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Tatiana [17]
2 years ago
7

Silver is the metal with the highest conductivity, followed by copper, gold and aluminium. Why do you think copper and aluminium

are used for electrical wire and cable rather than silver and gold?
Chemistry
1 answer:
Olegator [25]2 years ago
3 0

Explanation:

Copper and aluminum are used for electric wires and cables because they are readily available and cheaper to produce.

The abundance of copper and aluminum is higher compared to silver and gold.

This makes the metals easier to mine than silver and gold. It would be impossible to use the scare amount of gold and silver to make electric wires and cables.

This use cannot be sustained.

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Suppose 40.8g of copper(II) acetate is dissolved in 200.mL of a 0.70 M aqueous solution of sodium chromate.
Contact [7]

Answer:

0.42 M

Explanation:

The reaction that takes place is:

  • Cu(CH₃COO)₂ + Na₂CrO₄ → Cu(CrO₄) + 2Na(CH₃COO)

First we <u>calculate the moles of Na₂CrO₄</u>, using the <em>given volume and concentration</em>:

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  • 0.70 M * 0.200 L = 0.14 moles Na₂CrO₄

Now we <u>calculate the moles of Cu(CH₃COO)₂</u>, using its <em>molar mass</em>:

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Because the molar ratio of Cu(CH₃COO)₂ and Na₂CrO₄ is 1:1, we can directly <u>substract the reacting moles of Na₂CrO₄ from the added moles of Cu(CH₃COO)₂</u>:

  • 0.224 mol - 0.14 mol = 0.085 mol

Finally we <u>calculate the resulting molarity</u> of Cu⁺², from the <em>excess </em>cations remaining:

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4 0
3 years ago
How would the kinetic energy of the rider change if his mass were doubled?
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Explanation:

Given parameters:

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Unknown:

Energy of the photon = ?

Type of radiation = ?

Solution:

The energy of a photon can be derived using the expression below:

      E = \frac{h c}{wavelength}

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c is the speed of light = 3 x 10⁸m/s

Insert the parameters and solve;

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