Cohesion
What is the property between water molecules that helps drops hold together?
a. adhesion
b. cohesion
c. oxygen bonding
What is cohesion (or hydrogen bonding between water molecules)?
The attraction between water molecules and other materials
What is adhesion?
The two elements that make up a water molecules are:
a. Hydrogen and helium
b. Iron and oxygen
c. Hydrogen and oxygen
What are hydrogen and oxygen?
The property that allows insects to walk on water is called:
a. stretched tension
b. water tension
c. surface tension
What is c. - surface tension?
The term to describe water moving up through tiny spaces because of adhesion and cohesion is:
a. water rising movement
b. the floating principle
c. capillary action
What is c. - capillary action?
Cohesion helps water move up a plant stem by:
a. pushing the water down
b. increasing the water molecules
c. pulling water molecules upward
What is c. - pulling water molecules upward?
A simple example of adhesion is
a. ice melting
b. water spreading on glass or wetting a paper towel
c. paper airplanes
What is water spreading on glass or wetting a paper towel?
The shape of a water molecule is:
a. linear shape
b. bent shape
c. squared shape
What is bent shape?
Soap and dish detergent in water:
a. reduces surface tension
b. increases surface tension
c. makes surface tension bubble
What is a. - reduces surface tension?
Water is important for life, partly because of its solvent abilities, means:
a. it prevents chemical reactions in cells
b. it dissolves many substances so cells can use them
c. it turns solids into gases for living things
What is b. - it dissolves many substances so cells can use them?
One example that shows cohesion in water.is:
a. a fish under water
b. water beads on wax paper
c. water in a kiddy pool
What is b. - water beads on wax paper?
Adhesion helps water climb up a narrow tube by:
a. Adhesion pushes the water out and cohesion pulls it up
b. It doesn't help the water climb up
c. Adhesion to the tube walls pulls water up and cohesion pulls more water behind it
What is adhesion to the tube walls pulls water up and cohesion pulls more water behind it?
The polarity of water molecules makes salt:
a. Freeze
b. Become solid
c. Dissolve
What is dissolve?
When a drop of dish soap is added to a pepper sprinkled on water:
a. the pepper is dissolved
b. the pepper moves away
c. the pepper surrounds the soap
What is b. - the pepper moves away?
Salts and sugars dissolve in water because:
a. water molecules push solute particles together
b. water's polarity pulls solute particles apart and surrounds them
c. water loses its molecules
What is b. - water's polarity pulls solute particles apart and surrounds them?
Why is cohesion important for the formation of droplets of rain?
a. it causes the water molecules to create thunder and lightning
b. it causes water molecules to freeze and disappear
c. it causes water molecules to stick together so they form rounded droplets
What is c. - it causes water molecules to stick together so they form rounded droplets?
Adhesion's effect on water:
a. Causes water to spread
b. Causes water to bead up
c. Causes water to evaporate
What is causes water to spread?
Water is polar because:
a. hydrogen pulls electrons more than oxygen
b. oxygen pulls electron more than hydrogen
c. it freezes at 32 degrees farenheit
What is b. - oxygen pulls electron more than hydrogen?
Surface tension holds water like:
a. a paperweight
b. a skin
c. a rock
What is b. - a skin?
What happens to the bonds between water molecules when water evaporates?
a. Bonds strengthen and pull molecules closer
b. Bonds change into solid bonds
c. Bonds break so molecules separate into the air
c. Bonds break so molecules separate into the air
Water molecules stick to each other because:
a. water is a tropical molecule with a positive end and a negative end
b. water is a polar molecule that has two negative ends that repel each other
c. water is a polar molecule with a positive end and a negative end
What is c. - water is a polar molecule with a positive end and a negative end?
To test how well water sticks to different surfaces:
a. Compare water in a tube of liquid and measure the contact angle or diameter of drop spread after 10 seconds
b. Compare water on wax paper and measure the contact angle or diameter of drop spread after 10 seconds
What is b. compare water on wax paper and measure the contact angle or diameter of drop spread after 10 seconds?
The bonds between water molecules when water evaporates:
a. Bonds strengthen and pull molecules closer
b. Bonds change into solid bonds
c. Bonds break so molecules separate into the air
What is c. - Bonds break so molecules separate into the air?
Surface tension can allow:
a. a sheet of paper disappear
b. a metal paper clip rest on water
c. a rock sink to the bottom of a pond
What is b. - a metal paper clip rest on water?
Ice floats on liquid water because:
a. ice is denser than liquid water
b. ice has the same density as liquid water
c. ice is less dense than liquid water
What is c. - ice is less dense than liquid water?