Which sentence best explains the high melting point, boiling point, and surface tension of water? A. The hydrogen atom on each w
ater molecule is strongly attracted to the hydrogen atoms on nearby molecules. B. Ions dissolved in the water cause nearby molecules to become temporarily polar. C. The water molecules are connected to each other with covalent bonds. D. Water molecules that have lost electrons attract the water molecules that have gained electrons. E. The negative side of each water molecule is attracted to the positive sides of nearby molecules.
2 answers:
Answer: E. The negative side of each water molecule is attracted to the positive sides of nearby molecules.
Explanation: The high melting point, high boiling point and high surface tension of water is due to strong cohesive forces present among molecules of water.
The strong inter molecular forces among water molecules is due to strong hydrogen bonding which is due to bonding between a more electronegative oxygen atom bearing a partial negative charge with a less electronegative hydrogen atom bearing a partial positive charge.
Thus the negative side of each water molecule is attracted to the positive sides of nearby molecules.
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Answer:
Ratio of Vrms of argon to Vrms of hydrogen = 0.316 : 1
Explanation:
The root-mean-square speed measures the average speed of particles in a gas, and is given by the following formula:
Vrms =
where R is molar gas constant = 8.3145 J/K.mol, T is temperature in kelvin, M is molar mass of gas in Kg/mol
For argon, M = 40/1000 Kg/mol = 0.04 Kg/mol, T = 4T , R = R
Vrms = √(3 * R *4T)/0.04 = √300RT
For hydrogen; M = 1/1000 Kg/mol = 0.001 Kg/mol, T = T, R = R
Vrms = √(3 * R *T)/0.001 = √3000RT
Ratio of Vrms of argon to that of hydrogen = √300RT / √3000RT = 0.316
Ratio of Vrms of argon to that of hydrogen = 0.316 : 1