Answer:
High melting points and boiling points
Aqueous solutions are good conductors of electricity
Explanation:
The oppositely-charged ions have strong attractions for each other, so it takes much energy to separate them.
When the ions are the molten state or in aqueous solution, they are free to move towards the oppositely-charged electrodes. The movement of charge constitutes an electric current.
The question is incomplete. Here is the complete question.
An atom of lead has a radius of 154 pm and the average orbitalspeed of the electron in it is about 1.8x m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of lead. Write your answer as a percentage of the average speed, and round it to significant 2 digits.
Answer: v% = 0.21 m/s
Explanation: To calculate the uncertainty, use <u>Heisenberg's Uncertainty Principle</u>, which states that: ΔpΔx≥
where h is <u>Planck's constant</u> and it is equal to 6.626.m²kg/s.
Since p (momentum) is p = m.v:
mΔv.Δx ≥
Δv =
Given that: r = x = 1.54.m and mass of an electron is m=9.1.
kg
Δv =
Δv = 0.0376.
As percentage of average speed:
Δv..100% =
.10² = 0.021.10 = 0.21%
The least possible uncertainty in a speed of an electron is 0.21%.