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madam [21]
3 years ago
10

5. How can you tell the difference between CuS and Cu2S

Chemistry
1 answer:
puteri [66]3 years ago
6 0

Answer:

Density, melting point. and magnetic properties  

Explanation:

I can think of three ways.

1. Density

The density of Cu₂S is 5.6 g/cm³; that of CuS is 4.76 g/cm³.

It should be possible to distinguish these even with high school equipment.

2. Melting point

Cu₂S melts at 1130 °C (yellowish-red); CuS decomposes at 500 °C (faint red).

A Bunsen burner can easily reach these temperatures.

3. Magnetic properties

You can use a Gouy balance to measure the magnetic susceptibilities.

In Cu₂S the Cu⁺ ion has a d¹⁰ electron configuration, so all the electrons are paired and the solid is diamagnetic.

In CuS the Cu²⁺ ion has a d⁹ electron configuration, so all there is an unpaired electron and the solid is paramagnetic.

A sample of Cu₂S will be repelled by the magnetic field and show a decrease in weight.

A sample of CuS will be attracted by the magnetic field and show an increase in weight.

In the picture below, you can see the sample partially suspended between the poles of an electromagnet.

 

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Explanation:

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KMnO4-

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3 years ago
is there a relationship between the relative age of stars in the number/identity of element is found within them
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What is the pH of a<br> 2.5 x 10-5 M solution<br> of HCI?
aalyn [17]

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The pH of the solution is 4.60.

Explanation:

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In which case would an electron experience the greatest effective nuclear charge? not all cases describe an atom in the ground s
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In contrast, the outside electrons in an atom with many electrons are drawn to the positive nucleus and repelled by the negatively charged electrons at the same time. The force between two stationary, electrically charged particles can be measured using Coulomb's law inverse-square law, also known as Coulomb's law. Conventionally, the electric force between two charged objects at rest is referred to as the Coulomb force or electrostatic force.

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brainly.com/question/506926

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I need help please, will give 5 stars
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