Question 1

Oppositely charged ions in solution are prevented from combining by

Accepted Answer

Hydration spheres, also known as solvation shells, are formed around ions in solution due to the attraction between the ions and the polar water molecules. These hydration spheres prevent oppositely charged ions from coming into close proximity and combining.

Question 2

A(n)________ removes hydrogen ions and a(n)________ releases hydrogen ions.

Accepted Answer

The answer of A(n)________ removes hydrogen ions and a(n)________ releases...

Question 3

Which of the following substances would be most acidic?

Accepted Answer

Stomach secretions have the lowest pH value of 1, making it the most acidic substance among the options given.

Question 4

An excess of hydrogen ions in the body fluids can have fatal results because this can

Accepted Answer

An excess of hydrogen ions in the body fluids can indeed have fatal results for all the reasons listed. It can break chemical bonds, change the shape of proteins (denaturation), rendering them nonfunctional, disrupt tissue functions, and change body fluid pH, all of which are critical to maintaining homeostasis and proper physiological function.

Question 5

A solution containing equal numbers of hydrogen ions and hydroxide ions is

Accepted Answer

A solution containing equal numbers of hydrogen ions (H+) and hydroxide ions (OH-) is known as a neutral solution. Neutral solutions have a pH of 7.

Question 6

Which has the greater concentration of hydrogen ions,a substance with a pH of 5 or a substance with a pH of 4?

Accepted Answer

The lower the pH value, the greater the concentration of hydrogen ions. So a substance with a pH of 4 has a greater concentration of hydrogen ions compared to a substance with a pH of 5.

Question 7

When placed in water,an inorganic compound dissociates 99 percent,forming hydrogen ions and anions.This compound would be a

Accepted Answer

This compound is a strong acid because it dissociates almost completely in water, releasing a high concentration of hydrogen ions (H+).

Question 8

In the body,inorganic compounds

Accepted Answer

Inorganic compounds such as bicarbonate and phosphate ions can act as buffers in the body, helping to regulate pH.

Answer: D 
 Inorganic compounds such as calcium, phosphorus, and iron are important structural components of cells, including bones, teeth, and enzymes.

Answer: E 
 Inorganic compounds such as ATP (adenosine triphosphate) and NADH (nicotinamide adenine dinucleotide) are involved in cellular energy metabolism.

Therefore, the best choices are A, D, and E.

Question 9

During ionization,water molecules disrupt the ionic bonds of a salt to produce a mixture of ions.These ions can carry a current and so are called

Accepted Answer

Ions that can carry a current are called electrolytes. Electrolytes are essential for many biological processes and are found in body fluids such as blood and sweat.

Question 10

An example of an inorganic substance is

Accepted Answer

The answer of An example of an inorganic substance is
...

Question 11

If a substance has a pH that is greater than 7,it is

Accepted Answer

A pH greater than 7 indicates that the substance is basic or alkaline.

Question 12

Which pH is closest to normal body pH?

Accepted Answer

Normal body pH is around pH 7.4, which is closest to pH 7 on the given choices. Other choices are too basic or too acidic for normal body pH.

Question 13

When a small amount of HCl or NaOH is added to a solution of Na₂HPO₄,the pH of the solution barely changes.Based on these observations,all of the following are true concerning the compound Na₂HPO₄,except

Accepted Answer

Na₂HPO₄ is a salt formed from the reaction of a strong base (NaOH) with a weak acid (H₃PO₄). Since it is a salt, it can dissociate in water to release H⁺ and H₂PO₄⁻ ions. However, the pH of the solution barely changes upon addition of a small amount of HCl or NaOH, indicating that Na₂HPO₄ does not donate or accept extra hydrogen ions in solution. Instead, it may adsorb excess H⁺ and OH⁻ ions directly onto the surface of its crystalline structure. Therefore, choices A, B, D, and E are incorrect.

Question 14

The chemical notation that indicates concentration is represented as

Accepted Answer

The chemical notation that indicates concentration is represented as [ ]. It is used to indicate the molarity of a solution, meaning the number of moles of solute per liter of solution. For example, a 0.1 M NaCl solution means there are 0.1 moles of NaCl dissolved in every liter of the solution.

Question 15

Which of the following has the highest concentration of hydroxide ions?

Accepted Answer

A solution with a pH of 14 is considered basic, which means it has a high concentration of hydroxide ions (OH-).

Question 16

Of the following choices,the pH of the least acidic solution is

Accepted Answer

A solution with a pH of 12.0 is basic, not acidic. The higher the pH, the less acidic a solution is. Therefore, E is the least acidic option.

Question 17

Which of the following statements about water is false?

Accepted Answer

Water actually has a relatively high heat capacity, which means it can absorb and release a lot of heat before its temperature changes significantly. This property is important for regulating temperature in living organisms and for moderating climate on Earth.

Question 18

Which property of water helps keeps body temperature stabilized?

Accepted Answer

Thermal inertia is the property of water that helps to keep body temperature stabilized. This is because water has a high specific heat capacity, meaning it can absorb and retain a large amount of heat energy without experiencing a significant increase in temperature. As a result, when the body is too warm, the excess heat can be transferred to the water in the body and then released through sweating or other cooling mechanisms. Conversely, when the body is too cold, the water in the body can release heat energy to help raise the body's temperature.

Question 19

Hydrophilic molecules readily associate with

Accepted Answer

Hydrophilic molecules have an affinity for water molecules and readily associate with them.

Question 20

An important buffer in body fluids is

Accepted Answer

NaHCO₃ (sodium bicarbonate) is an important buffer in body fluids. It helps to maintain the pH of the body by acting as a weak base and reacting with excess acid in body fluids to form carbonic acid, which can then be easily excreted by the lungs.

Quiz 2: The Chemical Level of Organization

Oppositely charged ions in solution are prevented from combining by

A(n) removes hydrogen ions and a(n) releases hydrogen ions.

Which of the following substances would be most acidic?

An excess of hydrogen ions in the body fluids can have fatal results because this can

A solution containing equal numbers of hydrogen ions and hydroxide ions is

Which has the greater concentration of hydrogen ions,a substance with a pH of 5 or a substance with a pH of 4?

When placed in water,an inorganic compound dissociates 99 percent,forming hydrogen ions and anions.This compound would be a

In the body,inorganic compounds

During ionization,water molecules disrupt the ionic bonds of a salt to produce a mixture of ions.These ions can carry a current and so are called

An example of an inorganic substance is

If a substance has a pH that is greater than 7,it is

Which pH is closest to normal body pH?

When a small amount of HCl or NaOH is added to a solution of Na₂HPO₄,the pH of the solution barely changes.Based on these observations,all of the following are true concerning the compound Na₂HPO₄,except

The chemical notation that indicates concentration is represented as

Which of the following has the highest concentration of hydroxide ions?

Of the following choices,the pH of the least acidic solution is

Which of the following statements about water is false?

Which property of water helps keeps body temperature stabilized?

Hydrophilic molecules readily associate with

An important buffer in body fluids is

Quiz 2: The Chemical Level of Organization

Oppositely charged ions in solution are prevented from combining by

A(n) ________ removes hydrogen ions and a(n) ________ releases hydrogen ions.

Which of the following substances would be most acidic?

An excess of hydrogen ions in the body fluids can have fatal results because this can

A solution containing equal numbers of hydrogen ions and hydroxide ions is

Which has the greater concentration of hydrogen ions,a substance with a pH of 5 or a substance with a pH of 4?

When placed in water,an inorganic compound dissociates 99 percent,forming hydrogen ions and anions.This compound would be a

In the body,inorganic compounds

During ionization,water molecules disrupt the ionic bonds of a salt to produce a mixture of ions.These ions can carry a current and so are called

An example of an inorganic substance is

If a substance has a pH that is greater than 7,it is

Which pH is closest to normal body pH?

When a small amount of HCl or NaOH is added to a solution of Na₂HPO₄,the pH of the solution barely changes.Based on these observations,all of the following are true concerning the compound Na₂HPO₄,except

The chemical notation that indicates concentration is represented as

Which of the following has the highest concentration of hydroxide ions?

Of the following choices,the pH of the least acidic solution is

Which of the following statements about water is false?

Which property of water helps keeps body temperature stabilized?

Hydrophilic molecules readily associate with

An important buffer in body fluids is

A(n) removes hydrogen ions and a(n) releases hydrogen ions.