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alexandr1967 [171]
3 years ago
11

Elements with atomic numbers 7 and 83 have how many valence electrons? *

Chemistry
1 answer:
IRINA_888 [86]3 years ago
5 0

Explanation:

element with atomic numbers 7 and 83 have 5 and 5 valence electrons

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I. Choose the letter of the correct answer. Write your answer on a separate sheet of paper.
omeli [17]

Answer:

,,,

Explanation:

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6 0
3 years ago
Steam reforming of methane ( CH4 ) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the sta
sertanlavr [38]

<u>Answer:</u> The pressure equilibrium constant for the reaction is 4.5\times 10^0

<u>Explanation:</u>

We are given:

Initial partial pressure of methane = 0.60 atm

Initial partial pressure of water vapor = 2.6 atm

Equilibrium partial pressure of hydrogen gas = 1.4 atm

The chemical equation for the reaction of methane gas and water vapor follows:

                     CH_4+H_2O\rightleftharpoons CO+3H_2

<u>Initial:</u>             0.60    2.6

<u>At eqllm:</u>       0.60-x  2.6-x     x       3x

Evaluating the value of 'x':

\Rightarrow 3x=1.4\\\\x=0.467

So, equilibrium partial pressure of methane gas = (0.60 - x) = [0.60 - 0.467] = 0.133 atm

Equilibrium partial pressure of water vapor = (2.6 - x) = [2.6 - 0.467] = 2.133 atm

Equilibrium partial pressure of carbon monoxide gas = x = 0.467 atm

The expression of K_p for above equation follows:

K_p=\frac{p_{CO}\times (p_{H_2})^3}{p_{CH_4}\times p_{H_2O}}

Putting values in above equation, we get:

K_p=\frac{0.467\times (1.4)^3}{0.133\times 2.133}\\\\K_p=4.517\times 10^0

Hence, the pressure equilibrium constant for the reaction is 4.5\times 10^0

8 0
3 years ago
The rock had a mass of 500g and a density of 10 g/cm3. What is the volume of the rock
NARA [144]

lets work back. The formula to find density is d= m/v. fill in the values you know.

10 = 500/v

well, we don't need to use a calculator. dividing by ten is going to the left once, and removing one value of ten.

this means you have a volume of 50. 

Hope this helps! :D


6 0
4 years ago
Who developed the concept that the total pressure of a mixture of gases is the sum of their partial pressures?.
victus00 [196]

Answer:

John Dalton

Explanation:

John Dalton developed the concept tittle: Dalton Law of Partial Pressure.

The formula is: Pt = Pa + Pb + Pc...... Pn

3 0
2 years ago
&gt;
DiKsa [7]

Answer:

It has a negative charge and is located in orbitals around the nucleus

Explanation:

5 0
3 years ago
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