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MatroZZZ [7]
3 years ago
12

He then takes a powerful magnet and positions it below the table and the keys. He finds that he is able to drag the keys along t

he table by moving the magnet. This demonstrates that
Chemistry
1 answer:
Mamont248 [21]3 years ago
7 0

C. magnetic forces act at a distance

Explanation:

Since he was able to drag the keys along the table by moving the magnet, it shows that magnetic forces acts a distance.

Magnetism is a property exhibited by a wide range of materials.

Around a bar magnet, there are field forces in which the forces of the magnets are felt.

  • Magnetic forces are non- contact forces. They don't need to be together to exert their force.
  • This is why magnetic forces act at a distance.

learn more:

Electromagnet brainly.com/question/2191993

#learnwithBrainly

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A 19.0 L helium tank is pressurized to 26.0 atm. When connected to this tank, a balloon will inflate because the pressure inside
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Answer:

The new volume of the balloon when the pressure equalised with the pressure of the atmosphere = 494 L.

The balloon expands by am additional 475 L.

Explanation:

Assuming Helium behaves like an ideal gas and temperature is constant.

According to Boyle's law for ideal gases, at constant temperature,

P₁V₁ = P₂V₂

P₁ = 26 atm

V₁ = 19.0 L

P₂ = 1 atm (the balloon is said to expand till the pressure matches the pressure of the atmpsphere; and the pressure of the atmosphere is 1 atm)

V₂ = ?

P₁V₁ = P₂V₂

(26 × 19) = 1 × V₂

V₂ = 494 L (it is assumed the balloon never bursts)

The new volume of the balloon when the pressure equalised with the pressure of the atmosphere = 494 L.

The balloon expands by am additional 475 L.

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Which element will be more reactive - Mg (magnesium) OR Se (Selenium)? *
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Answer:

magnesium

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magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive

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Rzqust [24]
I think the answer is increase; increase

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Answer:

I think the answer is c. It would have difficulty moving.

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