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Rosa Parks was a nice woman that was black and was in the CIVIL WAR MOMENTS she got on the bus and she was so teirdso she sit in the front but white people were sitting there black people had to go to the
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What type of bonds are formed in hair?
Disulphide bonds. A covalent bond between two sulfur atoms.
Why don't hair perms wash out when you wash your hair in terms of ionic and covalent bonds?
The permanents are ionically bonded to the hair because the ionically bond is stronger. Which allows the permanents to stay permanent.
What effect does neutralizer have on the hair structure?
When neutralizer is applied to hair, it breaks down the hair's cysteine and sulphur bonds. This allows curls to form and stay for a while.
When hair is reset what type of bonds are formed?
S-SDisulphide bonds.
What type of chemical constitutes hair?
The hair as with everything begins with atoms, these build up to create amino acids which the hair contains 18 of the 21 amino acids, those build up to create polypeptide chains which produce peptide bonds or side bonds (there are 3, hydrogen, salt, disulfide) this create the Cortical layer which leafs to the cuticle
What type of bonds are formed in hair?
Disulphide bonds. A covalent bond between two sulfur atoms.
What does humidity do to the hair structure?
The cells in hair are held together by covalent bonds and covalent bonds are affected by water.
Why don't hair perms wash out when you wash your hair in terms of ionic and covalent bonds?
The permanents are ionically bonded to the hair because the ionically bond is stronger. Which allows the permanents to stay permanent.
What is lanthionization?
Lanthionization is the process by which hydroxide relaxers permanently straighten hair. It breaks the hair's disulfide bonds during processing and converts them to lanthionine bonds when the relaxer is rinsed from the hair. Disulfide bonds contain two sulfur atoms. Lanthionine bonds contain only sulfur atom. The disulfide bonds that are broken by hydroxide relaxers are broken permanently and can never be re-formed.
What effect does neutralizer have on the hair structure?
When neutralizer is applied to hair, it breaks down the hair's cysteine and sulphur bonds. This allows curls to form and stay for a while.
When hair is permed what types of bonds are broken?
Polypeptide bonds
When hair is reset what type of bonds are formed?
S-SDisulphide bonds.
What type of chemical constitutes hair?
The hair as with everything begins with atoms, these build up to create amino acids which the hair contains 18 of the 21 amino acids, those build up to create polypeptide chains which produce peptide bonds or side bonds (there are 3, hydrogen, salt, disulfide) this create the Cortical layer which leafs to the cuticle
Why hairs can be straightened or curled with heat or chemical treatment?
When heat or chemicals are applied to the proteins in hair, the disulfide bonds of cysteine units are broken in the polypeptide structures of the hair proteins. The protein can then be straightened or curled, and then the disulfide bonds form again, locking the protein in that conformation.
How does a perm work?
It has to do with the hair strands natural disulfide bonds being reduced and then re-oxidized after you have set hair in the desired curlers so that when the sulfide bonds reform they are in the shape that you want them to be.
What are the three types of chemical bonds that cross-link protein strands in your hair?
Salt bonds, hydrogen bonds, disulfide bonds
Why does hair curl?
Hair is curly or straight, depending upon the number of disulfide bonds between hair proteins found in the hair shaft. The greater the number of links, the curlier the hair, and the fewer the number of links, the straighter the hair. Hair is primarily composed of keratin, a protein, which grows from a sac called the follicle. Cells in the hair follicle generate keratin, and various other proteins, which become a part of the hair shaft. These proteins contain sulfur atoms, and when two of these sulfur atoms pair up and bond, they form a disulfide bond. If the two sulfur atoms in the same protein are at a distance, and join to form the disulfide bond, the protein will bend. The amount of humidity in the air not only makes for what some label a "bad hair day," but alters the degree of curliness or of straightness of hair. This occurs when high humidity forces water back into the hair fiber, acts on its protein structure, and forces the hair shaft to return to its original structure. People can temporarily alter their hair to force it into a straight state, or a curly state, but only on a temporary, not on a permanent, basis. When a straight-haired person gets a "permanent wave," known as a "perm," he or she is chemically forcing the making of strong disulfide bonds. The wave does not stay permanently, because new hair, which is straight, grows in as the "perm" grows out. People with curly hair may chemically alter their hair to give it a straighter appearance, but this, too, is also a temporary solution to a permanent "problem," with the same end result.
