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3 years ago

Which of these is a compound? О co2, O2, Co

Chemistry

1 answer:

Ivanshal [37]3 years ago

8 0

Answer:

co2 is a compound.

Explanation:

Oxygen(O) is an element having atomic number 8 and mass number 16.

Carbondioxide is a compound formed by burning of carbon and organic compound and it is a colorless and odorless gas.

O2 is the molecular form of Oxygen.

Cobalt(Co) is an element having atomic number 27 and mass number 59.

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A hypothetical AX type of ceramic material is known to have a density of 3.55 g/cm3 and a unit cell of cubic symmetry with a cel

postnew [5]

Explanation:

For AX type ceramic material, the number of formula per unit cells is as follows.

$\rho = \frac{n'(A_{c} + A_{A})}{V_{C}N_{A}}$

or, $n' = \frac{\rho a^{3}N_{A}}{(A_{c} + A_{A})}$

where, n' = no. of formula units per cell

$A_{c}$ = molecular weight of cation = 90.5 g/mol

$A_{a}$ = molecular weight of anion = 37.3 g/mol

$V_{c}$ = volume of cubic cell = 3.55 $g/cm^{3}$

a = edge length of unit cell = $3.9 \times 10^{-8} cm$

$N_{A}$ = Avogadro's number = $6.023 \times 10^{23}$

$\rho$ = density = 3.55 $g/cm^{3}$

Now, putting the given values into the above formula as follows.

$n' = \frac{\rho a^{3}N_{A}}{(A_{c} + A_{A})}$

= $\frac{3.55 g/cm^{3} \times (3.9 \times 10^{-8})^{3} \times 6.023 \times 10^{23}}{(90.5 + 37.3)}$

= 0.9

= 1 (approx)

Therefore, we can conclude that out of the given options crystal structure of cesium chloride is possible for this material.

3 0

3 years ago

What would be the advantage of using a net ionic equation to represent a redox reaction

wolverine [178]

The net ionic equation is shorter to use and already leaves out the electrons that transferred from the reducing agent to the oxidizing agent. Also, in some occasions the aqueous ions H+ and (or) OH- ions that help balance the net ionic charge are no longer shown in the net ionic equation.

5 0

4 years ago

Without consulting any tables, arrange the following substances in order and explain your choice of order: (a) Mg21, Ar, Br2, Ca

Olenka [21]

Explanation:

(a) When we move across a period then there occurs a decrease in atomic size of the elements due to increase in force of attraction between the protons and electrons of an atom.

On the other hand, when we move down a group then there will occur an increase in atomic size of the elements due to increase in number of electrons which will also increase number of shells.

For example, Mg and Ca are group 2 elements, Br is a group 17 element and Ar is a group 18 element.

Hence, these are arranged in order of increasing radius as Ar < Br < Mg < Ca.

(b) Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.

Hence, order of increasing ionization energy for the given species is as follows.

Na < O < $Na^{+}$ = Ne

(c) Electronegativity is defined as the ability of an atom to attract electrons towards itself. When we move across a period then there occurs an increase in electronegativity of the atoms.

And, when we move down a group then there occurs a decrease in electronegativity of the atoms.

Therefore, for the given elements order of increasing electronegativity is as follows.

Al < H < O F

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3 years ago

If the pH is 9, what is the concentration of hydroxide ion? Is this solution

kogti [31]

Answer:

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3 years ago

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patriot [66]

Answer:

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Explanation:

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3 years ago

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