What is the core notation for the electron configuratio

What is the core notation for the electron configuration of an aluminum ion?

a. [Ne]

b. [Ne] 2s2 2p1

c. [Ne] 3s2 3p1

d. [Ne] 3s2 3d1

e. None of these

Solution

Number of electron in Al = 13

Electronic configuration is 1s2 2s2 2p6 3s2 3p1

Noble gas having lesser electron than Al and closest to it is Neon (Ne)

Number of electron in Ne = 10

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If you receive a resistor with the bands in the followi

If you receive a resistor with the bands in the following order:

GREENBLACKGREENGOLD

what is the resistance of the resistor and its absolute uncertainty (tolerance)?

Solution

Resistance color code table

From the this data we can decode the resistance.

Resistance value = (50*100000 ± 5%) ohm = (5 ± 5%) Megaohm

Colour Digit Multiplier Tolerance
Black 0 1
Brown 1 10 ± 1%
Red 2 100 ± 2%
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A stuntman is being pulled along a rough road at a cons

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 112 kg, and the coefficient of kinetic friction between the road and him is 0.638. Find the tension in the cable.

Solution

Tension would be equal to the Frictional Force because there is no acceleration. [coefficient of friction k = 0.638]

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If we have a flooding small river and we have a dam wit

If we have a flooding small river and we have a dam with 2 gates each the dam gate length is 3.25 inches and the 2.25 inches . How long it going to be take to get the dam full ? The dam volume is 638.2013 inches cube.

If we have a flooding small river and we have a dam with 2 gates each the dam gate length is 3.25 inches and the 2.25 inches . How long it going to be take to get the dam full ? The dam volume is 638.2013 inches cube.

Solution

Area of each gate= 3.25*2.25 inch^2= 7.31 inch^2

Area of both gates, A= 14.62 inch^2

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– ENTROPY AND FREE ENERGY -Using reaction free energy t

– °ENTROPY AND FREE ENERGY -Using reaction free energy to predict equilibrium composition Consider the following equilibeium: Now suppose a reaction vessel isfiled with 0.151 atm of chlorine (C2) and 1.27 atm of nitrosyl chloride (NOCI) at 235. °C. Anwrhefolowing questions about this system: Under these coeditions, will the pressure of C12 temd to rise or fall rise all ls it possible to reverse this tendency by adding NO ln other wonds, if you said the pressure of Cl, will tend to rise, can that be charged to a bc changed to atendency to rise by adding NO If you said the lendency can be reversed in the second question,calculate the minimam of NO neoded to revene i Round your mwer so 2 sigc g

Solution

under these conditions pressure of Cl2 tend to rise

yes , it is possible to reverse the tendency by adding NO

DG0 = – RTlnk

-41*10^3 = -8.314*508.15lnkp

Kp = 1.64*10^4

Kp = pNOCl^2/pNO^2*pCl2

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A complete series circuit consists of a 12.0 V battery,

A complete series circuit consists of a 12.0 V battery, a 4.70 resistor, and a switch. The internal resistance of the battery is 0.30 o. The switch is closed. What does an ideal voltmeter read when placed across the terminals of the switch? 2.40 V 11.3 V zero 5.00 V

Solution

see.. there is no voltage drop in switch becoz switch has zero resitance

It would be zero

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In the circuit represented by the diagram, each of the

In the circuit represented by the diagram, each of the 4 resist has a resistance of 180.0Ohm. What is the equivalent resistance of the circuit? 540.0 o 720.0 o 180.0 o 450.0 o

Solution

Right two resistors in parallel = 180 / 2 = 90 ohm

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A 26.4 g sample of aluminum at 100.0C is added to 100.0

A 26.4 g sample of aluminum at 100.0C is added to 100.0 g of water at 21.7C in a constant pressure calorimeter. What is the final temperature of the water in C?

Solution

Png in not attached here,

lets continue

Energy is conserved

heat lost of aluminium = heat gain by water

CpAl = 0.902 J/g.oC

they both will reach an equilibrium temperature T

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1. Calculate the initial pH of a buffer produced when m

1. Calculate the initial pH of a buffer produced when mixing 100 ml of 0.20 M HCHO2 and 100 mL of 0.15 M NaCHO2. Then calculate the final pH of the buffer after 10 mL of.2 M NaOH is added. Ka 1.8 x 104 2. When making a buffer, which of the following acids can be used? a) HCIo b) HF c) H2SO4 d) HNO3

Solution

Q1

pH initially

pH = pKa + log(A-/HA)

pKa = -log(Ka) = -log(1.8*10^-4) = 3.75

pH = pKa + log(A-/HA)

pH = 3.75+ log(0.15/0.20)

pH = 3.625

after adding:

mmol of acid = MV = 100*0.2 = 20

mmol of conjguate = 100*0.20 = 20

after NaOH:

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If the material is in a solid, liquid, or gaseous state

If the material is in a solid, liquid, or gaseous state and the equilibrium vapor pressure of the solid and liquid is known as a function of temperature, what data is additionally required to draw the state diagram?

Solution

Other properties can be drawn in phase diagram are Specific volume(V),Specific entholopy(H) and entropy(S).

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