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Olegator [25]
3 years ago
5

Young stars, just beginning their life in the galaxy, would contain mostly

Chemistry
1 answer:
amm18123 years ago
6 0

Answer:Hydrogen and Helium

Explanation: Young stars would contain first hydrogen, then helium.

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Moldear una plastilina es un cambio fisico o quimico.
Andrews [41]

Fisico

Explanation:

esto es debido a que el mismo no modifica la estructura química de la misma. ... Cambios químicos: son aquellos que producen un cambio en la estructura molecular de una sustancia, por lo general se producen mediante una reacción

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4 years ago
All human body systems works together m. What would happen to someone if one of their systems becomes inefficient?
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They would most likely get sick. Or suffer from organ failure. When one part of your body doesn’t work it causes a weakness, making you more susceptible to sicknesses.
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3 years ago
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A solution of acetic acid has a pH of 3.45. What is the concentration of acetic acid in this solution? Ka for CH3COOH is 1.8×10-
Serjik [45]

Answer:

0.007 M

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,  

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

pH=-log(\sqrt{k_a\times C})

Where, C is the concentration = ?

Given, pH = 3.45

So, for CH_3COOH, K_a=1.8\times 10^{-5}

3.45=-log(\sqrt{1.8\times 10^{-5}\times C})

\log _{10}\left(\sqrt{1.8\cdot \:10^{-5}C}\right)=-3.45

C = 0.007 M

5 0
3 years ago
Kati was in the kitchen when she heard a crash. She went into her bedroom and found her window broken and a baseball lying on th
dimulka [17.4K]
B. inference because she drew a conclusion based on evidence.

Because the evidence was that she heard the crashing sound, and then when she came into her room saw the broken window and baseball.

It was not an observation because she did not directly see the baseball going through the window

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Which following substances is covalently bonded??
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Where are the substances?
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3 years ago
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