Answer:
O Presence of nucleus in cells
Explanation:
Physical is something you can see with your eyes Chemical is something you can not
E= (231 aj/pm) (-2)(2)/77+140 Pm
E= 231 aj (-4)/217
E= -868 aj/ 217
E= -4aj
Answer:
D) C5H12
Explanation:
The rate of evaporation of a solution depends on the nature of intermolecular forces in the solution. The stronger the magnitude of intermolecular forces present the lower the rate of evaporation.
If we consider the compounds; C7H15OH, C7H15NH2 and C6H13COOH, the presence of polar groups implies that dipole-dipole interactions are present in the molecule leading to stronger intermolecular interaction and a slower rate of evaporation.
On the other hand; C7H16 and C5H12 are alkanes. The intermolecular forces that exists between their molecules is the weak dispersion forces. However, the magnitude of dispersion forces increases as the molecular mass of the compound increases.
Hence, C5H12 has the fastest rate of evaporation since it has the lowest molecular mass.
Answer: fuel cells have a higher efficiency than diesel or gas engines. Most fuel cells operate silently, compared to internal combustion engines.
Explanation:
