Properties of Water

What is cohesion?

• Attraction between different substances

• Attraction between similar molecules

• The ability of a liquid to flow

What is adhesion?

• Attraction between different substances

• Attraction between similar molecules

• The ability of a liquid to evaporate

What property of water allows it to form "dome" like properties

(a)  

Which of the following best describes the effect of surface tension?

• It creates a "skin" on the surface of water

• It allows large objects to sink easily

• It prevents small insects from walking on water

What happens to water molecules at the surface of a pond?

• Nothing, they sit in place getting ready to crash in

• They are attracted to the molecules in the air above them

• They are attracted to the water molecules beneath them

What is the main reason a paperclip can float on water despite being made of metal?

(a)  

Which of the following demonstrates adhesion?

• Water forming a droplet

• Water climbing up a paper towel

• Water freezing into ice

Why do some insects, like water striders, walk on water?

• They push the water down

• They are very light

• Cohesion and surface tension create a supportive layer

Cohesion of water molecules increases or decreases surface tension

(a)  

What would happen if surface tension did not exist?

• Small objects would easily sink

• Water would evaporate slower

• Water would freeze faster