CHEMISTRY HIGH SCHOOL

4. How many protons are there in this atom?5. How many neutrons are there in this atom?
6. How many electrons are there in this atom?
7. What is the atomic weight of this atom?
8. Does the mass on the periodic table round to
the mass this atom has?
9. What atom is this?
9p+
10 n°
10. For each electron shown, write on the diagram to indicate which orbital (1s, 2s, 2p,...)
each electron is in.
11. Draw the orbital filling diagram for this atom. (Orbital filling is the thing with the boxes
and the arrows).
12. Write the electron configuration (1s"2s*) for this atom.
4. How many protons are there in this atom? 5. - 1

Answers

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What element has the electron configuration 1s2 2s2 2p6 3s2 3p2?

A sample of nitrogen occupies 10.0 liters at 25°C and 98.7 kPa. What would be the volume at 20°C and 102.7 kPa?

Answers

To solve the problem, we assume the sample to be ideal. Then, we use the ideal gas equation which is expressed as PV = nRT. From the first condition of the nitrogen gas sample, we calculate the number of moles.

n = PV / RT
n = (98.7x 10^3 Pa x 0.01 m^3) / (8.314 Pa m^3/ mol K) x 298.15 K
n = 0.40 mol N2

At the second condition, the number of moles stays the same however pressure and temperature was changed. So, the new volume is calculated as follows:

V = nRT / P
V = 0.40 x 8.314 x 293.15 / 102.7 x 10^3
V = 9.49 x 10^-3 m^3 or 9.49 L

The surface temperature on Venus may approach 737 K. What is this temperature in degrees Celsius?The temperature on Mercury may drop to –265 °F at night. What is this temperature in degrees Celsius?

Answers

Answer:

                  i)   737 K =  463.85 °C

                  ii)   -265 °F =  -165 °C

Solution:

Converting 737 K into °C :

                                          As we know Absolute zero (0K) is equivalent to -273. 15 °C. Hence,

                                               K  =  °C + 273.15

Or,

                                               °C  =  K - 273.15

Putting value of K,

                                               °C  =  737 - 273.15

                                               °C =  463.85 °C

Converting -265 °F into °C :

As,

                                               °F  =  °C × 1.8 + 32

So,

                                               °C  =  °F - 32 ÷ 1.8

Putting value of °F,

                                               °C  =  -265 - 32 ÷ 1.8

                                               °C = -165 °C
To convert K to C subtract 273.15. 

739K-273.15C= 465.85 C or approximately 466C

To convert F to C multiply by 1.8 and add 32.

so the answer is approximately -167 degrees celcius 

What is the value for ΔSºreaction for the following reaction, given the standard entropy values? Al2O3(s) + 3H2(g) → 2Al(s) + 3H2O(g) –35 J/mol*K +35 J/mol*/K +179 J/mol*K –179 J/mol*K

Answers

Let me help you by giving the formula as it will be more useful for you. delta S = Sum(n) (Delta S(products)) - Sum(m)(Delta S(reactants)). There are m and n in formula that are coefficients of the reactants and products that are given in the equation.

The answer is C just got it right

How many moles of copper are formed when 3.8 moles of zinc are mixed with copper (II) sulfate?

Answers

CuSO₄+ Zn = Cu + ZnSO₄

1 mole Zn ---------> 1 mole Cu
3.8 mole Zn ------> ?

moles Cu = 3.8 x 1 / 1

= 3.8 moles of Cu

hope this helps!

Final answer:

When 3.8 moles of zinc are mixed with copper (II) sulfate, the same number of moles of copper will be formed.

Explanation:

To determine the number of moles of copper formed when 3.8 moles of zinc are mixed with copper (II) sulfate, we need to consider the balanced chemical equation for the reaction.

Zn + CuSO4 → Cu + ZnSO4

The stoichiometry of the reaction tells us that 1 mole of zinc reacts with 1 mole of copper sulfate to produce 1 mole of copper. Therefore, if 3.8 moles of zinc are mixed with copper sulfate, the same number of moles of copper will be formed.

Learn more about moles of copper here:

brainly.com/question/32866556

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Which of the following is a measure of randomness in a system?A) entropy.
B) kinetic energy.
C) potential energy.
D) chemical energy.

Answers

Answer:

A) entropy

Explanation:

What would happen when a substance changes from one phase to another? A. The substance loses or gains heat. B. The average kinetic energy of the substance changes. C. The temperature of the substance changes. D. The molecular motion of the substance changes.

Answers

I think the correct answer from the choices listed above is option B. When a substance changes from one phase to another, the average kinetic energy of the substance changes since the molecules movements are changed as well. Hope this answers the question. Have a nice day.
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