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3 years ago

10

What is the atomic number, mass number, element symbol, group number, and period number for oxygen?

1 answer:

yawa3891 [41]3 years ago

4 0

Answer:

Atomic no. = 8

Mass no. = 16

Period no. = 2

Group no. = 6

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3 years ago

7. A bicycle rider is traveling up a hill. When the rider reaches the top of the hill, she

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3 years ago

What would be the composition and ph of an ideal buffer prepared from lactic acid (ch3chohco2h), where the hydrogen atom highlig

Mashutka [201]

Answer:

$P_H =2.86$

$c=1.4\times 10^{-4}$

Explanation:

first write the equilibrium equaion ,

$C_3H_6O_3$ ⇄ $C_3H_5O_3^{-} +H^{+}$

assuming degree of dissociation $\alpha$ =1/10;

and initial concentraion of $C_3H_6O_3$ =c;

At equlibrium ;

concentration of $C_3H_6O_3 = c-c\alpha$

$[C_3H_5O_3^{-} ]= c\alpha$

$[H^{+}] = c\alpha$

$K_a = \frac{c\alpha \times c\alpha}{c-c\alpha}$

$\alpha$ is very small so $1-\alpha$ can be neglected

and equation is;

$K_a = {c\alpha \times \alpha}$

$[H^{+}] = c\alpha$ = $\frac{K_a}{\alpha}$

$P_H =- log[H^{+} ]$

$P_H =-logK_a + log\alpha$

$K_a =1.38\times10^{-4}$

$\alpha = \frac{1}{10}$

$P_H= 3.86-1$

$P_H =2.86$

composiion ;

$c=\frac{1}{\alpha} \times [H^{+}]$

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$[H^{+} ] =0.0014$

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$c=1.4\times 10^{-4}$

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3 years ago

If you were to travel from the surface to the center of Earth, the temperature would

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increase dramatically(a lot).

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The core of the earth is way way way hotter than the surface.

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3 years ago

An electron is the largest part of an atom. True or False?

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Answer: False

Explanation:

Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

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