as an impulse control disorder, which does not involve use of an intoxicating drug and is very similar to pathological gambling. Some Internet users may develop an emotional attachment to on-line friends and activities they create on their computer screens. Internet users may enjoy aspects of the Internet that allow them to meet, socialize, and exchange ideas through the use of chat rooms, social networking websites, or "virtual communities." Other Internet users spend endless hours researching topics of interest Online or "blogging". Blogging is a contraction of the term "Web log", in which an individual will post commentaries and keep regular chronicle of events. It can be viewed as journaling and the entries are primarily textual.
Similar to other addictions, those suffering from Internet addiction use the virtual fantasy world to connect with real people through the Internet, as a substitution for real-life human connection, which they are unable to achieve normally.
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Sia ? 6 years, 3 months ago
Given, Mass of solute (glycerol) (W2) =?
Molar mass of solute (M2) = 92 g mol-1
Mass of solvent (water) (W1) = 500g
{tex}\Delta{/tex}Tb = 100.42oC - 100oC
= 0.42oC = 0.42 k
Kb = 0.512 k kg mol-1
{tex}\therefore{/tex} {tex}\Delta{/tex}Tb = Kb {tex} \times \frac{{{W_2}}}{{{M_2}}}{/tex}{tex}\times{/tex} {tex}\frac{100}{W_1}{/tex} {tex}\therefore{/tex} W2 = {tex}\frac{{{\Delta T_b} \times {M_2}\, \times {W_1}\,}}{{{K_b} \times \,100}}{/tex}
W2 = {tex}\frac{{0.42 \times 92\, \times 500\,}}{{0.512 \times 1000}}{/tex}
W2 = 37.73 g
Hence, the mass of glycerol dissolved = 37.73 g.
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The Enemy is a story set in Japan during the second world war. In this story, an injured American army man washes up on the beach near the home of a Japanese surgeon, Dr. Sadao Hoki. Although he has lived in America and follows a modern profession, Dr Sadao’s family lives a traditional Japanese life.
Dr Sadao is in a dilemma to leave the American man to die, to throw him back into the sea, to hand him over to the army or to save his life. He reluctantly takes him home and decides to save his life. The presence of an enemy disrupts his family life. His wife is against his idea of operating upon and taking care of the soldier. The servants of the house oppose the idea and leave their master. Yet, Dr Sadao shelters him, operates upon him, and saves his life.
Out of the fear of being accused of sheltering an enemy, he narrates the incident to a general in the Japanese military. The general helps Dr Sadao and offers to get the man killed by hired killers. However, the killing doesn't take place, and after waiting for three nights, Dr. Sadao thinks of getting rid of the American himself. He arranges a boat for the man to help him reach the nearby island. He provides him necessities like food and clothing to survive till he finds a Korean fishing boat which could rescue him. Dr. Sadao wonders that why did he save the life of an enemy.
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Sia ? 6 years, 3 months ago
Mendel selected garden pea for his experiment for the following reasons-
Easy to Cultivate: Pea plant (Pisum sativum) was easy to cultivate. It grew well in his garden.
Hermaphrodite: Its flowers were hermaphrodite I.e. pea plant have both male and female sexual organs.
Cross-fertilization (Cross-Pollination) Easily Controlled: It was normally self-fertilizing (self-pollinating) that is the fertilization of plants and some invertebrate animals by their own pollen or sperm rather than that of another individual, but could also be cross fertilized (cross-pollinated) that is the transfer of pollen grains from an anther of a flower of one plant to a stigma of a flower of another plant of the same species.
Short Generation Time: As the time gap between generations was short, Mendel could raise many generations of pea within a short time. This is one of the main reason for choosing Pea plant (Pisum sativum).
Many Distinct Traits: Pea had many sharply distinct. its each trait had two clear cut alternative forms or varieties: e.g. seed shape had a round or wrinkled phenotype, plant height was either tall or short, seed color could be yellow or green etc. Mendel called them pair of contrasting traits. He focused on seven such contrasting pair of traits.
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