As you know, water mixes with other compounds to form a variety of mixes. Which of the following would best describe a mix where the particles are not dissolved but will precipitate out?
a colloid
a solution
a suspension
a solute
The Correct Answer is C
A. a colloid: A colloid has larger particles than a solution, but they do not settle out (e.g., milk).
B. a solution: In a solution, particles are completely dissolved and remain evenly distributed (e.g., salt water).
C. a suspension: In a suspension, particles are large, do not dissolve, and will settle out over time (e.g., muddy water).
D. a solute: A solute is a substance dissolved in a solvent-not a type of mixture.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. presence of enzymes: Enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. decreased concentration of reactants: Lower concentration means fewer collisions between molecules, which slows reaction rate.
C. lower activation energy: Lowering the activation energy makes it easier for reactants to form products, increasing reaction rate.
D. A & B: While A is correct, B is not.
E. A & C: Both enzymes and reduced activation energy increase reaction speed.
Correct Answer is A
Explanation
A. As body temperature rises, sweating occurs to cool the body:
An example of negative feedback, where the body counters a change to restore normal state.
B. After drinking large amounts of water, urine output decreases to raise blood volume:
Urine output would actually increase to excrete the excess water and maintain volume.
C. Decreases in blood pressure cause a corresponding decrease in heart rate:
A decrease in blood pressure should cause the heart rate to increase (compensatory response).
D. As blood pressure falls, blood flow to the heart decreases:
The body usually increases heart rate and vasoconstriction to maintain cardiac output.
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