Quiz #3: Bonds, Water & pH

1. What type of bond involves sharing electrons?

• Ionic

• Covalent

• Hydrogen

• van der Waals

3. What causes a covalent bond to be polar?

• Difference in electronegativity

• Shared protons

• Opposite charges

• Equal electron sharing
  

4. What is formed when a metal reacts with a nonmetal?

• Ionic bond

• van der Waals interaction

• Hydrogen bond

• Nonpolar covalent

2. What gives water the ability to moderate temperature?

• Cohesion

• Adhesion

• Polarity

• Hydrogen bonding

5. Surface tension is a property of which molecule?

• Carbon dioxide

• Sodium chloride

• Glucose

• Water

6. Why does ice float on liquid water?

• Hydrogen bonds decrease density

• Cohesion decreases density

• Thermal expansion increases density

• Adhesion increases density

8. What is the pH of pure water at 25°C?

• 1

• 7

• 10

• 14

9. What effect does an acid have on pH?

• Raises it

• Lowers it

• No effect

• Makes it neutral

10. Bases are defined as substances that _____.

• Add protons

• Add electrons

• Remove protons

• Remove electrons

7. What property allows water to flow through plant stems and roots?

• Adhesion

• Cohesion

• Polarity

• pH