PBL Water and pH

What helps a solution resist pH change?

• Buffer
• Water
• Hydrogen

What is the name of the force per unit area exerted by an atmospheric colum?

• Force
• Gas pressure
• Barometric pressure

The force exerted by a gas per unit survace area of an object is called gas pressure.

• Barometric pressure
• Gas pressure
• Force

A homogeneous mixture composed of only one phase.

• Solution
• Colloid

What tool is used to measure vapor pressure?

• Manometer
• Thermometer
• Balance

The temperature at which the vapor pressure of the liquid is just equal to the external pressure on the liquid is the ____________?

• Boiling point
• Freezing point

What tool do we use to measure mass?

• Thermometer
• Balance
• Graduated cylinder

What is the SI unit for time? 

• Seconds
• Hours
• Minutes

A certain temperature must be reached in which the motion of particles completely stop.

• Freezing
• Melting
• Absolute zero

Gas to Solid

• Freezing
• Melting 
• Sublimination 
• Deposition