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borishaifa [10]
3 years ago
14

What typically happens to a star after it becomes a white dwarf? Earth Science Help plz

Chemistry
1 answer:
Oksi-84 [34.3K]3 years ago
3 0
It starts to dim. I hope this helps you.
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If 59.3 grams of potassium chlorate decomposes, how many grams of oxygen gas can be produced?
KIM [24]
Moles of KClO₃ = 59.3 / (39 + 35.5 + 16 x 3)
Moles of KClO₃ = 0.48

Molar ratio of KClO₃ to O₂ = 2 : 3

Moles of O₂ produced = 1.5 x 0.48
= 0.72

Mass of O₂ = moles x Mr
= 0.72 x 32
= 23.04 grams
8 0
4 years ago
The ka value for acetic acid, ch3cooh(aq), is 1.8Ã 10â5 m. calculate the ph of a 1.40 m acetic acid solution.
kow [346]
1) Equlibrium reaction

CH3COOH (aq) = CH3COO(-) (aq) + H(+) (aq)

2) Equilibrium constant

Keq = Ka = [CH3COO-] [H+] / [CH3COOH]

3) Equilibrium concentrations

                  CH3COOH      CH3COO-     H+

start               1.40                  0              0
react                  x                   0              0
produced           0                   x              x

equilibrium     1.40 - x            x               x

=> Ka = x * x / (1.40 - x)

Approximation: given that Ka is very small x <<< 1,40 and 1.40 - x  ≈ 1.40

=> Ka ≈ x^2 / 1.40

=> x^2 ≈ 1.40Ka = 1.40 * 1.8 * 10^ - 5 = 2.52 * 10^-5

=> x ≈ √(2.52 * 10^-5) ≈ 5.02 * 10^ -3 M

4) pH = log 1 / [H+]

[H+] = x = 5.02 * 10^-3M

=> pH ≈ log (1 / 5.02 * 10^-3) ≈ 2.3

Answer: 2.3
3 0
3 years ago
What is the solution and solvent in Kool-Aid?​
alexandr402 [8]

In this solution the solvent is water and the solutes are sugar, artificial flavor and artificial color. Another interesting property of solutions is that different concentrations of solute can be made. As all of you are aware, you can make very sweet Kool Aid and less sweet Kool Aid.

5 0
2 years ago
Read 2 more answers
Why is cyanide ion negatively charged?
Bogdan [553]
The cyanide is CN^{-}
A carbon atom has 4 valance electrons and nitrogen has 5. Below is a Lewis-dot-structure of cyanide.
:N≡C.
The carbon atom is still one electron short of having a full octet and so it will seize another electron from almost anything, making the cyanide ion negative and whatever it took the electron from it now positive.
8 0
3 years ago
Which societal problem can be solved, in part, by scientists identifying areas of high biodiversity?
White raven [17]

the answer is not finding affordable housing, so that guy was wrong. Just a heads up

4 0
4 years ago
Read 2 more answers
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