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Sonbull [250]
3 years ago
5

As stars get older, before they collapse, they throw off dust, heavy atoms and other materials an form a new

Chemistry
2 answers:
andre [41]3 years ago
7 0

Answer:

B or D

Explanation:

.....I'm pretty sure I earned on some kids tv show

sertanlavr [38]3 years ago
5 0
D I’m pretty sure sorry if it’s not right
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What is the molar concentration of 5% acetic acid?
larisa [96]

Answer:Vinegar Is 5% Acetic Acid And Its Molarity Is 0.833M.

Explanation:

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3 0
4 years ago
What is the percent composition by mass of each element in Co(HSO4)2?
MrRissso [65]

Answer:

54.1 % Ca, 43.2 % O, 2.7% H

Explanation:

Molecular formula for calcium hydroxide is Ca(OH)₂

As we don't have a mass of Ca(OH)₂ to find out the percentage composition, we consider that the question refers to 1 mol of compound.

1 mol of hydroxide weighs 74.08 g

1 mol of hydroxide has 1 mol of Ca, therefore 40.08 g are Ca

2 moles of O therefore 32g are O

2 moles of H therefore 2 g are H

Percentage composition is known as (Mass of element/Total mass) . 100

(40.08 / 74.08) . 100 = 54.1 %

(32 / 74.08) . 100 = 43.2 %

(2 / 74.08) . 100 = 2.7%

im a smart one

7 0
3 years ago
How do you solve this ?NH4+NO4->N2+O2+H2O2
ololo11 [35]
I'm assuming you wanted this equation balanced? If you typed it correctly, it's already balanced for you. :)
8 0
3 years ago
Which of the following choices contains the most thermal energy? a penny that is 20 degrees Celsius ( oC) an atom of aluminum th
jek_recluse [69]

Answer: a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)

Explanation:

Thermal energy is the energy possessed by an object by virtue of its temperature. The hotter the substance, the more its molecules vibrate, and therefore the higher its thermal energy.

Thermal energy refers to the sum of kinetic, potential, vibrational ,electronic and rotational energies of the object.

For bodies at same temperature, the body with more molecules will have more thermal energy due to more collisions.

6 0
3 years ago
Explain why potassium forms ions more easily than sodium
Evgesh-ka [11]
So potassium<span> is </span>more<span> reactive </span>than<span> lithium because the outer electron of a </span>potassium<span> atom is </span>further<span> from its nucleus </span>than<span> the outer electron of a lithium atom.</span>
7 0
4 years ago
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