ZnS has two common polymorphs: Sphalerite and Wurtzite. Based on the analysis of Medelung constants alone, predict which polymorph should be more stable. Assume that the Zn-S distances in the two polymorphs are identical.
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Answer:
Wurzite has a higher Madelung constant when compared with Sphalerite therefore Wurizite is more stable.
Explanation:
Zinc Sulphide is a chemical compound that exhibits polymorphism. This means Zinc Sulphide can exists in different forms as a compound. Zinc Sulphide has two common polymorphs named; Wurtzite and Sphalerite .
This two polymorphs are crystalline in structure. Wurtzite is hexagonal in shape while Sphalerite is cubic in shape.
Madelung constant was named after German Physicist Erwin Madelung. Madelung constant is dependent on the the way ions are arranged in a solid substance or molecule. It is used to calculate the amount of energy required to move an ion from one point to the another in a crystal substance.
Madelung constant for Wurtzite is 1.64132 and for Sphalerite is 1.63806. Due to the fact that Wurtzite has a slightly higher Madelung constant that Sphalerite, it tends to be more stable than Sphalerite.
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The mass percent of the solute present is 99.7%.
What is mass percent?
The term mass percent refers to the ratio of the mass of solute to the mass of the solution multiplied by 100.
We have the following information;
volume of the water = 0.250 liters
Mass of the water = 0.250 g
Mass of the solute = 75 grams
Mas of solute and solvent = 0.250 g + 75 grams = 75.250 g
Mass percent of the solute = 75 grams /75.250 g * 100 = 99.7%
Learn more about mass percent: brainly.com/question/1190311
(75.0g/250mL)•100 = 30.0% solute
b. Iconic cycle
c. Neonic cycle
d. Water cycle
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This best fits choice (4).
b. N₂O₃
c. NO₂
d. NO
e. N2₂O
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43,89g≈44g
44g == 2x 14g (N) + 1x 16x(O)
M N₂O = 44g
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The equation for power is,
Power
Where P is power is Watts
I is current in Amperes
V is voltage in volts
Given, power of the camcorder = 16 Watts
Output voltage from its battery = 8 Volts
Calculating the current in Amperes from power and voltage,
I =
= 2 A
Therefore the current used will be 2 A.
Power is defined as product of current multiplying voltage, that is
P=I×V
Here, P is the power,
I is the current
While V is the voltage
Here,
P is 16 watt
V is 8 volt
I is the current, that needs to be determined,
Putting the values in the equation
16=I× 8
I=2
So, When a camcorder has a power rating of 16 watts. If the output voltage from its battery is 8 volts, what current is 2 A
Answers
The elements react with other element and form compounds in order to complete their octet (possess 8 electrons in their valence shell) and attain stability. The formation of compounds by the elements can take place by either sharing of electrons or transfer of electrons from one atom to other atom. The elements whose octet is complete that means those elements which has eight electrons in their valence shell are nonreactive as they are already stable due to completion of octet.
In periodic table, the elements of group 18 (Noble gas) have their octet completely filled and are stable in the elemental form. Thus, the elements of group 18 (helium, neon, argon, krypton, xenon, radon, and oganesson) are nonreactive.
Final answer:
The noble gases in Group 18 are nonreactive due to their filled valence shells, but exceptions to this rule have been discovered
Explanation:
The elements in Group 18, also known as the noble gases (helium, neon, argon, krypton, xenon, and radon), are nonreactive. They have filled valence shells, which makes them stable and unreactive. However, it's important to note that this assumption was proven false by Dr. Neil Bartlett in 1962 when he discovered that some noble gases can react under certain conditions.
Thus, these specific gases are a group of chemical elements found in Group 18 of the periodic table and are typically characterized by their overall stability and lack of reactivity, making them useful in applications like lighting, lasers, and cryogenics.
Learn more about nonreactive elements in Group 18 here:
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