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iragen [17]
4 years ago
5

As you move across the period on the periodic table what pattern can be described about the electron configurations?

Chemistry
1 answer:
xeze [42]4 years ago
4 0

Answer:

Elements in the same period have same number of electronic shell and electron is increased by one in every coming element with in same electronic shell.

Explanation:

Consider the second period of periodic table. This period consist of eight elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.

Electronic configuration of lithium:

Li₃ = [He] 2s¹

Electronic configuration of beryllium:

Be₄ = [He] 2s²

Electronic configuration of boron:

B₅ = [He] 2s² 2p¹

Electronic configuration of carbon:

C₆ = [He] 2s² 2p²

Electronic configuration of nitrogen:

N₇ = [He] 2s² 2p³

Electronic configuration of oxygen:

O₈ = [He] 2s² 2p⁴

Electronic configuration of fluorine:

F₉ = [He] 2s² 2p⁵

Electronic configuration of neon:

Ne₁₀ = [He] 2s² 2p⁶

All these elements present in same period having same electronic shell and number of electron increased by 1.

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Physical Science Gas Laws Test
GrogVix [38]
<span>1. A gas occupies 4.31 litres at a pressure of 0.755atm. Determine the volume if the pressure is increased to 1.25 atm.

method: </span>Boyles Law<span>: P1/V1 = P2/V2
</span>P1/V1 = P2/V2 implies V2= P2 V1/ P1
V2=1.25x4.31 / 17=7.13L

<span>
2. 600 mL of a gas is at a pressure of 8.00atm. What is the Volume of the gas at 2 atm?

</span>method: Boyles Law: P1/V1 = P2/V2
P1/V1 = P2/V2 implies V2= P2 V1/ P1,
V1=2.6mL=0.026L
V2= P2 V1/ P1= 0.00065 L

<span>3. How hot will a 2.3 L balloon have to get to expand to a volume of 400 L? Assume that the initial temperature of the balloon is 25 degrees Celsius.

</span><span>Method: Charles Law: V1/T1 =V2/T2  Degrees Celcius + 273 = Kelvin
</span>
25 degrees Celsius=25+273=298K=T1

V1=2.3L, V2=400L

V1/T1 =V2/T2 implies T2=V2T1/V1=(400x298) /2.3=51826 K

<span>4. A gas takes up a volume of 17 litres, has a pressure of 2.3atm, and a temperature of 299K. If I raise the temperature to 350K and lower the pressure to 1.5atm, what is the new volume of the gas?
</span>
<span>Combined gas Law: (P1)(V1) =  (P2)(V2)
                                     (T1)           (T2)</span>

V1=17L
P1=2.3 atm
T1= 299K
P2=1.5 atm
T2=350 K
V2=?

 (P1)(V1) / T1=  (P2)(V2)/ T2
                                 
so V2= (P1)(V1) T2 / P2 T1
V2=17x2.3x350 /1.5 x 299= 30.51L
8 0
4 years ago
5. Two reactants combine to form a product in the reaction A + B -&gt; C. The rate of the reaction depends on the concentrations
Rina8888 [55]

Answer:

C. 2.

Explanation:

The total reaction order of this reaction is second order (2). For a second order reaction ,the rate  depends on two variable concentration terms which may or may not be same.

Given that:

Two reactants combine to form a product in the reaction  A + B → C

The above reaction is bimolecular as two molecules are involved in the reaction.

If C_A and C_B are the concentrations of A and B respectively at any time t, then assuming  that the reaction is of first order with respect to both A and B , the overall order is second and the reaction rate is given by:

\mathbf{\dfrac{-dC_A}{dt}=\dfrac{-dC_B}{dt}=k_2C__AC_B}

where;

\mathbf{k_2} = specific rate constant for a second order reaction and becomes the rate of the reaction when both C_A and C_B are unity.

4 0
3 years ago
Acetaldehyde shows two UV bands, one with a lmax of 289 nm ( 5 12) and one with a lmax of 182 nm ( 5 10,000). Which is the n p*
UkoKoshka [18]

Answer:

The bands are due to:

λmax = 289 nm n→π* transition (E = 12)

λmax = 182 nm π→π* transition (E=10000)

Explanation:

The two types of acetaldehyde transition are as follows:

n→π* and π→π*

From the attached diagram we have to:

ΔEn→π* < ΔEπ→π*

ΔEα(1/λ)

Thus:

λn→π* > λπ→π*

In n→π* spin forbidden, the intensity is low. Thus, the molar extinction E for n→π* is very low.

The same way, for π→π* spin allowed the intensity is high. Thus, the molar extinction coefficient E for π→π* is high too.

The bands are due to:

λmax = 289 nm n→π* transition (E = 12)

λmax = 182 nm π→π* transition (E=10000)

5 0
3 years ago
How do you calculate the Atomic Mass of an element?
Leno4ka [110]

Answer:

with the help of adding mass of protons and neutrons

Explanation:

measuring the atomic mass of an element , we add up the proton mass with the neutron mass it gives us the atomic mass

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4 years ago
Determine the mass of 4.20 moles of C6H12
Sergeu [11.5K]

Explanation:

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6 0
3 years ago
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