26 the letters ph denote _________________, which is the relative degree of _________________ or _________________ of a substance.
27 the ph scale measures the concentration of _________________ ions in acidic and alkaline water - based solutions.
28 a negatively charged ion is called a(n) _________________, and a positively charged ion is called a _________________.
29 a ph _________________ 7 indicates an acidic solution, a ph of _________________ is a neutral solution, and a ph _________________ 7 indicates an alkaline solution.
30 a ph of 8 is _________________ times more alkaline than a ph of 6.
31 _________________ contract and harden the hair and tighten the skin.
32 _________________ soften and swell the hair.

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Accepted Answer

### Question 26
# Brief Explanations:
pH stands for "potential of hydrogen" (or "power of hydrogen"), and it measures the relative degree of acidity or alkalinity of a substance.
# Answer:
potential of hydrogen (or power of hydrogen); acidity; alkalinity

### Question 27
# Brief Explanations:
The pH scale is based on the concentration of hydrogen ions ($\ce{H+}$) in aqueous solutions. In acidic solutions, there are more $\ce{H+}$ ions, and in alkaline (basic) solutions, there are fewer $\ce{H+}$ ions (more hydroxide ions, $\ce{OH-}$).
# Answer:
hydrogen ($\ce{H+}$)

### Question 28
# Brief Explanations:
Ions are charged particles. A negatively charged ion is called an anion (because it is attracted to the anode in electrolysis), and a positively charged ion is called a cation (attracted to the cathode).
# Answer:
anion; cation

### Question 29
# Brief Explanations:
The pH scale ranges from 0 to 14. A pH value less than 7 means the solution has a higher concentration of $\ce{H+}$ ions, so it's acidic. A pH of 7 means the concentrations of $\ce{H+}$ and $\ce{OH-}$ ions are equal, so it's neutral (like pure water). A pH greater than 7 means there are more $\ce{OH-}$ ions, so the solution is alkaline (basic).
# Answer:
less than; 7; greater than

### Question 30
# Explanation:
## Step1: Recall the pH scale relationship
The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in the concentration of $\ce{H+}$ (and thus a tenfold change in acidity/alkalinity in the opposite direction). The formula for the difference in alkalinity (or acidity) between two pH values is $10^{\Delta 	ext{pH}}$, where $\Delta 	ext{pH}$ is the difference between the two pH values.

## Step2: Calculate the difference in pH
The pH values are 8 and 6. The difference $\Delta 	ext{pH} = 8 - 6 = 2$.

## Step3: Calculate the factor of alkalinity
Using the logarithmic relationship, the factor by which a pH of 8 is more alkaline than a pH of 6 is $10^{2} = 100$. Because a higher pH (more alkaline) means a lower $\ce{H+}$ concentration, and each pH unit is a factor of 10, so two units is $10	imes10 = 100$.
# Answer:
100

### Question 31
# Brief Explanations:
Acids are substances that can donate $\ce{H+}$ ions. In cosmetology and chemistry related to hair and skin, acids have a tightening effect on hair (causing the cuticle to contract) and on the skin (making it feel tighter). Examples include citric acid, lactic acid, etc.
# Answer:
Acids

### Question 32
# Brief Explanations:
Alkalis (bases) are substances that can accept $\ce{H+}$ ions or donate $\ce{OH-}$ ions. In the context of hair, alkalis (like ammonia in some hair products) can soften the hair by breaking down disulfide bonds and cause the hair to swell, which is useful in processes like hair coloring or perming.
# Answer:
Alkalis (or Bases)

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Question 26

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