Water in Food Chemistry Quiz

What is the chemical formula of water?

• O2H

• HO2

• H2O

• H2O2

Which of the following is NOT a function of water in food?

• Lubricant

• Preservative

• Carrier of nutrients

• Solvent

What type of bond holds hydrogen and oxygen atoms together in water?

• Ionic bond

• Hydrogen bond

• Metallic bond

• Covalent bond

What is water activity (Aw)?

• The freezing point of water

• The ratio of vapor pressure of water in a solution to pure water

• The amount of water in food

• The temperature at which water boils

Which type of water is described as being immobilized in capillaries or cells?

• Liquid water

• Entrapped water

• Bound water

• Free water

At what water activity level does bacterial growth start?

• 0.2

• 0.5

• 0.8

• 1.0

What is the typical water activity of fruits and vegetables?

• 0.95

• 0.65

• 0.87

• 0.30

Which drying method is widely used for moisture determination?

• Infrared spectroscopy

• Forced draft oven

• Microwave oven

• Vacuum oven

What happens to the Maillard reaction at high moisture levels?

• It becomes more complex

• It accelerates

• It slows down

• It stops completely

Which of the following is a type of bound water?

• Liquid water

• Water in plant cells

• Ice

• Water vapor