How does the Law of Conservation of Mass relate to changes in physical state? How does it relate to chemical changes?

Explanation:

• A compound is a unique substance that forms when two or more elements combine chemically.
• Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds.
• A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons.

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Answer:

D. None of the above

Explanation:

All the answer choices listed only have 2-3 items in the electron configuration.

Final answer:

The solutions having pOH=3.37, [h+]=3.8x10^-4 and pH=5.11 are acidic. Solutions with pOH=11.40, [OH-]=6.6x10^-3 and pH=12.94 are basic. The solution with [h+]=1.0x10^-7 is neutral. The solutions with [h+]=5.8x10^-8 and [OH-]=3.5x10^-12 are mildly acidic and basic respectively.

Explanation:

In an aqueous solution at 25 °C, the pH and pOH scales are defined so that water, which is neutral, has a pH of 7.00 and a pOH of 7.00. If the pH is less than 7, the solution is acidic. If the pH is greater than 7, the solution is basic. Hence, solutions with pOH=3.37 and [h+]=3.8x10^-4 are acidic, as they would have a pH lower than 7. The solutions with pOH=11.40, [OH-]=6.6x10^-3 and pH=12.94 are basic, as they would have a pH higher than 7. The solution with [h+]=1.0x10^-7 is neutral as it has a pH of 7. The solutions with [h+]=5.8x10^-8 and [OH-]=3.5x10^-12 are slightly acidic and basic respectively due to being close to the pH of 7. The solution with pH=5.11 is acidic as it's less than 7.

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Final answer:

The given solutions can be classified based on pH, pOH, [H+] and [OH-]. Based on these values, they are categorised as acidic, basic, or neutral.

Explanation:

The values provided are measures of the concentration of Hydronium ions [H+], hydroxide ions [OH-], pH, and pOH, which help determine whether a solution is acidic, basic, or neutral. At 25 degrees Celsius, a neutral solution has pH = 7, pOH=7, [H+] = 1.0x10^-7, and [OH-] = 1.0x10^-7. If the pH or [H+] is less than 7, or pOH or [OH-] is greater than 7, the solution is acidic. If the pH or [H+] is greater than 7, or pOH or [OH-] is less than 7, the solution is basic.

Applying this for each solution: pOH=3.37, acidic; pOH=11.40, basic; [H+]=3.8x10^-4, acidic; [H+]=5.8x10^-8, acidic; [OH-]=3.5x10^-12, acidic; [OH-]=6.6x10^-3, basic; [H+]=1.0x10^-7, neutral; pOH=7, neutral; pH=5, acidic; pH=12.94, basic.

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Answer:

the hydrogen end

Explanation:

In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.

• The bonds between H - F molecule is a covalent bond.
• In this bond, both atoms share their electrons to attain a stable configuration
• But the electrons are not shared equally.
• Fluorine is more electronegative compared to the hydrogen.
• Fluorine therefore, attracts the shared electrons more closely to itself.
• This makes fluorine more negative and hydrogen positive.

An 'amine' is an organic compound primarily composed of carbon(C), hydrogen(H) and nitrogen (N).

Ammonia is a molecule in which the N atom is attached to 3 H atoms, in addition there is a lone pair of electrons on the central N atom. Amines are essentially derivatives of ammonia where one of more H atoms have been replaced by an alkyl (R) or aryl(Ar) group

For example:

R-NH2 == primary amine

R2-NH == secondary amine

R3N == tertiary amine