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4 years ago

Which phrase best describes a covalent bond?

Chemistry

1 answer:

kotegsom [21]4 years ago

5 0

Answer: The correct answer is sharing of electrons.

Explanation:

Covalent bond is defined as the bond which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

For Example: Formation of hydrogen chloride molecule

Electronic configuration of hydrogen = $1s^1$

Electronic configuration of chlorine = $1s^22s^22p^63s^23p^5$

Hydrogen and chlorine atoms are need only 1 electron to attain stable electronic configuration. So, they share electron and form covalent bond.

Hence, the correct answer is sharing of electrons.

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3 years ago

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Describe at least 3 biotic and 3 abiotic factors found in that ecosystem and do not tell which ecosystem you chose

Andrew [12]

Abiotic factors are the non-living parts of the environment that can often have a major influence on living organisms. Abiotic factors include water, sunlight, oxygen, soil and temperature. Water (H2O) is a very important abiotic factor – it is often said that “water is life.” All living organisms need water.

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3 years ago

What is the charge of the neutron

elena55 [62]

Answer:

Neutral (no net charge)

Explanation:

Protons - Positive

Electrons - Negative

Neutrons - No charge

Why?

Neutrons are the particle in an atom with a (as the name suggests) neutral charge. They are neither positive nor negative, unlike protons or electrons.

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4 years ago

In a 0.100 m hf solution, the percent dissociation is determined to be 9.5%. calculate the ka for hf based on this data.

Elden [556K]

Answer : The dissociation constant (Ka) = 9.025 × $10^{-4}$

Solution : Given,

Concentration HF solution = 0.100 M

% Dissociation = 9.5 %

The equation for dissociation of HF is :

$HF \rightleftharpoons H^{+}+ F^{-}$

The Ka expression for HF is :

$Ka=\frac{[H^{+}][F^{-}]}{[HF]}$ ............. (1)

Step 1 : we find the $[H^{+}]$ by using the concentration and % dissociation.

$[H^{+}]$ = Concentration HF solution × % Dissociation

$[H^{+}]$ = 0.100 M × $\frac{9.5}{100}$ = 9.5 × $10^{-3}$ M

Step 2 : For $[F^{-}]$ , the concentration of $[F^{-}]$ is equal to the $[H^{+}]$ . From the above equation the stoichiometry of $[F^{-}]$ and $[H^{+}]$ is 1:1.

Therefore,

$[F^{-}]$ = $[H^{+}]$ = 0.100 M × $\frac{9.5}{100}$ = = 9.5 × $10^{-3}$ M

Now, put all the values in equation (1), we get

$Ka=\frac{(9.5\times10^{-3})\times(9.5\times10^{-3})}{(0.1)}$

= 9.025 × $10^{-4}$

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3 years ago

What is the difference between intensive & extensive phyiscal properties?

iVinArrow [24]

Answer:

Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.

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4 years ago