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Pachacha [2.7K]
3 years ago
5

What would happen if a roof was made from wool?

Chemistry
1 answer:
vichka [17]3 years ago
7 0

Answer:

B

Explanation:

it will not be waterproof anymore

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Give the number of significant figures in this number: 7.8 x 10¹²
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The number is written in scientific notation.


The significant figures are the numbers known precisely plus 1 digit that is uncertain.


When the numbers are expressed in scientific notation all the digits before  10^n are significant.


So, 7 and 8 are significant figures and the answer is that the number of significant figures is 2.


Answer: 2
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Under the same conditions of temperature and pressure a liquid differs from a gas because the particles of the liquid
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liquid has more attraction between molecules. It takes energy to break these forces to change the liquid to a gas.

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Consider an atom having four distinct energy levels. If an electron is able to make transitions between any two levels, how many
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Energy levels are the electron shells where electrons are found at a fixed distance from the nucleus of the atom. The atom could emit 6 different wavelengths.

<h3>What is wavelength?</h3>

A wavelength is a distance between the adjacent crests in wave signals propagated in a system. Wavelength (\rm \lambda ) is in inverse relation to the frequency of the wave.

When an electron jumps from energy level 1 to 2, 1 to 3, and 1 to 4 one wavelength each is present. Hence, making the total wavelength to be 3, in transition from the first energy level.

Similarly, from energy levels, 2 to 3 and 2 to 4, a total of 2 wavelengths, and from energy levels 3 to 4 one wavelength is produced.

So the total different wavelengths of the radiation that can be emitted will be 3 + 2 + 1 = 6.

Therefore, 6 different wavelengths of radiation will be emitted by the atom.

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brainly.com/question/21419520

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