Metalloids are metallic-looking brittle solids<span> that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical </span>nonmetals<span> have a </span>dull<span>, coloured or colourless </span>appearance<span>; are </span>brittle<span> when </span>solid<span>; are poor conductors of heat and electricity; and have acidic oxides.</span>
Answer:
There is a 1:1 neutralization reaction, so, number of moles:
0.085 l * 0.900 mol/ L = 0.0765 mol HCL
The heat produced: 0.0765 mol * -56.2 kJ/mol = -4.229 kJ (this is the heat of neutralization)
Change in temperature: The mass to use in the equation Q=cmT.
4229 J / (4.186 J/gC*170 g) = 6.042 C
Add to the initial temperature:
18.24 + 6.042 = 24.29 C°
Answer:
d = all are premise of KMT.
Explanation:
A
Gas particles are extremely small and have relatively large distance between them.
B
Gas particles are continuously moving in random, straight-line motion as they are collide with each other and the container walls.
C
The average kinetic energy of gas particles is proportional to the temperature of gas.
All these are the premise of kinetic molecular theory. According to kinetic molecular theory, the particles pf gases are very small and randomly move in the available space. They move freely in straight line and colloid with each other and also the wall of container. This collision is elastic. As molecules strike with each other and walls of container their energy increases, and they gets warmer. So their kinetic energy is proportional to the temperature because mass of particle is constant.
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Answer:</h2>
Iron have unpaired 3d electrons.
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Explanation:</h2>
It can be explained by observing electronic configuration of the given elements.
- Zn- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s².
- Fe- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s².
- Ca- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².
- Ge- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p².
Where, Zn is zinc,
Fe is iron,
Ca is calcium and
Ge is germanium.
- 3d orbital have 5 sub shells which means it can carry 10 electrons.
- On observing electronic configuration of Zn, 3d orbital have 10 electrons and hence it is completely filled and no unpaired electrons in 3d orbital.
- On observing electronic configuration of Fe, 3d orbital have 6 electrons and hence have unpaired electrons (as five electrons will fill five sub shell of d orbital and the 6th electron will enter in first sub shell and get paired and the other 4 sub shell will have only one electron and hence will be unpaired).
- On observing electronic configuration of Ca it does not have 3d orbital and hence it is out of the case.
- On observing electronic configuration of Ge 3d orbital is completely filled with 10 electrons and hence is completely paired.
Result: Fe have unpaired 3d electrons.