Acids and Bases

What do orange juice, battery acid, soda, and milk all have in common?

• They are all acids.

• They are all used as cleaning agents.

• They all contain water.

• They are all food products.

What determines whether a solution is acidic or basic?

• The color of the solution

• The temperature of the solution

• The concentration of hydrogen ions in the solution

• The presence of oxygen in the solution

How is the acidity of a solution measured?

• Using a barometer

• On the pH scale

• With a thermometer

• By its viscosity

Who is Søren Peder Lauritz Sørensen?

• A) A Danish physicist known for his work on quantum mechanics

• B) A Danish chemist known for introducing the concept of pH

• C) A Danish biologist who discovered the structure of DNA

• D) A Danish mathematician who made significant contributions to algebra

What is a solution?

• A solid substance that dissolves in water

• A mixture of two or more substances with the same composition throughout

• A liquid that changes color when mixed with another liquid

• A gas that is visible to the naked eye

What happens to some water molecules in pure water?

• They do not interact with each other.

• They form only positively charged ions.

• They break down to form positively charged hydronium ions and negatively charged hydroxide ions.

• They break down to form only negatively charged ions.

What is the concentration of hydronium ions in a solution called?

• The neutrality

• The alkalinity

• The salinity

• The acidity

Which statement is true about water?

• Water is an acid.

• Water is a base.

• Water is neither an acid nor a base.

• Water is both an acid and a base.

Acidity is measured based on which scale?

• Temperature scale

• pH scale

• Density scale

• Volume scale

What is the pH value of water at room temperature?

• 5

• 7

• 9

• 10