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ExtremeBDS [4]
3 years ago
12

Classify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals, or metallic cryst

als_______.(a) CO2(b) B12(c) S8(d) KBr(e) Mg(f) SiO2(g) LiCl(h) Cr
Chemistry
1 answer:
Scilla [17]3 years ago
5 0

Answer:

a) Molecular crystal

b) Molecular crystal

c) Molecular crystal

d) Ionic crystal

e) Metallic crystal

f) Covalent crystal

g) Ionic crystal

h) Metallic crystal

Explanation:

The bonds between the elements can be classified as ionic, covalent or metallic. The ionic bonds happen between a metal and a nonmetal, where the metal donates electrons and the nonmetal gain the electrons, forming ions. When this occurs, the solid formed is called ionic crystals, such as KBr and LiCl.

When the bond is between nonmetals, its called a covalent bond, and the nonmetals share pair of electrons. When a solid is formed, it can be called as covalent crystals or molecular crystals. The molecular crystals are formed by a determined number of electrons such as CO₂, Br₂ and S₈. On the other hand, the covalent crystals are polymolecular, such as the silica, SiO₂.

When metals do bonds between them, the bond is called a metallic bond, which can happen between atoms of the same element or different elements. The solid formed is called metallic crystal, such as Mg, and Cr.

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Calculate the unit cell edge length for an 87 wt% Ag- 13 wt% Pd alloy. All of the palladium is in solid solution, and the crysta
Goryan [66]

Answer:

Explanation:

   Since the crystal structure is FCC , every unit cell will have 4 atoms . If a be the edge length

average density = 4 x average atomic no / volume of unit cell x N

N is avogadro no or 6.02 x 10²³

average atomic no

= 100 / (87/107.9 +13/106.4) = 107.72

average density = 100 / (87/10.49 + 13/12.02)

= 10.667

10.667 = (4 x 107.72 )/ (a³x 6.02 x 10²³)

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8 0
3 years ago
What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K?
Natali5045456 [20]

Answer:

V = 25.7 L

Explanation:

To find the volume of Argon (Ar), you need to use the Ideal Gas Law equation. This looks like:

PV = nRT

In this formula,

        > P = pressure (atm)

        > V = volume (L)

        > n = number of moles

        > R = constant (0.0821 L*atm/K*mol)

        > T = temperature (K)

While there is a different constant that can be used if you want to keep the pressure in mmHg, there is a more common constant used when the pressure is in atm. So, to find the volume, you need to (1) convert mmHg to atm (by dividing by 760) and then (2) calculate the volume (using Ideal Gas Law).

<u>(Step 1)</u>

600 mm Hg              1 atm
-------------------  x  ---------------------  =  0.789 atm
                              760 mm Hg

<u>(Step 2)</u>

PV = nRT

(0.789 atm) x V = (0.825 mole)(0.0821 L*atm/K*mol)(300 K)

(0.789 atm) x V = 20.32

V = 25.7 L

5 0
2 years ago
In which state of matter would the molecules be closest together? a solid a cold liquid a warm liquid a gas?
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A solid.
As you slowly go from the solid state to the gas, the molecules within spread farther and farther away.
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