In each blank, try to type in the
word that is missing. If you've
typed in the correct word, the
blank will turn green.
If your not sure what answer should be entered, press the space bar and the next missing letter will be displayed. When you are all done, you should look back over all your answers and review the ones in red. These ones in red are the ones which you needed help on. Question: Measurements show that the pH of a particular lake is 4.0. What is the ion concentration of the lake?Answer: 10^-4, the solution is always equal to the negative exponent of the pH Question: that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxide ion concentration of this lake?Answer: 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 would be 10^-10 Question: As the pH lowers on the Answer: the levels (H+) go down.
the Hydroxide levels (OH-) go up.
Question: As the pH on the scaleAnswer: the levels (H+) go up.
the Hydroxide levels (OH-) go down. Question: Which of the following statements is true buffer solutions?
Answer
Answer: They a relatively constant pH when either acids or bases are added to them. Question: Buffer Answer: are used as a of keeping pH at a nearly constant value in regards to acids and bases Question: Which of the following solutions has the concentration of protons, [H+]?
Answer: gastric juice at pH 2 (this is simple because the the pH the higher the acid level) Question: What is the pH of a solution with a hydroxide ion, [OH-], of 10-12 M?
Answer: this is another one of "must be 14" questions. ph 2 = 10^-2.
2=12=14 Question: Amino acids are acids because they possess which functional group?Answer: carboxyl Question: One of the 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?Answer: Stanley Question: Answer: -must have 4 elements
-must be a mirror image
-letter arrangement doenst matter Question: Which two functional groups are always found in amino ?Answer: and amino Question: What is the pH of a with a proton, [H+], concentration of 10-8 M?
Answer
Answer: pH Question: of the following solutions has the greatest concentration of hydroxide ions, [OH-]?Answer: the hydoxide concentration increases the higher the pH level
pH 8 be have higher levels than pH 2 Question: Testosterone and are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other?Answer: Testosterone and have different functional groups attached to the same carbon skeleton. Question: Early 19th-century scientists believed that living organisms differed from nonliving things as a result of possessing a force" that could create organic molecules from inorganic matter. The term given to this belief isAnswer: vitalism Question: At what is water at its densest?Answer: 4 degrees Question: What gives rise to the cohesiveness of molecules?Answer: bonds Question: The slight negative charge at one end of one water molecule is attracted to the slight positive charge of water molecule. What is this attraction called?Answer: a bond Question: If the pH of a solution is increased from pH 5 to pH 7, it that the
Answer: pH of the solution should have 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
Question: Different atomic forms of an element contain the same number of protons but a different number of . What are these different atomic forms called?Answer: isotopes Question: About 25 of the 92 natural elements are known to be essential to life. four of these 25 elements make up approximately 96% of living matter?Answer: carbon, , nitrogen, oxygen Question: What is the difference between covalent bonds and bonds?Answer: bonds involve the sharing of electrons between atoms, and ionic involve the electrical attraction between atoms. Question: Trace elements are those required by an organism in only minute . Which of the following is a trace element that is required by humans and other vertebrates?Answer: iodine Question: The reactivity of an atom arises Answer: the existence of unpaired electrons in the shell. Question: A covalent bond is to be polar whenAnswer: one of the sharing electrons is much more electronegative than the other atom. Question: Prokaryotic and eukaryotic cells generally have which of the features in common?Answer: DNA as their material Question: Which of the following is of the phrase "the whole is greater than the sum of its parts"?Answer: reductionism Question: Which branch of biology is concerned with the naming and of organisms?Answer: taxonomy Question: The level of biological organization that can perform all the activities required for life is theAnswer: cell Question: 2. Nitrogen (N) is much more electronegative than hydrogen (H). of the following statements is correct about the atoms in ammonia (NH3)?Answer: Each hydrogen atom has a positive charge Question: 4. Which of the statements is false?Answer: Protons and electrons are electrically particles. Protons have one unit of negative charge, and electrons have one unit of positive charge Question: 9. Which of the following results from a transfer of electron(s) atoms?Answer: bond Question: 11. Which of the following statements concerning prokaryotic and cells is not correct?Answer: Prokaryotic contain small membrane-enclosed organelles. Question: and eukaryotic cells generally have which of the following features in common?Answer: cellular |
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