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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?
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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?
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BIOL149_CH1-5_Quiz
Quiz Answers
| Question | Answer |
|---|---|
| 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 |
| 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 |
| As the pH lowers on the scale | the hydrogen levels (H+) go down. the Hydroxide levels (OH-) go up. |
| As the pH raises on the scale | the hydrogen levels (H+) go up. the Hydroxide levels (OH-) go down. |
| 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. |
| Buffer Solutions | are used as a means of keeping pH at a nearly constant value in regards to acids and bases |
| 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) |
| 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 |
| Amino acids are acids because they always possess which functional group? | carboxyl |
| 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 |
| enantiomers | -must have 4 different elements -must be a mirror image -letter arrangement doenst matter |
| Which two functional groups are always found in amino acids? | carboxyl and amino |
| What is the pH of a solution with a proton, [H+], concentration of 10-8 M? Answer | pH 8 |
| 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 |
| 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. |
| 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 |
| At what temperature is water at its densest? | 4 degrees c |
| What gives rise to the cohesiveness of water molecules? | hydrogen bonds |
| 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 |
| 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 |
| 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 |
| 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 |
| 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. |
| 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 |
| The reactivity of an atom arises from | the existence of unpaired electrons in the valence shell. |
| A covalent bond is likely to be polar when | one of the atoms sharing electrons is much more electronegative than the other atom. |
| Prokaryotic and eukaryotic cells generally have which of the following features in common? | DNA as their genetic material |
| Which of the following is reflective of the phrase "the whole is greater than the sum of its parts"? | reductionism |
| Which branch of biology is concerned with the naming and classifying of organisms? | taxonomy |
| The lowest level of biological organization that can perform all the activities required for life is the | cell |
| 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 |
| 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 |
| 9. Which of the following results from a transfer of electron(s) between atoms? | ionic bond |
| 11. Which of the following statements concerning prokaryotic and eukaryotic cells is not correct? | Prokaryotic cells contain small membrane-enclosed organelles. |
| Prokaryotic and eukaryotic cells generally have which of the following features in common? | cellular membrane |
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