pH and Redox

2. Hair will dissolve completely___.1. in a very strong acid only2. in a very strong base only3. in either a strong acid or a strong base4. even in a very weak acid5. in an acid or a base of ANY strength

3. A sample of pure water contains ___.

1. more OH – ions than H+ ions2. more H+ ions than OH – ions3. only H2O molecules and NO ions of any

kind4. equal numbers of OH – and H+ ions5. only H+ ions and NO OH – ions

4. A pH of 1.0 or 2.0 BEST represents ___.

1. a strong acid2. a weak acid3. a strong base4. a weak base5. a neutral solution

5. When a substance has had its pH adjusted to that of hair or skin it is advertised as being ___.

1. alkaline2. acidic3. neutral4. pH balanced5. a detergent

6. Mildly acidic solutions ___1. cause the hair to dissolve2. are good for cleaning the hair3. should never be used on the hair4. cause the hair’s cuticle to swell5. make the hair’s cuticle smooth

7. What portion of a strand of hair would have the lowest pH?

1. nearest to the scalp2. nearest to the end3. about in the middle between

the scalp and the end4. This is a trick! Hair is solid

and has no pH value!!

8. In order to check the pH of a substance that substance must contain ___.

1. dry mixtures2. combustible mixtures3. water4. acid5. viscous mixtures

9. On the pH scale, neutral ___.

1. is pH 02. is pH 73. is pH 144. different for every substance5. occurs when there is more H+ than OH –

10. An acid ___. 1. Might have a pH of 102. Could be used to

neutralize pure water3. could be used to

neutralize a base4. Could be used to

neutralize something that was alkaline

5. Both 3 and 4 are correct

11. A solution becomes more basic as ___.

1. the OH – ion concentration decreases2. the OH – ion concentration increases3. the H+ ion concentration increases4. the alkalinity decreases5. None of the above are correct.

12. Hair has a pH of about 14.

1. TRUE2. FALSE

13. A substance that has gained oxygen or lost hydrogen has been:

1. neutralized2. atomized3. oxidized4. reduced5. buffered

14. A product that has been pH balanced to match the skin’s pH ___.

1. will definitely cause an allergic reaction.2. will definitely not cause an allergic reaction.3. may still cause an allergic reaction.

15. The pH of healthy, normal skin is:1. very basic2. very alkaline3. very acidic4. a little acidic to a little basic5. Both 1 and 2 are correct

16. pH is actually an abbreviation for ___.

1. plenty of hydrogen2. plenty of hydroxide3. positive health4. potential hydroxide5. potential hydrogen

17. Ammonium thioglycolate is a commonly used ___.

1. oxidizing agent2. reducing agent3. buffer4. acid5. None of the above

28. The sulfur bonds of hair are very sensitive to changes in pH between 2 and 9.

1. TRUE2. FALSE

19. A buffer is ___.

1. someone who will get between you and a friend when you have a fight

2. something that changes pH

3. something that decreases pH

4. something that resists changes in pH

5. something that increases pH

20. A solution with a pH of 10 is ___ times less acidic than a solution with a pH of 6.

1. 102. 1003. 1,0004. 10,0005. 100,000

21. A solution is basic when ___.

1. OH – concentration is greater than H+ concentration2. OH – concentration is less than H+ concentration3. OH – concentration is equal to the H+ concentration4. OH – concentration is at zero5. OH – concentration has been neutralized

22. A neutralization reaction is a reaction in which ___.

1. Combustion occurs2. Only oxidation occurs3. Only reduction occurs4. Water ionizes5. And acid and a base cancel each other out

23. Bleaching, coloring, permanent waving and straightening all depend on ___.

1. the weather2. oxidation-reduction reactions3. combustion reactions4. the size of the dye molecules5. the will of the stylist

24. When a reaction releases heat it is said to be ___.

1. heterogeneous2. homogeneous3. exothermic4. endothermic5. thermophilic

25. Perborate and persulfate are both ___.

Sodium perborate

1. reducing agents2. oxidizing agents3. alkalizing agents4. double agents5. secret agents

26. Hair Relaxers tend to have ___ pH numbers.

1. acidic2. very small3. neutral4. very large5. nonexistent

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.

1. TRUE2. FALSE

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.

1. combustion2. neutralization3. ionization4. Acid5. Base

29. A substance with a pH of 5 is __ times more basic than a substance with a pH of 4.

1. 202. 1003. 104. 1,0005. 15

30. ___ is the hydronium cation.1. O+

2. H3O+

3. OH+

4. OH – 5. H –

31. Which of the following represents an anion?1. NH3

2. H+

3. CO32+

4. OH – 5. any charged atom or molecules

32. The chemical equation shown below correctly represents ___.

H2O → H+ + OH –

1. a neutralization reaction2. the formation of a hydrogen peroxide3. a reaction in which salt and water are the

products (formed)4. nothing5. the ionization of water

33. A combustion reaction is the rapid ___ of a substance accompanied by heat and light.

1. neutralization2. ionization3. oxidation

34. The pH scale is ___ which means it increases by multiples of 10.

10 x 10 = 100 100 x 10 = 1,000 1,000 x 10 = 10,000 10,000 x 10 = 100,000 etc.

1. Algebraic2. Geometric3. Mathematic4. Logarithmic

34. The H+ concentration of an acid is ___ the H+ concentration of pure water

1. greater than2. less than 3. equal to