CHEM 45U QUIZ 2 WATER

What is the molecular geometry of water?

• Linear

• Tetrahedral

• Bent/V-shaped

• Trigonal planar

Which of the following is a unique property of water that allows it to sustain life on Earth?

• High density of ice

• Low specific heat

• Cohesion and adhesion

• High volatility

How does water moderate temperature?

• • By absorbing heat from cooler air and releasing it to warmer air

• • By releasing heat to cooler air and absorbing it from warmer air

• • By having a low specific heat

• By freezing at high temperatures

Why does ice float on water?

• Ice has a higher density than liquid water

• Ice has a lower density than liquid water

• Ice has the same density as liquid water

• Ice is hydrophobic

What is the specific heat of water?

• 0.6 cal/g·°C

• 1.0 cal/g·°C

• 4.2 cal/g·°C

• 0.2 cal/g·°C

Which of the following weak interactions influences the structure and function of biomolecules in aqueous systems?

• Covalent bonds

• Ionic interactions

• Metallic bonds

• van der Waals forces

What is the role of water in the human body's metabolic processes?

• • It acts as an enzyme

• It serves as a solvent for metabolic reactions

• • It provides structural support to cells

• • It dehydrates molecules

What is the pH of pure water at 25°C?

• 6.0

• 7.0

• 8.0

• 9.0

Which equation is used to calculate pH in a buffer system?

• Henderson-Hasselbalch Equation

• Arrhenius Equation

• Nernst Equation

• Michaelis-Menten Equation

Which of the following is NOT a property of water?

• High surface tension

• High heat of vaporization

• Low boiling point

• Strong hydrogen bonding