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Surface Tension (Grades 11-12)

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Surface Tension

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

The bugs called water striders stay atop water, because of                                      of water.
In the absence of external forces, the droplets of all liquids would be                         .
                   is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension.
  1. Adhesive curvature
  2. Cohesive curvature
  3. Meniscus
  4. Surface mirror
Manufacturers of glassware and other tools calibrate their measurement marks to account for the meniscus of                .
  1. bromine
  2. liquid nitrogen
  3. mercury
  4. water
What is surface tension?

Surface tension has the dimension of force per unit                .
  1. area
  2. length
  3. temperature
  4. time
What is the surface tension of water at 20 degrees C?

A                 is a substance used to reduce the surface tension of water.
  1. surfactant
  2. toner
  3. coolant
  4. effervescent
Which of these solutes will increase the surface tension of water?
  1. surfactant
  2. sugar
  3. inorganic salts
  4. alcohol
What is the equation for the thickness of a puddle of liquid on a surface whose contact angle is 180°?

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