1) Which of the following would have the highest surface tension? a molecule wit
ID: 879298 • Letter: 1
Question
1) Which of the following would have the highest surface tension?
a molecule with very strong intermolecular forces
a molecule with very weak intermolecular forces
c.a molecule with a very small degree of cohesive forces
a molecule with very strong adhesive forces
a mixture of molecules with strong and weak adhesive forces
2)Your inventor friend proposes a design of cookware that will allow boiling to take place at a temperature less than 100°C so that food can be cooked with less energy. Comment on this idea.
b.This idea has already been invented and is called a crock pot, or a slow cooker.
c.This is impossible because water only boils at 100°C, unless it is in a vacuum, and it is not possible to create a vacuum outside of the lab.
d.It is a great way to cook food and save energy while preventing vitamins and nutrients from being destroyed in high temperatures.
3)Dip a paper clip into water and then slowly pull it out. You'll find that for a short distance, the water is brought up with the metal. Are these adhesive or cohesive forces at work?
a. These are the adhesive forces between the water and the metal (two different materials). The type of molecular interactions going on are dipole-induced dipole.
b.These are the adhesive forces between the water molecules. The type of molecular interactions going on are dipole-induced dipole.
c.These are the adhesive forces between the water and the metal (two different materials). The type of molecular interactions going on are dipole-dipole.
d.These are the cohesive forces between the water molecules. Water has such a strong attraction for itself that it will cling to the water on the paper clip until the force of gravity is stronger than its cohesive forces.
4) A metallic element with edge length 566 pm crystallizes in a face-centered cubic unit cell. What is radius of the atom?
283 pm
200. pm
245 pm
233 pm
none of the above
a.a molecule with very strong intermolecular forces
b.a molecule with very weak intermolecular forces
c.a molecule with a very small degree of cohesive forces
d.a molecule with very strong adhesive forces
e.a mixture of molecules with strong and weak adhesive forces
Explanation / Answer
1) a. a molecule with very strong intermolecular forces
2) d.It is a great way to cook food and save energy while preventing vitamins and nutrients from being destroyed in high temperatures
3) c.These are the adhesive forces between the water and the metal (two different materials). The type of molecular interactions going on are dipole-dipole.
4) b.200. pm
for FCC a=4r/root2 if we substitute a we will get answer
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