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3 years ago

What is the property of most metals

1 answer:

6 0

They have luster, good thermal and electrical conductivity, high densities and melting points, and are malleable. The only exception would be mercury most metals are solid at room temp

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For some hypothetical metal, the equilibrium number of vacancies at 900c is 2.3 1025 m3. if the density and atomic weight of thi

PSYCHO15rus [73]

Hey there!

The number of vacancies per unit volume => ( Nv = 2.3*10²⁵ m⁻³ )

Avogrado's number => ( NA = 6.022*10²³ atoms/mol )

Density of material ( p ) in g/m³ :

1 g/cm³ = 1000000 g/m³ so:

7.40 * ( 1000000 ) = 7.40*10⁶ g/m³

Atomic mass = 85.5 g/mol

* Calculate the number of atomic sites per unit volume :

N = NA * p / A

N = ( 6.022*10²³ ) * ( 7.40*10⁶ ) / 85.5

N = 4.45*10³⁰ / 85.5

N = 5.212*10²⁸ atoms/m³

Therefore:

Calculate the fraction of vacancies :

Fv = Nv / N

Fv = 2.3*10²⁵ / 5.212*10²⁸

FV = 4.441*10⁻⁴

Hope that helps!

5 0

3 years ago

Indicate whether the following balanced equations involve oxidation-reduction. Check all that apply. Check all that apply. 2H2SO

guapka [62]

Answer : The balanced equations involve oxidation-reduction are:

(a) $2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

(b) $3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

(c) $NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given chemical reaction is:

$2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

This reaction involve oxidation-reduction reaction because the oxidation state bromine changes from (-1) to (0) which shows oxidation and sulfur changes from (+6) to (+4) which shows reduction.

(b) The given chemical reaction is:

$3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

This reaction involve oxidation-reduction reaction because the oxidation state sulfur changes from (+4) to (+6) which shows oxidation and nitrogen changes from (+5) to (+2) which shows reduction.

(c) The given chemical reaction is:

$NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

This reaction involve oxidation-reduction reaction because the oxidation state iodine changes from (-1) to (+5) which shows oxidation and chlorine changes from (+5) to (-1) which shows reduction.

(d) The given chemical reaction is:

$PBr_3(l)+3H_2O(l)\rightarrow H_3PO_3(aq)+3HBr(aq)$

This reaction does not involve oxidation-reduction reaction because the oxidation state of element present on reactant and product side are same.

3 0

3 years ago

Read the given equation:

Assoli18 [71]

Answer:

HCl is acid

Ca(OH)2 is base

CaCl2 is salt

5 0

3 years ago

How can you form new neural pathways that will lead to transformed thinking and a transformed life?

aleksandr82 [10.1K]

When you understand how neural pathways are created in the brain, you ... But because I had the will to do it, I built a new pathway, and I rewired or reprogrammed my brain. ... can learn new behaviors and attitudes and can transform their lives. ... to the habit, and see what results you're creating in your life

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4 years ago

The school is 3,000 meters from the mall. What is the distance in kilometers?

Sonbull [250]

The distance will be 3km since 1000metres is equivalent to 1km

3 0

4 years ago