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3 years ago

Why do you think the transition metals are 10 columns wide?

2 answers:

4 0

The transition metals are 10 columns wide because they can hold no more than 10 electrons. This is why their width correlates with the number of electrons that are included in these metals. Transition metals include most commonly used metals, such as iron, copper, silver, and gold.

e-lub [12.9K]3 years ago

4 0

<span>Learning and teaching resource for Transition Metals written by PhD ... These d-block elements are the short columns in the center of the periodic ... The group 10 members are nickel (Ni), palladium (Pd), and platinum (Pt). ... elements do have low ionization energies, however, so they exhibit a wide ... Think of a magnet.</span><span>Transi</span>

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Use the following terms to fill in the blanks:

Alenkinab [10]

Answer:

1. Molality.

2. Concentration.

3. Percent by mass.

4. Mole fraction.

Explanation:

Molarity is the measurement by which the number of moles is measured by a solute. The solution here is one liter respectively.

Concentration is the product which is emerged when the amount of the solute is divided by the amount o the solvent or solution.

Mole fraction refers to the number of component moles divided by the number of the solution moles.

7 0

3 years ago

If the a of a monoprotic weak acid is 1. 2×10^−6. What is the [H] of a 0. 31 m solution of this acid?

Vanyuwa [196]

The pH of the solution of the given acid is 3.099

Let HX be the weak acid:

HX ⇌ $H^{+}$ + $X^{-}$

For which:

$K_{a}$ = [ $H^{+}$ ][ $X^{-}$ ] / [HX]

If $K_{a}$ lies in the range $10^{-4} - 10^{-10}$ we can assume that the equilibrium concentrations used in the expression are a good enough approximation to the initial concentrations.

Rearranging and taking negative logs of both sides gives:

pH = $\frac{1}{2} [pK_{a} - loga]$

a is the concentration of the acid.

$pK_{a} =-logK_{a}$ = -log (2× $10^{-6}$ ) = 5.69

pH = $\frac{1}{2} [5.69- (-0.508)]$

pH = 3.099

Learn more about pH of acid here;

brainly.com/question/13043236

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3 0

2 years ago

6 Which substances have atoms of the same element but different molecular structures?

Bezzdna [24]

Well you want the answer with the same letter in it. A.k.a 2. This means they have the same element in them
O2 (Diatomic oxygen that we breathe) and O3 (Ozone that would be deadly to breathe) have different structures.
So the answer is 2

8 0

3 years ago

Calculate the value of the diffusion coefficient D (in m2/s) at 547°C for the diffusion of some species in a metal; assume that

svetlana [45]

Answer : The value of diffusion coefficient is, $2.97\times 10^{-16}m^2/s$

Explanation :

Formula used :

$D=D_o\times \exp \left(-\frac{Q_d}{RT}\right )$

where,

D = diffusion coefficient = ?

$D_o$ = $5.6\times 10^{-5}m^2/s$

$Q_d$ = $177kJ/mol$

R = gas constant = 8.314 J/mol.K

T = temperature = $547^oC=273+547=820K$

Now put all the given values in the above formula, we get:

$D=5.6\times 10^{-5}m^2/s\times \exp \left(-\frac{177kJ/mol}{(8.314J/mol.K)\times (820K)}\right )$

$D=2.97\times 10^{-16}m^2/s$

Thus, the value of diffusion coefficient is, $2.97\times 10^{-16}m^2/s$

6 0

3 years ago

Which phrase is the best definition for the word common in environmental science?

andreev551 [17]

I believe that the best definition of the word common in environmental science is a typical resource. A typical resource is a resource that is not hard to find and is very common. The answer to the question will hence be A.
The answer could not be the other three choices because a shared resource is a resource that is used by more than one organism in the environment. A worthless resource is one that has no use in the environment while a rare resource is one that is hard to find.

7 0

3 years ago

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