What substance is added to aftershave lotions to provide a cooling effect?
A) diethyl ether
B) menthol
C) 2-propanol
D) propane
Correct Answer:
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Q86: In toothpaste,the most important function of the
Q87: The principal material of tooth enamel is
A)fluoride.
B)collagen.
C)hydroxyapatite.
D)protein.
Q88: Perfumes are
A)pure substances.
B)compounds.
C)simple mixtures of compounds.
D)complex mixtures
Q89: The fraction of compounds in a perfume
Q90: The following is a list of ingredients
Q92: The fraction of compounds in a perfume
Q93: Identify the compound that is NOT used
Q94: A perfume's fragrance is just a bit
Q95: Colognes are about _% as strong as
Q96: The layer of skin whose moisture content
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