Unique Water
Water has a high specific heat capacity. This means that it takes a long time to for water to heat up but also a long time to ___ once it's heated.
cool
The components of a molecule of water.
2 hydrogen atoms and 1 oxygen atom
A water molecule looks sort of like
Mickey Mouse
True/False: Water is the only natural substance that can exist in all 3 states of matter at normal temperatures for Earth.
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?
A. The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
B 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.
C. The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
D. The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
Answer: A The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
Where will we find that we have warmer winters and cooler summers due to water's high specific heat capacity?
Near the coast
The hydrogen end of water has a
slight positive charge
True
Water sticking to other surfaces/substances is known as
Adhesion
Why does ice float?
A. As water freezes, it expands and its density decreases.
B. As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
C. As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
D. As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
Answer : A. As water freezes, it expands and its density decreases.
What property of water explains why our ocean has such a high level of carbon in it?
Universal Solvent
The oxygen end of a water molecule has a
slight negative charge
Water is sticking to other water molecules is known as?
Cohesion
The melting point of water is equal to its
freezing point
The reason the water balloon did NOT pop while held over a flame is water's
A. Less dense than air.
B. polarity.
C. Hydrogen bonds between water molecules.
D. high specific heat capacity.
Answer: D. high specific heat capacity.
Which types of compounds dissolve easily in water?
A. Polar and Nonpolar
B. Polar and Ionic
C. Nonpolar and Ionic
D. Covalent and Nonpolar
B. Polar and Ionic
Why are water molecules attracted to each other?
because of polar bonding
This causes water to clump together in drops.
cohesion
Ice floats because
solid water (ice) is less dense than liquid water
Water has a much higher specific heat than most other covalent compounds. What do you predict might happen if water had a low specific heat instead?
A. Flooding would occur and animals would be forced to migrate.
B. Harmful organisms living in water would reproduce at a rapid rate.
C. Organisms that are sensitive to changes in temperature would die.
D. Plants would not have enough water to effectively carry out photosynthesis.
C. Organisms that are sensitive to changes in temperature would die.
Capillary action is made possible due to which two properties of water?
Cohesion and adhesion
What type of bond is formed from the attraction between the positive end of one water molecule and the negative end of another water molecule?
a hydrogen bond
This causes water to stick to other polar substances besides other water molecules.
adhesion
How do bodies of water freeze?
from the top down
Water is often called the "universal solvent" because many substances can be dissolved in water. What property of water allows it to be such a versatile solvent?
A. purity
B. polarity and cohesion
C. high heat capacity
D. expansion upon freezing
B. polarity and cohesion