For each statement below, indicate whether it is True orFalse.
1. Breaking the hydrogen bond between two water molecules is calleddissociation. True False
2. When water dissociates, an oxygen atom separates from the restof the molecule. True False
3. The hydroxide ion has an overall charge of-1. True False
4. A hydrogen ion is the same as a proton.True False
5. When a hydrogen ion separates from a water molecule, it usuallycombines with another water molecule to form a hydronium ion.True False
6. A hydronium ion has the formula H2O+.True False
7. In pure water, at 25OC, about 10% of the watermolecules are dissociated at any given time.True False
8. In pure water, the concentration of hydrogen ions always equalsthe concentration of hydroxide ions.True False
9. In pure water, the concentration of hydrogen ions is 1 x107 molar. True False
10. Water dissociates into oppositely charged ions.True False
For each statement below, indicate whether it is True orFalse.
1. Breaking the hydrogen bond between two water molecules is calleddissociation. True False
2. When water dissociates, an oxygen atom separates from the restof the molecule. True False
3. The hydroxide ion has an overall charge of-1. True False
4. A hydrogen ion is the same as a proton.True False
5. When a hydrogen ion separates from a water molecule, it usuallycombines with another water molecule to form a hydronium ion.True False
6. A hydronium ion has the formula H2O+.True False
7. In pure water, at 25OC, about 10% of the watermolecules are dissociated at any given time.True False
8. In pure water, the concentration of hydrogen ions always equalsthe concentration of hydroxide ions.True False
9. In pure water, the concentration of hydrogen ions is 1 x107 molar. True False
10. Water dissociates into oppositely charged ions.True False
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Related questions
Part A
Which answer is a true statement about pH values?
Part A
Which answer is a true statement about pH values?
Which answer is a true statement about pH values?
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Part B
What conditions must be met in order for an aqueous solution to be called âneutralâ?
What conditions must be met in order for an aqueous solution to be called âneutralâ?
| Pure water has a pH of 0. |
| pH is important in life mainly because it affects the cohesion of water. |
| A high pH corresponds to a high H+ concentration. |
| Stomach juice has a high pH. |
| None of the above. |
SubmitHintsMy AnswersGive UpReview Part
Part C
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
| The hydronium ion concentration is greater than the hydroxide ion concentration. |
| The concentrations of hydronium and hydroxide ions are equal. |
| There are no hydronium or hydroxide ions present in the solution. |
| The hydroxide ion concentration is greater than the hydronium ion concentration. |
| None of the above. |
SubmitHintsMy AnswersGive UpReview Part
Incorrect; One attempt remaining; Try Again
No, there's a power-of-ten relationship between the pH and the concentration. Maybe you should review the lesson.
Part D
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
| log (5) M |
| 105 M |
| 10-5 M |
| 5% |
| 5.0 M |
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Part E
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
| Cut it in half. |
| Double it. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| Raise it to 200 times its present value. |
SubmitHintsMy AnswersGive UpReview Part
Part F
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
| Reduce it to 1/200 times its present value. |
| Double it. |
| Cut it in half. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| 10-5 M |
| 10-9 M |
| 10-1 M |
| 5 M |
| Can't tell without more information. |
Part B
What conditions must be met in order for an aqueous solution to be called âneutralâ?
| Pure water has a pH of 0. |
| pH is important in life mainly because it affects the cohesion of water. |
| A high pH corresponds to a high H+ concentration. |
| Stomach juice has a high pH. |
| None of the above. |
Part C
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
| The hydronium ion concentration is greater than the hydroxide ion concentration. |
| The concentrations of hydronium and hydroxide ions are equal. |
| There are no hydronium or hydroxide ions present in the solution. |
| The hydroxide ion concentration is greater than the hydronium ion concentration. |
| None of the above. |
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
| log (5) M |
| 105 M |
| 10-5 M |
| 5% |
| 5.0 M |
Part E
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
| Cut it in half. |
| Double it. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| Raise it to 200 times its present value. |
SubmitHintsMy AnswersGive UpReview Part
Part F
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
| Reduce it to 1/200 times its present value. |
| Double it. |
| Cut it in half. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| 10-5 M |
| 10-9 M |
| 10-1 M |
| 5 M |
| Can't tell without more information. |
I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and be correct and clear it is important ok
Question 5
At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......
| less fluid |
| more fluid |
| fluidity will be unchanged |
Question 6
Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane
| high proportions of saturated phospholipids |
| high proportions of unsaturated phospholipids |
| an equal ratio of saturated to unsaturated phospholipid |
Question 7
Membrane proteins have an important role in membrane fluidity
| True |
| False |
Question 8
The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?
| europeans because their ancestors survived the bubonic plague |
| North Americans because their ancestors survived small pox |
| europeans because they have a longer evolutionary past with HIV |
| Africans because they have a longer evolutionary past with HIV |
Question 9
Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax
Question 10
Diffusion requires energy
| True |
| False |
Question 11
The net direction of molecule movement when molecules diffuse is
| down their concentration gradient |
| random directions |
Question 12
In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?
| True |
| False |
Question 13
Which best defines osmosis?
| In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration? |
| In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration? |
Question 14
Animal cells placed into a hypotonic solution would most likely?
| lyse (burst) |
| shrink |
| remain unchanged in size |
Question 15
Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids
| True |
| False |
Question 16
ATP powered pumps move substances into and out of cells by diffusion?
| True |
| False |
Question 17
For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.
| True |
| False |
Question 18
Bulk transport of fluid and any of the substances within that fluid is called
| pinocytosis |
| phagocytosis |
| receptor-mediated endocytosis |
| exocytosis |
I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and on Questions 6 and 9 please help me with it hope you can help me with the correct answers please
Question 5
At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......
| less fluid |
| more fluid |
| fluidity will be unchanged |
Question 6
Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane
| high proportions of saturated phospholipids |
| high proportions of unsaturated phospholipids |
| an equal ratio of saturated to unsaturated phospholipid |
Question 7
Membrane proteins have an important role in membrane fluidity
| True |
| False |
Question 8
The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?
| europeans because their ancestors survived the bubonic plague |
| North Americans because their ancestors survived small pox |
| europeans because they have a longer evolutionary past with HIV |
| Africans because they have a longer evolutionary past with HIV |
Question 9
Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax
Question 10
Diffusion requires energy
| True |
| False |
Question 11
The net direction of molecule movement when molecules diffuse is
| down their concentration gradient |
| random directions |
Question 12
In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?
| True |
| False |
Question 13
Which best defines osmosis?
| In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration? |
| In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration? |
Question 14
Animal cells placed into a hypotonic solution would most likely?
| lyse (burst) |
| shrink |
| remain unchanged in size |
Question 15
Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids
| True |
| False |
Question 16
ATP powered pumps move substances into and out of cells by diffusion?
| True |
| False |
Question 17
For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.
| True |
| False |
Question 18
Bulk transport of fluid and any of the substances within that fluid is called
| pinocytosis |
| phagocytosis |
| receptor-mediated endocytosis |
| exocytosis |