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Leni [432]
3 years ago
9

What is the universe made of?

Chemistry
2 answers:
brilliants [131]3 years ago
7 0
Methane, nitrogen, dark matter, and radiation.
Marrrta [24]3 years ago
4 0
The universe is thought to be made 3 things: normal matter, dark matter, and dark energy.
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Explain the covalent and ionic bonds in polyatomic ionic compounds. Compare and explain the difference in melting point of a n-c
mestny [16]

Answer:

Explanation:

idk sucks 4 u

5 0
3 years ago
For some transformation having kinetics that obey the Avrami equation (Equation 11.17), the parameter n is known to have a value
Alex787 [66]

Answer:

t ≈ 235.47 secs

Explanation:

<u>Calculate how long it will take the transformation to go to 88% completion</u>

Given that Avrami equation ( <em>y </em>)= 1 - exp( - kt^n )

n = 2.3

t = 145 secs

reaction = 50%  after t = 145 secs

Reaction = 88%  after t = ?

attached below is a detailed solution

3 0
3 years ago
Find the volume. mass is 9.75 g and the density is 15.6 g/cm3​
Leni [432]

Answer:

1.6cm3

Explanation:

density = mass/volume

15.6g/cm3= 9.75 g/volume

15.6/9.75 = volume

1.6cm3 = volume

8 0
3 years ago
What is the mass of 5.7 x 1022 atoms Mn?
Svet_ta [14]

The mass of 5.2 x 10^22 manganese atoms in grams would be 635.784 grams.

What is Avogadro's constant?
Avogadro's number tells us how many particles are in one mole (or mol) of a substance. <u>Electrons</u><u>, molecules, or atoms</u> could be among these particles. Avogadro's number has a value of approximately 6.022140857×10²³ mol⁻¹. Avogadro's number tells us how many particles are in one mole (or mol) of a substance. <u>Electrons, molecules, or atoms </u>could be among these particles. Avogadro's number has a value of approximately 6.022140857×10²³.


Computation of mass
Avogadro calculated that every material had 6.022 x 10^23 atoms per mole.

5.2 x 10^22 atoms of Mn would contain how many moles?
= 6.022 x 10^23 /1 x 5.2 x10^22
=11.58 moles

Mn mass equals 11.58 moles multiplied by 54.9
= 635.784 grams

You may learn more about Avogadro's constant here: brainly.com/question/15989275
#SPJ10

6 0
1 year ago
How can you separate talc from water?
butalik [34]
Well to separate talc from water you can use the method of Filtration
 
and if you don't  know what Filtration is go to a dictionary for chemistry/Science 

or if you you have one then you could use it .

[hope this helps]

6 0
3 years ago
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