11. Why is HCl a strong acid and HClO a weak acid?

Answer:

b. Ni, Fe, Ti, K

Explanation:

The given elements are present in period 4 of periodic table. Now we will discuss the trend of atomic radius along period.

Atomic radius:

" It is the smallest distance from nucleus to the outer most valance shell of an atom"

When we move from left to right in the periodic table the number of valance electrons in an atom increase. The atomic size goes to decrease in same period because of edition of electron with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. In this way positive charge is also going to increase and this charge is greater in effect than the charge of electrons. This effect causes the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell come closer to the nucleus.

As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Ni ∠ Fe ∠ Ti ∠ K

Answer:

The number of particles in the 41.8g sample of Bismuth is 12.044 × 10²³

Explanation:

In a 15.5 g sample of bismuth there are 4.47 x 10²² atoms are present.

The term molar mass is defined as the ratio between the mass and the amount of substance of any sample of said compound. The molar mass is a property of a substance.

The molar mass of a compound can be calculated by adding the standard atomic masses in g/mol of the constituent atoms.

Given:

Mass of Bismuth  = 15.5g

Number of atoms  = ?

To find the number atoms, find the number of moles in this element first.

Number of moles  = mass/ molar mass

Number of moles  =  15.5g / 209    

= 0.074mole

1 mole of a substance contains 6.023 x 10²³ atoms

0.074 mole of Bismuth will contain 0.074 x 6.023 x 10²³ atoms

= 4.47 x 10²² atoms

Thus, 4.47 x 10²² atoms are found in a 15.5 g sample of bismuth.

To learn more about the molar mass, follow the link;

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Answer: Wind energy.

Explanation: Wind energy is the least harmful form of energy because unlike coal. It doesn't leave a big footprint. Although, to this date every form of energy still has a footprint, it just might not be big.

Answer:

Explanation:

Chromium nitrate Cr( NO₃ )₂

Chromium hydroxide Cr( OH)₃

Chromium oxide ( Cr₂O₃ )

1 mole of chromium nitrate will form 1 mole of chromium hydroxide

1 mole of chromium hydroxide will form one mole of chromium oxide .

Moles of chromium nitrate in 56 mL of .6 M solution

= .056 x .6 = .336 moles

.336 moles of chromium nitrate will produce .336 moles of chromium hydroxide and .336 moles of chromium hydroxide will produce .336 moles of chromium oxide .

So chromium oxide produced = .336 moles

Molecular weight of chromium oxide = 152

.336 moles of chromium oxide is equal to

.336 x 152 grams of chromium oxide

= 51.07 grams .

Answer:

A value that quantifies the distance traveled by a substance relative to the distance traveled by the solvent- Retention factor

The substance to which the sample is bound at the start of an experiment- stationary phase

The substance that carries the components of a mixture- mobile phase

Explanation:

The retention is defined as a value that quantifies the distance traveled by a substance relative to the distance traveled by the solvent. It shows us how effective a solvent is at separating a mixture.

The stationary phase is the the substance to which the sample is bound at the start of an experiment. The solvent pick up the substance to be analyzed from this stationary phase. The different components of the mixture are found to move up the stationary phase at different speeds, causing them to eventually  separate from each other.

The mobile phase is the substance that carries the components of a mixture during chromatography.

Divide the number of molecules N by avogadro's constant.

Let n be the number of moles then,

[tex]n=\frac{N}{N_A}=\frac{3.3\cdot10^{24}}{6.022\cdot10^{23}}=5.48\mathrm{mol}[/tex]

Hope this helps.