Because water is able to dissolve most things, it is known as the
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1
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Question 28
28.
In a water molecule, the angle between the hydrogen atoms is how many degrees?
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29.
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30.
What does turbidity of water measure?
the salinity of water
the clarity of water
In a water molecule, the oxygen atom is
positively charged
Negatively charged
What is cohesion?
Ability for water molecules to "stick" to other water molecules
Molecules in liquid water are closer together than they are in solid water
The primary contributor to the salinity of saltwater is
NaCl
NaOH
What is adhesion?
Ability for water molecules to "stick" to other water molecules
Ability for water molecules to "stick" to other types of molecules
What percentage of freshwater is readily available for consumption?
3%
0.3%
What percentage of all the water on Earth is freshwater?
97%
3%
Why does ice (solid water) float in liquid water?
Solid water is more dense than liquid water
Solid water is less dense than liquid water
Which of the following scenarios is an example of cohesion
water molecules stick to the surface of a mirror
water molecules stick to one another and form a bead
The specific heat capacity of water is
high
low
Saltwater freezes at
the same temperature as freshwater
colder temperature than freshwater
Certain insects can "walk on water" due to the _______ of water, created by ______.
adhesion; specific heat
surface tension; cohesion
How many hydrogen atoms does each water molecule have?
2
3
What property allows water to stick to glass ?
Adhesion
Cohesion
Which of the following is more electronegative (has more of the negative charge) in a water molecule?
Oxygen
Hydrogen
Numbers higher than a 7.1 on the pH scale are a(n)
acidic
basic/alkaline
The pH of pure water is
14
7
Maria, after finding no cold sodas in the refrigerator, placed a can of soda in the freezer. She then proceeded to check her social networking site and forgot about the soda. Later that evening her brother went to get some ice and it was brown. Maria’s soda can had split open. What is the best explanation for what happened?
As the water cooled, it adhered to the can, causing it to split
When the water froze, the space between the water molecules expanded making it less dense
Water molecules are polar.
This means...
oxygen side is a little negative and the hydrogen side is a little positive.
oxygen and hydrogen sides are both a little positive.
Which is the strongest base?
Hydrochloric acid
Sodium hydroxide
What is the charge on the hydrogen end of the molecule shown in the picture?
slightly positive (+)
slightly negative (-)
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25.
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26.
Question 27
27.
Brackish water has a higher salinity than saltwater.
True
False
Which of the following is true about the pH levels of acids and bases?
Acids have pH greater than 7, bases have pH less than 7
Acids have pH less than 7, bases have pH greater than 7
According to the picture, how cold is the air temperature?
0 C
4 C
According to the picture, how cold is the water temperature?
0 C
4 C
Where is it warmer in the picture?
it's warmer in the air
it's warmer in the water
How does the layer of ice at the surface affect the water and the fish below the surface?
The layer of ice insulates the fish and the water keeping them colder.
The layer of ice insulates the fish and the water keeping them warmer.
