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2 years ago

Convert 14.72 kg to ____ mg

Chemistry

1 answer:

navik [9.2K]2 years ago

6 0

Answer:

14720000

Explanation:

1 kg = 1000000 mg

14.72 kg = 14.72 x 1000000

=14720000

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When doing a recrystallization what observations would prompt you to perform a hot filtration?

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Answer is: because dissolved compounds can crystallizing from solution during filtration and forming crystals on the filter paper or funnel.
Recrystallization is a technique used to purify chemicals by dissolving both impurities and a compound in an appropriate solvent, either compound or impurities can be removed from the solution, leaving the other behind.

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3 years ago

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A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by the

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Answer:

The ionization energy (in kJ/mol) of the helium ion is 21,004.73 kJ/mol .

Explanation:

$E_n = -(2.18 10-18 J)\times \frac{Z^2}{n^2}$

Z = atomic mass

n = principal quantum number

Energy of the electron in n=1,

$E_1= -(2.18 10^{-18} J)\times \frac{4^2}{1^2}=-3.488\times 10^{-17} J$

Energy of the electron in n = ∞

$E_{\infty}= -(2.18 10^{-18} J)\times \frac{2^2}{\infty ^2}=0 J$

Ionization energy of the $He^+$ ion:

$I.E=E_{infty}-E_1=0-(-3.488\times 10^{-17} J)=3.488\times 10^{-17} J$

$I.E=3.488\times 10^{-20} kJ$

To convert in into kj/mol multiply it with $N_A=6.022\times 10^{23} mol^{-1}$

$I.E=3.488\times 10^{-20} kJ\times 6.022\times 10^{23} mol^{-1}=21,004.73kJ/mol$

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3 years ago

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What is the electron configuration of the element in period 2 that has 5 valence electrons (valence electrons are the electrons

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Answer:

Nitrogen

Explanation:

N= is the symbol

electronic configuration

1s2 2s2 2p3

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3 years ago

Which of the following statements holds true for a chemical change?

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Answer : The correct option is C.

Explanation :

Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.

The molecular structure of a substance changes in a chemical reaction is a chemical change.

Change in molecular structure means that there is a breaking and formation of bonds in a molecule.

The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.

The reaction of hydrogen with oxygen is,

$H_2(g)+O_2(g)\rightarrow 2H_2O(l)$

In this reaction, the H-H bond is break and O-H bond is form.

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3 years ago

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In the combined gas law, if the volume is decreased, what happens to the temperature if pressure remains constant?

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The correct answer is A. In the combined gas law, if the volume is decreased and the pressure is constant, then the temperature decreases.

P1V1/ T1 = P2V2 / T2

Assume the volume decrease by half; V2 = V1/2

P1V1/ T1 = P2V1 /2 T2

Cancelling terms,

1/T1 = 1/2 T2

T2 = T1/2

Thus, the temperature decreased.

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