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noname [10]
2 years ago
8

Why is electrical conductivity a resourceful property of metals like copper, silver, and aluminum?

Chemistry
1 answer:
aleksley [76]2 years ago
3 0

Answer:

The electrical conductivity of metals come from the fact that their outer electrons have been delocalised (meaning that the elections are not locked into atoms but can move freely throughout the metal ) .

And , the electrical conductivity of a metal is determined by the ease of movement of the electrons past the atoms<em> </em><em>under the influence of an electric field</em>.

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If a tree dies and the trunk remains undisturbed for 13,750 years, what percentage of the original 14c is still present? (the ha
defon

Answer:

18.94%.

Explanation:

  • The decay of carbon-14 is a first order reaction.
  • The rate constant of the reaction (k) in a first order reaction = ln (2)/half-life = 0.693/(5730 year) = 1.21 x 10⁻⁴ year⁻¹.
  • The integration law of a first order reaction is:

<em>kt = ln [A₀]/[A]</em>

k is the rate constant = 1.21 x 10⁻⁴ year⁻¹.

t is the time = 13,750 years.

[A₀] is the initial percentage of carbon-14 = 100.0 %.

[A] is the remaining percentage of carbon-14 = ??? %.

∵ kt = ln [Ao]/[A]

∴ (1.21 x 10⁻⁴ year⁻¹)(13,750 years) = ln (100.0%)/[A]

1.664 =  ln (100.0%)/[A]

Taking exponential for both sides:

5.279 = (100.0%)/[A]

<em>∴ [A]</em> = (100.0%)/5.279 = <em>18.94%.</em>

8 0
2 years ago
Which is the strongest base among NO3-, So4-, CH3COO- and Cl-​
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Answer:

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Acetic acid is a weak acid, so its conjugate base (CH3COO-) is a strong base.

Nitric, sulfuric, and hydrochloric acids are all strong acid. Their conjugate bases (NO3-, SO4^2-, and Cl- are all weak bases.

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The difference between air temperatures over water and over
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