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pH and Redox
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2. Hair will dissolve completely___.
in a very strong acid only in a very strong base only in either a strong acid or a strong base even in a very weak acid in an acid or a base of ANY strength
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3. A sample of pure water contains ___.
more OH – ions than H+ ions more H+ ions than OH – ions only H2O molecules and NO ions of any kind equal numbers of OH – and H+ ions only H+ ions and NO OH – ions
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4. A pH of 1.0 or 2.0 BEST represents ___.
a strong acid a weak acid a strong base a weak base a neutral solution
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alkaline acidic neutral pH balanced a detergent
5. When a substance has had its pH adjusted to that of hair or skin it is advertised as being ___. alkaline acidic neutral pH balanced a detergent
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6. Mildly acidic solutions ___
cause the hair to dissolve are good for cleaning the hair should never be used on the hair cause the hair’s cuticle to swell make the hair’s cuticle smooth
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7. What portion of a strand of hair would have the lowest pH?
nearest to the scalp nearest to the end about in the middle between the scalp and the end This is a trick! Hair is solid and has no pH value!!
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8. In order to check the pH of a substance that substance must contain ___.
dry mixtures combustible mixtures water acid viscous mixtures
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9. On the pH scale, neutral ___.
is pH 0 is pH 7 is pH 14 different for every substance occurs when there is more H+ than OH –
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10. An acid ___. Might have a pH of 10
Could be used to neutralize pure water could be used to neutralize a base Could be used to neutralize something that was alkaline Both 3 and 4 are correct
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11. A solution becomes more basic as ___.
the OH – ion concentration decreases the OH – ion concentration increases the H+ ion concentration increases the alkalinity decreases None of the above are correct.
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12. Hair has a pH of about 14. TRUE FALSE
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13. A substance that has gained oxygen or lost hydrogen has been:
neutralized atomized oxidized reduced buffered
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14. A product that has been pH balanced to match the skin’s pH ___.
will definitely cause an allergic reaction. will definitely not cause an allergic reaction. may still cause an allergic reaction.
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15. The pH of healthy, normal skin is:
very basic very alkaline very acidic a little acidic to a little basic Both 1 and 2 are correct
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16. pH is actually an abbreviation for ___.
plenty of hydrogen plenty of hydroxide positive health potential hydroxide potential hydrogen
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17. Ammonium thioglycolate is a commonly used ___.
oxidizing agent reducing agent buffer acid None of the above
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28. The sulfur bonds of hair are very sensitive to changes in pH between 2 and 9.
TRUE FALSE
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19. A buffer is ___. someone who will get between you and a friend when you have a fight something that changes pH something that decreases pH something that resists changes in pH something that increases pH
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20. A solution with a pH of 10 is ___ times less acidic than a solution with a pH of 6.
100 1,000 10,000 100,000
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21. A solution is basic when ___.
OH – concentration is greater than H+ concentration OH – concentration is less than H+ concentration OH – concentration is equal to the H+ concentration OH – concentration is at zero OH – concentration has been neutralized
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22. A neutralization reaction is a reaction in which ___.
Combustion occurs Only oxidation occurs Only reduction occurs Water ionizes And acid and a base cancel each other out
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23. Bleaching, coloring, permanent waving and straightening all depend on ___.
the weather oxidation-reduction reactions combustion reactions the size of the dye molecules the will of the stylist
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24. When a reaction releases heat it is said to be ___.
heterogeneous homogeneous exothermic endothermic thermophilic
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25. Perborate and persulfate are both ___.
reducing agents oxidizing agents alkalizing agents double agents secret agents Sodium perborate
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26. Hair Relaxers tend to have ___ pH numbers.
acidic very small neutral very large nonexistent
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27. Hair has no buffering capacity since it is not covered by the acid mantle and is, therefore, more apt to be damaged by changes in pH. TRUE FALSE
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combustion neutralization ionization Acid Base
28. When an acid and a base are mixed the products are always salt and water. This type of reaction is called a(n)___ reaction. combustion neutralization ionization Acid Base
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29. A substance with a pH of 5 is __ times more basic than a substance with a pH of 4.
20 100 10 1,000 15
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30. ___ is the hydronium cation.
H3O+ OH+ OH – H –
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31. Which of the following represents an anion?
NH3 H+ CO32+ OH – any charged atom or molecules
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a neutralization reaction the formation of a hydrogen peroxide
32. The chemical equation shown below correctly represents ___. H2O → H+ + OH – a neutralization reaction the formation of a hydrogen peroxide a reaction in which salt and water are the products (formed) nothing the ionization of water
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33. A combustion reaction is the rapid ___ of a substance accompanied by heat and light.
neutralization ionization oxidation
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34. The pH scale is ___ which means it increases by multiples of 10
34. The pH scale is ___ which means it increases by multiples of x 10 = x 10 = 1, ,000 x 10 = 10, ,000 x 10 = 100, etc. Algebraic Geometric Mathematic Logarithmic
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34. The H+ concentration of an acid is ___ the H+ concentration of pure water
greater than less than equal to
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