Week 3 Practice Quiz Flashcards
During ionisation, water molecules disrupt the ionic bonds of a solute and a mixture of ions is produced. These ions are called A) cations B) anions C) dissociates D) electrolytes E) anti-ions
D) electrolytes
Which of the following statements about water is NOT correct?
A) is composed of polar molecules
B) is responsible for about 2/3 of the mass of the human body
C) has a relatively low heat capacity
D) can be considered a “universal solvent”
E) contains hydrogen bonds
C) has a relatively low heat capacity
If a molecule has two equal and opposite electrically charged poles separated by a short distance, it is said to be A) hydrophilic B) hydrophobic C) dipolar D) tripolar E) colloid
C) dipolar
In an aqueous solution, cations move toward A) water B) sodium C) potassium D) anions E) hydrogen ions
D) anions
In an aqueous solution, sodium would move toward A) potassium B) chloride C) sodium D) water E) A and B
B) chloride
A solution containing equal numbers of hydrogen ions and hydroxide ions is A) acidic B) basic C) neutral D) alkaline E) ionated
C) neutral
Which of the following substances would be least acidic? A) lemon juice, pH = 2 B) urine, pH = 6 C) tomato juice, pH = 4 D) white wine, pH = 3 E) stomach secretions, pH = 1
B) urine, pH = 6
If a substance has a pH that is greater than 7, it is A) neutral B) acidic C) alkaline D) a buffer E) a salt
C) alkaline
An important buffer in body fluids is A) NaCl B) NaOH C) HCl D) NaHCO3 E) H2O
D) NaHCO3
In the body, inorganic compounds A) can serve as buffers B) can make up proteins C) are important nutrients D) are structural components of cells E) both A and D
A) can serve as buffers
Hydrophilic molecules readily associate with A) lipid molecules B) hydrophilic molecules C) water molecules D) A and B E) all of the above
C) water molecules
Inorganic compounds that are soluble and whose ions will conduct an electrical current are called A) hydrophobic B) electrolytes C) covalent bond D) polar covalent molecules E) hydration spheres
B) electrolytes
A nanometer is A) 10-6 meter B) 10-8 meter C) 10-9 meter D) 10-10 meter E) 10-12 meter
C) 10-9 meter
An excess of hydrogen ions in the body fluids can have disastrous results because
A) excess hydrogen ions can break chemical bonds
B) excess hydrogen ions can change the shape of large complex molecules, rendering them nonfunctional
C) excess hydrogen ions can disrupt tissue function
D) all of the above
E) A and B only
D) all of the above
An inorganic compound, when placed in water, dissociates 99 percent forming hydrogen ions and anions. This substance would be A) a strong base B) a weak base C) a strong acid D) a weak acid E) a salt
C) a strong acid
When a small amount of hydrochloride acid is added to a solution of Na2HPO4, the pH of the solution does not change. The pH does not change when a small amount of NaOH is added either. Based on these observations, all of the following are true concerning the compound Na2HPO4, except
A) Na2HPO4 is able to accept extra hydrogen ions from the HCl
B) Na2HPO4 is able to donate hydrogen ions to the OH- from NaOH
C) Na2HPO4 absorbs excess H+ and OH- directly onto the surface of its crystalline structure
D) Na2HPO4 is a salt formed from reacting a strong base with a weak acid
E) Na2HPO4 acts as a buffer
C) Na2HPO4 absorbs excess H+ and OH- directly onto the surface of its crystalline structure
An acid A) dissociates into H+ ions and cations in water B) is a proton acceptor C) has a pH less than (<) 7 D) A and B are correct E) A, B and C are correct
C) has a pH less than (<) 7
A salt
A) dissociates into H+ and OH- in solution
B) prevents drastic changes in pH in body fluid
C) is a proton donor
D) is a product of the reaction of an acid with a base
E) is the product of a decomposition reaction
D) is a product of the reaction of an acid with a base
Which of the following never has an alkaline pH in a healthy person? A) gastric juice B) urine C) semen D) blood E) pancreatic juice
A) gastric juice
Buffers A) convert weak acids or bases into strong ones B) help destabilised pH C) can absorb OH- if the pH is too low D) can release H+ if the pH is too high E) include the HCl - KOH system
D) can release H+ if the pH is too high
Which of the following is TRUE regarding this situation: Solution A has a pH of 7.48 and Solution B has a pH of 7.39:
A) solution b is more acidic than solution a
B) the pH of solution A falls within the homeostatic pH range for extra cellular body fluids, but the pH of solution b does not.
C) solution A contains a higher concentration of hydrogen ions that solution B
D) solution B contains a higher concentration of hydrogen ions than solution A
E) Both B and C are correct
D) Solution B contains a higher concentration of hydrogen ions than Solution A
A common buffer found in extracellular fluid is A) glucose B) bicarbonate ion C) sodium ion D) a triglyceride E) ATP
B) bicarbonate ion
An acid has a pH ________ _________7
Less than
_______ are chemical compounds that help the body maintain homeostasis by preventing drastic changes in the pH of body fluids
Buffers
In a healthy person, the pH of blood is maintained by buffers in the range of _______ to _______.
7.35 to 7.45
