Electrolytes and Dissociation in Water Quiz

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What is the primary mechanism by which water molecules move across cell membranes?

Osmosis driven by pressure gradients across semipermeable membranes

Active transport using ATP as an energy source

Simple diffusion driven by concentration gradients

Facilitated diffusion through aquaporin channels (correct)

Which hormone is primarily responsible for regulating water reabsorption in the kidneys?

Glucagon

Cortisol

Insulin

Antidiuretic hormone (ADH) (correct)

In the context of water dissociation, what is the significance of the equilibrium constant (Keq) value of 1.8 × 10^-16 at 25°C?

It suggests that water does not dissociate at all at 25°C.

It indicates that water is a strong electrolyte at 25°C.

It shows that water is a weak electrolyte and only partially dissociates at 25°C. (correct)

It means that water dissociates completely into ions at 25°C.

What condition is characterized by an inability to concentrate urine due to a deficiency or insensitivity to antidiuretic hormone (ADH)?

Diabetes insipidus (D) Signup and view all the answers

If water is a weak electrolyte, what can be inferred about the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in pure water at 25°C?

The concentrations of H+ and OH- are both low. (D) Signup and view all the answers

Which of the following statements about osmosis is correct?

Osmosis is the movement of water molecules across a semipermeable membrane from a region of higher solute concentration to a region of lower solute concentration. (B) Signup and view all the answers

Which of the following statements about aquaporin channels is correct?

Aquaporin channels are protein channels that facilitate the passive transport of water molecules across cell membranes. (B) Signup and view all the answers

What is the role of antidiuretic hormone (ADH) in water balance regulation?

ADH promotes water reabsorption in the kidneys, leading to decreased urine production. (C) Signup and view all the answers

Which of the following conditions is characterized by the inability to concentrate urine due to a deficiency or insensitivity to antidiuretic hormone (ADH)?

Diabetes insipidus (B) Signup and view all the answers

Which of the following statements about weak electrolyte dissociation is correct?

Weak electrolytes partially dissociate in water, forming a mixture of ions and neutral molecules. (C) Signup and view all the answers

Which of the following statements about osmosis is correct?

Osmosis is the diffusion of water molecules from a region of higher water concentration to a region of lower water concentration across a semipermeable membrane. (A) Signup and view all the answers

Which of the following is responsible for regulating water balance in the body by controlling the reabsorption of water in the kidneys?

Antidiuretic hormone (ADH) (C) Signup and view all the answers

In the context of weak electrolyte dissociation, what is meant by the term 'weak electrolyte'?

A substance that dissociates partially into ions when dissolved in water, with the extent of dissociation depending on the concentration. (B) Signup and view all the answers

What are aquaporin channels, and what is their role in osmosis?

Aquaporin channels are protein channels found in cell membranes that facilitate the diffusion of water molecules across the membrane, playing a crucial role in osmosis. (B) Signup and view all the answers

What is diabetes insipidus, and how is it related to the regulation of water balance in the body?

Diabetes insipidus is a condition characterized by excessive urination and increased thirst due to a deficiency or insensitivity to antidiuretic hormone (ADH), which leads to impaired water reabsorption in the kidneys. (B) Signup and view all the answers

Electrolytes and Dissociation in Water Quiz

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Questions and Answers

What is the primary mechanism by which water molecules move across cell membranes?

Which hormone is primarily responsible for regulating water reabsorption in the kidneys?

In the context of water dissociation, what is the significance of the equilibrium constant (Keq) value of 1.8 × 10^-16 at 25°C?

What condition is characterized by an inability to concentrate urine due to a deficiency or insensitivity to antidiuretic hormone (ADH)?

If water is a weak electrolyte, what can be inferred about the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in pure water at 25°C?

Which of the following statements about osmosis is correct?

Which of the following statements about aquaporin channels is correct?

What is the role of antidiuretic hormone (ADH) in water balance regulation?

Which of the following conditions is characterized by the inability to concentrate urine due to a deficiency or insensitivity to antidiuretic hormone (ADH)?

Which of the following statements about weak electrolyte dissociation is correct?

Which of the following statements about osmosis is correct?

Which of the following is responsible for regulating water balance in the body by controlling the reabsorption of water in the kidneys?

In the context of weak electrolyte dissociation, what is meant by the term 'weak electrolyte'?

What are aquaporin channels, and what is their role in osmosis?

What is diabetes insipidus, and how is it related to the regulation of water balance in the body?

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