Quiz Answers
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| Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? | 10^-4, the solution is always equal to the negative exponent of the pH scale
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| Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxide ion concentration of this lake? | this question is looking for the concentration of OH- (Hydroxide)
the H+ balance is 10^-4 so the OH- must add up to 14. So the concentration would be 10^-10
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| As the pH lowers on the scale | the hydrogen levels (H+) go down.
the Hydroxide levels (OH-) go up.
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| As the pH raises on the scale | the hydrogen levels (H+) go up.
the Hydroxide levels (OH-) go down.
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| Which of the following statements is true about buffer solutions? Answer | They maintain a relatively constant pH when either acids or bases are added to them.
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| Buffer Solutions | are used as a means of keeping pH at a nearly constant value in regards to acids and bases
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| Which of the following solutions has the greatest concentration of protons, [H+]? | gastric juice at pH 2 (this is simple because the lower the pH the higher the acid level)
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| What is the pH of a solution with a hydroxide ion, [OH-], concentration of 10-12 M? | this is another one of those "must be 14" questions. ph 2 = 10^-2.
2=12=14
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| Amino acids are acids because they always possess which functional group? | carboxyl
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| One of the following people set up a closed system to mimic Earth's early atmosphere and discharged electrical sparks through it. A variety of organic compounds common in organisms were formed. Who did this? | Stanley Miller
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| enantiomers | -must have 4 different elements
-must be a mirror image
-letter arrangement doenst matter
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| Which two functional groups are always found in amino acids? | carboxyl and amino
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| What is the pH of a solution with a proton, [H+], concentration of 10-8 M? Answer | pH 8
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| Which of the following solutions has the greatest concentration of hydroxide ions, [OH-]? | the hydoxide concentration increases the higher the pH level
pH 8 would be have higher levels than pH 2
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| Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? | Testosterone and estradiol have different functional groups attached to the same carbon skeleton.
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| Early 19th-century scientists believed that living organisms differed from nonliving things as a result of possessing a "life force" that could create organic molecules from inorganic matter. The term given to this belief is | vitalism
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| At what temperature is water at its densest? | 4 degrees c
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| What gives rise to the cohesiveness of water molecules? | hydrogen bonds
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| The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called? | a hydrogen bond
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| If the pH of a solution is increased from pH 5 to pH 7, it means that the | pH of the solution should have decreased from 10^-5 to 10^-7 therefore the OH- levels should be higher and the H+ level should be 100 times less due to the move of the decimal point
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| Different atomic forms of an element contain the same number of protons but a different number of neutrons. What are these different atomic forms called? | isotopes
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| About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? | carbon, hydrogen, nitrogen, oxygen
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| What is the difference between covalent bonds and ionic bonds? | bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms.
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| Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates? | iodine
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| The reactivity of an atom arises from | the existence of unpaired electrons in the valence shell.
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| A covalent bond is likely to be polar when | one of the atoms sharing electrons is much more electronegative than the other atom.
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| Prokaryotic and eukaryotic cells generally have which of the following features in common? | DNA as their genetic material
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| Which of the following is reflective of the phrase "the whole is greater than the sum of its parts"? | reductionism
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| Which branch of biology is concerned with the naming and classifying of organisms? | taxonomy
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| The lowest level of biological organization that can perform all the activities required for life is the | cell
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| 2. Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? | Each hydrogen atom has a partial positive charge
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| 4. Which of the following statements is false? | Protons and electrons are electrically charged particles. Protons have one unit of negative charge, and electrons have one unit of positive charge
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| 9. Which of the following results from a transfer of electron(s) between atoms? | ionic bond
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| 11. Which of the following statements concerning prokaryotic and eukaryotic cells is not correct? | Prokaryotic cells contain small membrane-enclosed organelles.
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| Prokaryotic and eukaryotic cells generally have which of the following features in common? | cellular membrane
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