Questions 7-9 refer to the following substances.
(A) H2
(B) CH3OH
(C) CH2Cl2
(D) KCl
(E) Co
7. Is a solid at 25C and 1 atm
8. Is capable of hydrogen bonding
9. Its properties are governed by London(dispersion) forces.
We would be interested in your thoughts and why you think that way.
asdas
To answer questions 7-9, we need to consider the given substances and identify their properties. Let's analyze each substance one by one:
(A) H2:
- H2 represents a molecule of hydrogen gas, which is a diatomic gas at room temperature.
- At 25°C and 1 atm (standard conditions), hydrogen gas is in a gaseous state, not solid.
(B) CH3OH:
- CH3OH represents methanol, which is a chemical compound used as a solvent and fuel.
- Methanol is a liquid at room temperature, so it is not a solid.
(C) CH2Cl2:
- CH2Cl2 represents dichloromethane, which is a volatile chemical compound commonly used as a solvent.
- Dichloromethane is a liquid at room temperature, so it is not a solid.
(D) KCl:
- KCl represents potassium chloride, which is a solid compound commonly used as a salt substitute.
- Potassium chloride is indeed a solid at room temperature (25°C) and standard pressure.
(E) Co:
- Co represents cobalt, which is a metallic chemical element.
- Cobalt is a solid at room temperature and standard pressure.
Now, we can provide the answers to the given questions:
7. Is a solid at 25°C and 1 atm
Answer: (D) KCl
8. Is capable of hydrogen bonding
Hydrogen bonding occurs when hydrogen is bonded to a highly electronegative atom, such as oxygen, nitrogen, or fluorine. Looking at the given substances, the only one that contains hydrogen bonded to an electronegative atom is methanol (CH3OH). Therefore, the answer is:
Answer: (B) CH3OH
9. Its properties are governed by London (dispersion) forces
London dispersion forces are temporary attractive forces between molecules caused by the temporary shifting of electron clouds. These forces exist between all molecules, but they are generally stronger in larger, more polarizable molecules. Looking at the given substances, the only one that is likely to experience London forces predominantly is cobalt (Co). Therefore, the answer is:
Answer: (E) Co