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Oliga [24]
3 years ago
8

Read the given expression. Effective nuclear charge = atomic number − X Which of the following explains the identity of X and it

s trends across a period?
Chemistry
1 answer:
antiseptic1488 [7]3 years ago
6 0

Explanation:

X- are the non-valence or shielding electrons in an atom. They are the electrons in an atom which excludes the inner orbital ones.

The valence electrons are the electrons in the outermost shell of an atom.

  Effective nuclear charge = Atomic number - Non-valence electrons.

  • The non-valence electrons are located inside of the main/inner electronic shell.  
  • The valence electrons are located outside the main shell.

For example, Neon:

  Atomic number = 10

  Electronic configuration   1s² 2s² 2p⁶

       Non-valence electrons =  1s² = 2 electrons

       Valence electrons = 2s² 2p⁶ = 8 electrons

The trend of the non-valence electrons across the periodic table:

Down a group, new electronic shells are added, this implies that the non-valence electrons increases down the group.

Across the period, the number of the non-valence electrons stays the same because no additional electronic shells are added.

Learn more:

Effective nuclear charge brainly.com/question/5441986

#learnwithBrainly

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How many moles of Co are needed to produce nine moles of CO2
inna [77]

Answer:

guizzes

Explanation:

guizlet

4 0
3 years ago
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If the theoretical yield of a reaction is 0.110 g and the actual yield is 0.104 g , what is the percent yield?
Westkost [7]
Theoretical Yield is an Ideal yield with 100 % conversion of reactant to product. It is in fact a paper work.

While,

Actual Yield is the yield which is obtained experimentally. It is always less than theoretical yield because it is not possible to have 100% conversion of reactants into products. Even some amount of product is lost while handling it during the process.

Percentage Yield is Calculated as,

                    %age Yield  =  Actual Yield / Theoretical Yield × 100

Data Given:
                   Actual Yield  =  0.104 g

                   Theoretical Yield  =  0.110 g

Putting Values,

                    %age Yield  =  0.104 g / 0.110 g × 100

                    %age Yield  =  94.54 %
3 0
3 years ago
A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder? 4.01 × 1022 molec
Semmy [17]
The answer is 9.03 × 10²⁴<span> molecules.

</span><span>Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance.
Make the proportion.
</span><span>6.02 × 10²³ molecules per 1 mol
</span>x per 15 mol

6.02 × 10²³ molecules : 1 mol = x : 15 mol
x = 6.02 × 10²³ molecules * 15 mol * 1 mol
x = 90.3 × 10²³ molecules
x = 9.03 × 10 × 10²³ molecules
x = 9.03 × 10²³⁺¹ molecules
x = 9.03 × 10²⁴ molecules
4 0
3 years ago
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A cylinder with a movable piston originally has a volume of 2805 mL and is filled with nitrogen to a pressure of 4.00
Sergio039 [100]

This problem is providing the initial volume and pressure of nitrogen in a piston-cylinder system and asks for the final pressure it will have when the volume increases. At the end, the answer turns out to be 2.90 atm.

<h3>Boyle's law</h3>

In chemistry, gas laws are used so as to understand the volume-pressure-temperature-moles behavior in ideal gases and relate different pairs of variables.

In this case, we focus on the Boyle's law as an inversely proportional relationship between both pressure and volume at constant both temperature and moles:

P_1V_1=P_2V_2

Thus, we solve for the final pressure by dividing both sides by V2:

P_2=\frac{P_1V_1}{V_2}

Hence, we plug in both the initial pressure and volume and final volume in order to calculate the final pressure:

P_2=\frac{2805mL*4.00atm}{3864mL}\\ \\P_2=2.90atm

Learn more about ideal gases: brainly.com/question/8711877

6 0
2 years ago
Read the chemical equation.
love history [14]

Answer:

A 2.8 liters

Explanation:

Step 1: Write the balanced equation

N₂ + 3 H₂ ⇄ 2 NH₃

Step 2: Establish the appropriate volume ratio

At the same temperature and pressure, the volume ratio of H₂ to NH₃ is 3:2.

Step 3: Calculate the volume of ammonia produced from 4.2 L of hydrogen

4.2 L H₂ × 2 L NH₃/3 L H₂ = 2.8 L

5 0
2 years ago
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