test review for ph and redox
DESCRIPTION
Test Review for pH and Redox. Teacher Copy. 1. TRUE or FALSE. The pH of hair relaxers is basic (alkaline). 1. TRUE. Hair relaxers usually have a pH between 11-13. 2. SHORT ANSWER. What happens to hair when the pH is above 13 or below 1?. 2. It dissolves. - PowerPoint PPT PresentationTRANSCRIPT
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Test Review for
pH and Redox
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Teacher Copy
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1. TRUE or FALSE
The pH of hair relaxers is basic (alkaline)
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1. TRUE
• Hair relaxers usually have a pH between 11-13
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2. SHORT ANSWER
• What happens to hair when the pH is above 13 or
below 1?
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2. It dissolves
• Hair dissolves completely when the pH is VERY high or VERY low
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3. MULTIPLE CHOICE• Which of the following is the most
likely pH for the ends of long hair?
A. 16
B. 14
C. 6.5
D. 5
E. 1
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3. C
• Hair becomes more alkaline the further it is away from the scalp. The ends of hair may have a pH 1 to 2 pH points higher than that of hair right next to the scalp.
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4. MULTIPLE CHOICE
• Which of the following substances is an oxidizing agent?
• A. H2O2
• B. perborate• C. ammonia• D. Ammonium thioglycolate• E. Both A. and B. are correct
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4. A.
Other oxidizing agents are:• H2O2
• Ammonia and ammonium thioglycolate are reducing agents
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5. SHORT ANSWER
• How would you describe a combustion reaction?
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5. A rapid oxidation that releases energy in the form of heat and light
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6. SHORT ANSWER
• A pH of 8.0 is ___ times more basic than a pH of 6.0
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6. 100
• pH changes by a factor of 10 between each number on the pH scale
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7. TRUE or FALSE
• A solution with a pH of 9.0 can be more acidic than a solution with a pH 7.0
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7. FALSE
• A pH number can only be more BASIC than any number smaller than itself
• Conversely, a pH number can only be more ACIDIC than any number larger than itself
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8. SHORT ANSWER
• What is a good pH range for skin care products?
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8. pH 4 - pH 8
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9. SHORT ANSWER
• An ion with a negative charge is called a(n) ___.
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9. anion
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10. MULTIPLE CHOICE• Which pH number would contain
the most hydroxide ions?A. 7B. 7.5C. 10D. 3E. 1
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10. C
• As the pH number ↑, the number of OH – ions also ↑
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11. TRUE or FALSE
• In an aqueous solution, as the H+ concentration ↑ the OH – ↓
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11. TRUE
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12. TRUE or FALSE
• As the pH number ↑ the solution becomes more acidic.
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12. FALSE
• As pH number increases the solution becomes more basic (alkaline)
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13. TRUE or FALSE
• The products of a neutralization reaction (when an acid and a base react) are always salt and water.
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13. TRUE
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14. TRUE or FALSE
• pH is a physical property
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14. True
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15. SHORT ANSWER
• When heat is released during a process, that process is said to be ___.
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15. exothermic
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16. SHORT ANSWER
• Why are most skin and hair care products pH balanced?
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16. To be more compatible with the pH of skin and hair
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17. TRUE or FALSE
• pH balanced skin and hair care products cannot hurt the skin and hair
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17. FALSE
• pH balancing does not automatically make the product better for the skin and hair; pH blanced products may still contain allergens or irritants
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18. TRUE or FALSE
• In pure water the hydrogen (hydronium) ion concen-tration is equal to the hydroxide ion concentration.
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18. TRUE
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19. SHORT ANSWER
• Would an aqueous solution that causes the cuticle scales to lie down and become smooth be more likely to be acidic or basic?
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19. acidic
• Mildly acidic solutions cause the hair to ‘harden’ (cuticle scales to lie down)
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20. MULTIPLE CHOICE
The hydrogen ion concentration of a strong acid is ___ than that of pure water.
A.Equal to
B.More than
C.Less than
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20. B
• The stronger the acid the more H+ the acid has compared to that of water
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21. SHORT ANSWER
• Name two salon services that depend on oxidation-reduction reactions.
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21.
Bleachingpermanent waving
tintingrelaxing
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22. MULTIPLE CHOICE
• When water ionizes, it splits into ___.
• A. 2 hydroxide ions
• B. 2 hydrogen (hydronium) ions
• C. 2 hydroxide and 2 hydronium ions
• D. 1 hydroxide and 1 hydronium ion
• E. 2 hydronium and 1 hydroxide ion
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22. D
• H2O → H+ + OH –
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23. SHORT ANSWER
• When a substance is oxidized, what 2 things may happen?
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23.
The substance may:
gain oxygenor
lose hydrogen
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24. SHORT ANSWER
• A substance that releases oxygen is a(n) ___.
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24. Oxidizing agent