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Veseljchak [2.6K]
3 years ago
15

Will give brainliest if right:

Chemistry
1 answer:
VikaD [51]3 years ago
4 0

The answer here is B: Max Planck

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One crystalline form of silica (SiO2) has a cubic unit cell, and from X-ray diffraction data it is known that the cell edge leng
Sav [38]

Answer:

8 Silicon atom are present in unit cell.

16 oxygen atoms are present unit cell.

Explanation:

Number of atoms in unit cell = Z =?

Density of silica = tex]2.32 g/cm^3[/tex]

Edge length of cubic unit cell = a  = 0.700 nm = 0.700\times 10^{-7} cm

1 nm=10^{-7} cm

Molar mass of Silica  = 28.09 g/mol+16.00\times 2=60.09 g/mol

Formula used :  

\rho=\frac{Z\times M}{N_{A}\times a^{3}}

where,

\rho = density

Z = number of atom in unit cell

M = atomic mass

(N_{A}) = Avogadro's number  

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

2.32 g/cm3=\frac{Z\times 60.09 g/mol}{6.022\times 10^{23} mol^{-1}\times (0.700\times 10^{-7}cm)^{3}}

Z = 8

1 silicon is 2 oxygen atoms. then 8 silicon atoms will be 16 oxygen atoms.

5 0
3 years ago
Help me with this pleaseeeeeee
stiks02 [169]

Magnesium oxide is an ionic compound with a very high melting point and which requires a large amount of energy for melting.

<h3>What are ionic compounds?</h3>

Ionic compounds are compounds which are formed between oppositely charged ions which are held together by electrostatic forces of attraction between the oppositely charged ions.

Ionic compounds are formed when metal atoms donate electrons to non-metals atoms to form ions.

Magnesium oxide is an ionic compound.

The nature of bonding is ionic bonding.

It has a crystalline lattice structure.

The forces of attraction is electrostatic forces of attraction.

It has a high melting point of 2,852 °C, and thus requires a large amount of energy go melting to occur.

Therefore, magnesium oxide is an ionic compound which requires a large amount of energy for melting.

Learn more about ionic compounds at: brainly.com/question/11638999

3 0
2 years ago
Given the chemical equation, CaCl2 + Na → NaCl + Ca. The best description of this equation is which of these?
SpyIntel [72]

Answer:

An unbalanced single replacement reaction

4 0
4 years ago
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Which sentence describes existing cells?
Irina18 [472]
Hdhzhhw bzJijw d diaiwor
3 0
3 years ago
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How many total atoms are in 3(SO)4
hammer [34]

Answer:

17 atoms are in 3(SO)4

Explanation:

7 0
3 years ago
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