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Mila [183]
3 years ago
7

How does  a star form?

Chemistry
2 answers:
____ [38]3 years ago
8 0

in a star-forming area when a star passes of a supernova happens nearby the matter clumps together and gets so hot that the hydrogen fuses with others to get helium.
Bezzdna [24]3 years ago
7 0
A star froms when gravity pulls out a large cloud of matter is pulled of of a part of earth forming a star 
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How many moles of Boron (B) are in 5.03 x 1024 B atoms?
goldfiish [28.3K]

Hey there!:

Number of moles =   ( number of atoms / 6.023*10²³ atoms )

given number of atoms = 5.03*10²⁴

Therefore:

Number of moles B = 5.03*10²⁴ / 6.023*10²³

Number of moles B = 8.35 moles

Hope that helps!


3 0
3 years ago
Explain why soap needs to be used to clean clothes and why you can’t just use water alone?
Deffense [45]

Answer:

Water alone can't clean clothes because it won't attach to molecules of grease and dirt.

Explanation:

The surfactants it contains are made of molecules that have two different ends. One end is strongly attracted to water; the other is attracted to oily substances like grease.

5 0
3 years ago
Read 2 more answers
The form of heat transfer taking place in the crust of the earth would be ____
Anna [14]
The form of heat transfer taking place in the crust of the Earth would be Convection.
7 0
3 years ago
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A rectangular block has the following dimensions: 3.21 dm, 5.83 cm, and 1.84 in. The block has a mass of 1.94 kg. What is the de
spin [16.1K]

The density of the rectangular block in g/mL is 7.0.

<u>Given the following data:</u>

  • Mass of block = 22.8 gra1.94 kg
  • Length of block = 3.21 cm
  • Width of block = 5.83 cm
  • Height of block = 1.84 in.

To find the density of the block in g/mL:

First of all, we would determine the volume of the rectangular block by using the following formula:

Volume = length × width × height

<u>Conversion:</u>

1 in = 2.54 cm​

5.83 in = X cm

Cross-multiplying, we have:

X = 2.54(5.83)\\\\X = 14.81 \; cm

Volume = 3.21 × 5.83 × 14.81

Volume = 277.16 cubic centimeters.

<u>Note</u>: Milliliter (mL) is the same as cubic centimeters.

1000 grams = 1 kg

Y grams = 1.94 kg

Cross-multiplying, we have:

Y = 1940 grams

Now, we can find the density:

Density = \frac{Mass}{Volume}\\\\Density = \frac{1940}{277.16}

<em>Density </em><em>= 7</em><em>.0 g/mL</em>

Therefore, the density of the rectangular block in g/mL is 7.0.

Read more: brainly.com/question/18320053

4 0
3 years ago
Why is refraction so important in eyeglasses.
miss Akunina [59]
It helps our eyes to see better. For example: If you can't read a book because you see that is blurry, you might need glasses to see it much clearer
7 0
2 years ago
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