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yKpoI14uk [10]
3 years ago
7

(worth 10pts!!!!!!) What did Dmitri Mendeleev contribute to science? A. He arranged the first periodic table. B. He developed th

e first model of the atom. C. He discovered many unknown elements . D. He developed the first atomic theory
Chemistry
2 answers:
MAVERICK [17]3 years ago
6 0

Answer:

A.

Explanation:

vesna_86 [32]3 years ago
3 0

Answer:

A. He arranged the first periodic table.

Explanation:

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For the equilibrium
Mamont248 [21]

Answer:

Equilibrium concentrations of the gases are

H_2S=0.596M

H_2=0.004 M

S_2=0.002 M

Explanation:

We are given that  for the equilibrium

2H_2S\rightleftharpoons 2H_2(g)+S_2(g)

k_c=9.0\times 10^{-8}

Temperature, T=700^{\circ}C

Initial concentration of

H_2S=0.30M

H_2=0.30 M

S_2=0.150 M

We have to find the equilibrium concentration of gases.

After certain time

2x number of moles  of reactant reduced and form product

Concentration of

H_2S=0.30+2x

H_2=0.30-2x

S_2=0.150-x

At equilibrium

Equilibrium constant

K_c=\frac{product}{Reactant}=\frac{[H_2]^2[S_2]}{[H_2S]^2}

Substitute the values

9\times 10^{-8}=\frac{(0.30-2x)^2(0.150-x)}{(0.30+2x)^2}

9\times 10^{-8}=\frac{(0.30-2x)^2(0.150-x)}{(0.30+2x)^2}

9\times 10^{-8}=\frac{(0.30-2x)^2(0.150-x)}{(0.30+2x)^2}

By solving we get

x\approx 0.148

Now, equilibrium concentration  of gases

H_2S=0.30+2(0.148)=0.596M

H_2=0.30-2(0.148)=0.004 M

S_2=0.150-0.148=0.002 M

3 0
3 years ago
5. Which one of these species is an ion?
Maksim231197 [3]

The species that represents an ion is B³+ (option A).

<h3>What is an ion?</h3>

An ion is an atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.

Simply put, an ion is said to be an electrically charged atom. This refers to the difference in the number of protons and electrons in the atom of an element.

According to this question, the species with an electrical charge is B³+, hence, it represents an ion.

Learn more about ion at: brainly.com/question/14982375

#SPJ1

4 0
1 year ago
What is missing from this graph?<br><br> A. axis labels<br> B. a trendline<br> C. a title
Iteru [2.4K]

Answer:

Axis Labels

Explanation:

The axis labels are usually located on the x and y axis. This graph however is missing those.

hope this helps!

7 0
3 years ago
What is one fact you learned about the gases in our atmosphere that you did not know ? PLEASE HELP ! NEED DONE
Mandarinka [93]
Well that is up to you what did you not know but learned recently.
7 0
3 years ago
When discussing acids and bases any substance that accepts a patron by definition is considered an
vredina [299]

Brønsted-Lowry acid.

8 0
3 years ago
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