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Worksheets1.1 Water
Total questions: 15
Worksheet time: 24mins
The importance of water as universal solvent is to _________________________________
(the correct answer is more than 1)
provide an aqueous medium for biochemical reaction
act as medium of transportation in living organisms
give evaporation cooling effect on leaves during transpiration
act as a very effective temperature buffer for sudden temperature changes
Water molecules are polar, with the
oxygen side being partially positive and hydrogen side being partially negative.
oxygen and hydrogen sides being partially positive.
oxygen and hydrogen sides being partially negative.
oxygen side being partially negative and hydrogen side being partially positive.
Water is a universal solvent due to its
cohesion of water molecules.
polar molecules.
high specific heat capacity.
high latent heat vaporization.
Why does ice float in liquid water?
The liquid water molecules have more kinetic energy and thus support the ice.
The ionic bonds between the molecules in ice prevent the ice from sinking.
Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.
The crystalline lattice of ice causes it to be denser than liquid water.
The unique attractive forces that keep molecules of water together are called
strong forces
adhesion
hydrogen bonds
cohesion
Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
1 hydrogen atom and 2 oxygen atoms
2 hydrogen atoms and 1 oxygen atom
2 oxygen atoms and 1 helium atom
2 helium atoms and 1 oxygen atom
Which property of water is responsible for cooling off the human body when sweat evaporates into water vapor?
Surface Tension
High latent heat of vaporization
Ice floats on water
Adhesion of water molecules
One water molecule can form hydrogen bond to a maximum of ............... water molecules.
4
3
2
1
The density of water is highest at 4ºC. What is the effect of this property of water?
Water can act as a good solvent.
Water can function as lubricant.
Water provides cooling effect on animals.
Water can function as an insulating layer.
Name the bond between two water molecules.
Covalent bond
Van der Waals interaction
Ionic bond
Hydrogen bond
Which of the following is a CORRECT pair about water molecules?
Hydrogen bond: between water molecules.
Ionic bond: between hydrogen atoms
Covalent bond: between oxygen atoms
Peptide bond: between hydrogen and oxygen atoms
Hydrogen bond is formed between
Two hydrogen atoms of a water molecule
Two hydrogen atoms of different water molecules
An oxygen atom and a hydrogen atom of different water molecules
An oxygen atom and a hydrogen atom of a same water molecules
What is the bond between oxygen atom and hydrogen atoms in a water molecule?
Hydrogen bond
Covalent bond
Peptide bond
Ionic bond
The cohesiveness of water molecules is determined by
nonpolar covalent bond
hydrophobic interaction
hydrogen bond
ionic bond
