If the totaling of bromine to cis-cinnamic acid uses the
same mechanism or device as the addition to trans-cinnamic acid, addition of
bromine only transpires on the top (syn) and not the bottommost face (anti). Therefore,
bromine added to cis-cinnamic only adds to the same face (syn addition) as a
result producing only threo dibromides.
According to
Graham's Law of Diffusion,"the rates of diffusion of two gases are inversely proportional to the square root of their Molar masses or Densities at the same pressure and temperature".
r₁ / r₂ =
Where,
r₁ = Rate of Helium
r₂ = Rate of Oxygen
M₂ = Molar mass of Oxygen = 32 g/mol
M₁ = Molar mass of Fluorine = 4 g/mol
Putting values,
r₁ / r₂ =
r₁ / r₂ =
r₁ / r₂ =
2.82
Result:
Helium gas effuses
2.82 times faster than Oxygen gas.
IV. Molasses will sink because it has a greater density. The rest will float or suspend.
An instrument with high amplitude has loud sound. An instrument with low amplitude has soft sound.
Answer:
D. The kinetic energy is greater after a substance changes from a
solid to a liquid
Explanation:
During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.
- Kinetic energy is the energy accrued due to the motion of a body.
- In a melting process where solids turn to liquid, there is an increase in kinetic energy.
- When randomness of a system increase, kinetic energy also increases.
- From liquid to gas and gas to plasma increases kinetic energy.
- In the other way round, the kinetic energy reduces.