High School Chemistry : High School Chemistry

Study concepts, example questions & explanations for High School Chemistry

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Example Questions

Example Question #3 : Definitions Of Acids And Bases

According to the Lewis definition, acids are __________.

Possible Answers:

hydrogen acceptors

hydroxide acceptors

electron pair acceptors

hydrogen donors

electron pair donors

Correct answer:

electron pair acceptors

Explanation:

According to the Lewis definition, acids are electron pair acceptors.

Example Question #1 : Definitions Of Acids And Bases

What is the Lewis definition of bases?

Possible Answers:

electron pair donors

increase the concentration of hydroxide ions in a solution

increase the concentration of hydrogen ions in a solution

electron pair acceptors

accept hydrogen ions

Correct answer:

electron pair donors

Explanation:

According to the Lewis definition, bases are electron pair donors. 

Example Question #1 : Acid Base Chemistry

What does amphoteric mean?

Possible Answers:

substance is highly basic

A substance can act either as an acid or a base

A substance that is highly acidic

A substance cannot act as an acid or a base

substance has a high concentration of neutrons

Correct answer:

A substance can act either as an acid or a base

Explanation:

An amphoteric substance is one that can act either as an acid or a base. Amino acids are good examples of amphoteric substances; they have a carboxylic acid group that can be acidic, and an amino group that can be basic.

Example Question #1 : Definitions Of Acids And Bases

What is a diprotic acid?

Possible Answers:

A really weak base

A really strong base

An acid with 2 ionizable hydrogens

An acid with 3 ionizable hydrogens

An acid with 1 ionizable hydrogen

Correct answer:

An acid with 2 ionizable hydrogens

Explanation:

Acids have hydrogen ions and balanced charges, "di" tells us that the acid in question has two potential hydrogen ions, which can be ionized and turned into protons (protic). These acids, like  can ionize once, yielding  then again, yielding .

Example Question #411 : High School Chemistry

What is a triprotic acid?

Possible Answers:

An acid that donates an electron pair

An acid that accepts an electron pair

An acid with three ionizable hydrogens

An acid with one ionizable hydrogen

An acid with two ionizable hydrogens

Correct answer:

An acid with three ionizable hydrogens

Explanation:

Acids have hydrogen ions and balanced charges. "Tri" tells us that the acid has three potential hydrogen ions. Once ionized, a hydrogen turns into a proton, hence, protic. An example of a triprotic acid is phosphoric acid 

Example Question #412 : High School Chemistry

What is a monoprotic acid?

Possible Answers:

A really weak base

An acid with two ionizable hydrogens

An acid with one ionizable hydrogen

An acid with three ionizable hydrogens

Any acid with more than 2 ionizable hydrogens

Correct answer:

An acid with one ionizable hydrogen

Explanation:

Acids have hydrogens that can dissociate into solution. In this case, the word "mono" tells us that there is only one potential hydrogen ion in that acid; so only one hydrogen ion can be ionized from that acid. A diprotic acid, such as  has two ionizable hydrogens.

Example Question #413 : High School Chemistry

What is a polyprotic acid?

Possible Answers:

An acid that increases the concentration of hydrogen ions in a solution

Any acid with more than two ionizable hydrogens

An acid with two ionizable hydrogens

An acid with three ionizable hydrogens

An acid with one ionizable hydrogen

Correct answer:

Any acid with more than two ionizable hydrogens

Explanation:

By definition, a polyprotic acid is one that has more than two ionizable hydrogens.

Example Question #11 : Acid Base Chemistry

Which of the following substances are amphoteric?

Possible Answers:

Correct answer:

Explanation:

Remember: amphoteric means that the substance can act as either an acid or a base. Using the Bronsted-Lowry definition of acids and bases (acids donate hydrogens and bases accept hydrogens) we find that  is the only compound that can give up a hydrogen (and be left with ), or accept a hydrogen (and become ).

Example Question #414 : High School Chemistry

According to the Arrhenius definition __________.

Possible Answers:

bases accept electron pairs

bases increase the concentration of hydroxide ions in a solution

acids are hydroxide donors

acids increase the concentration of hydroxide ions in a solution

acids accept electron pairs

Correct answer:

bases increase the concentration of hydroxide ions in a solution

Explanation:

According to the Arrhenius definition, bases increase the concentration of hydroxide ions in a solution.

Example Question #415 : High School Chemistry

According to the Arrhenius definition, acids __________.

Possible Answers:

Acids are hydrogen donors

Acids increase the concentration of hydroxide ions in a solution

Acids are proton acceptors

Acids are hydroxide donors

Acids increase the concentration of hydrogen ions in a solution

Correct answer:

Acids increase the concentration of hydrogen ions in a solution

Explanation:

According to the Arrhenius definition, acids increase the concentration of hydrogen ions in a solution.

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