Chemistry

Question 1

What is an acid?

Answer 1

A compound that dissolves in water to form a solution with a pH lower than 7

Examples include vinegar, lemon juice, and battery acid.

Question 2

What is the taste characteristic of acids?

Answer 2

Sour

Question 3

How do acids feel to the touch?

Answer 3

Sting

Question 4

What adjective is used to describe acids?

Answer 4

Acidic

Question 5

What is a base?

Answer 5

A compound that dissolves in water to form a solution with a pH higher than 7

Examples include toothpaste, conditioner, and ammonia.

Question 6

What is the taste characteristic of bases?

Answer 6

Bitter

Question 7

How do bases feel to the touch?

Answer 7

Slippery

Question 8

What adjective is used to describe bases?

Answer 8

Basic/Alkaline

Question 9

What does pH stand for?

Answer 9

Potential hydrogen

Question 10

What does pH measure?

Answer 10

The concentration of hydrogen ions in a solution

Question 11

What is the purpose of the pH scale?

Answer 11

To indicate how acidic or basic a substance is

Question 12

Is the pH scale logarithmic or linear?

Answer 12

Logarithmic

Question 13

What does a difference of 1 unit on the pH scale represent?

Answer 13

A 10-fold change

Question 14

What is the pH range for acidic substances?

Answer 14

Below 7

Question 15

What is the pH range for neutral substances?

Answer 15

7

Question 16

What is the pH range for basic substances?

Answer 16

Above 7

Question 17

What are indicators?

Answer 17

Substances that have a specific color change when they react with acids and bases

Indicators are used to determine the pH level of a solution.

Question 18

What is the function of pH range in indicators?

Answer 18

Each indicator has a specific pH range where it will change color

This property allows for the identification of the acidity or basicity of a solution.

Question 19

How can you approximate the pH of a solution?

Answer 19

Use two or more indicators

Combining indicators can provide a more accurate estimation of the pH level.

Question 20

What occurs during a neutralization reaction?

Answer 20

When an acid and base are mixed together

This reaction typically results in the formation of a salt and water.

Question 21

What are the products of a neutralization reaction?

Answer 21

A salt and water

For example, hydrochloric acid (HCl) and sodium hydroxide (NaOH) react to form sodium chloride (NaCl) and water (H2O).

Question 22

True or False: Indicators only change color in neutral solutions.

Answer 22

False

Indicators change color in response to different pH levels, not just in neutral solutions.