BIO 101 EXAM 1 NVCC ACTUAL EXAM 100 REAL
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED ANSWERS)
|ALREADY GRADED A+
chemical reaction - ANSWER- - the making and breaking of chemical bonds, leading to changes in the composition of matter
- all chemical reactions are reversible; products of the forward reaction
become reactants for the reverse reaction
Reactants - ANSWER- A starting material in a chemical reaction
Products - ANSWER- The elements or compounds produced by a chemical reaction.
Cohesive behavior - ANSWER- the ability for like molecules to "stick" together
Cohesion - ANSWER- Attraction between molecules of the same substance
Adhesion - ANSWER- An attraction between molecules of different substances
surface tension - ANSWER- the force that acts on the surface of a liquid and that tends to minimize the area of the surface 1 / 3
Ability to moderate temperature - ANSWER- The property of water that causes cities near large bodies of water to be cooler than cities that are inland
high specific heat - ANSWER- A property of water. Water can absorb lots of heat before changing temperature
high heat of vaporization - ANSWER- many hydrogen bonds must be broken for water to evaporate
evaporative cooling - ANSWER- The process in which the surface of an object becomes cooler during evaporation, a result of the molecules with the greatest kinetic energy changing from the liquid to the gaseous state.
Expansion upon freezing - ANSWER- ice floats in water because hydrogen bonds in ice are more "ordered" making ice less density
versatility as a solvent - ANSWER- The property of water that allows it to dissolve polar substances
Solvent - ANSWER- A liquid substance capable of dissolving other substances
Solutes - ANSWER- substance dissolved in a solution
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aqueous solution - ANSWER- a solution in which water is the solvent
Hydrophilic - ANSWER- Attracted to water
Hydrophobic - ANSWER- Having an aversion to water; tending to coalesce and form droplets in water.
pH scale - ANSWER- - measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
- acidic < 7
- basic > 7
- most biological fluids range from 6-8
Acids - ANSWER- compounds that form hydrogen ions when dissolved in water
Bases - ANSWER- Compounds that reduce the concentration of hydrogen ions in a solution.
buffer system - ANSWER- - the internal pH of most living cells must remain close to pH 7
- minimize changes in concentration of H+ and OH- in a solution
- contain a weak acid and a corresponding base
organic molecules - ANSWER- molecules that contain carbon
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