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Water Molecule Structure
Test Description: Structure and phase changes.
Instructions: Answer all questions to get your test result.
1) Which two elements make up a water molecule?
A
protons and neutrons
B
Oxygen and Nitrogren
C
Oxygen and Hydrogen
D
Hydrogen and electrons
2) The elements of a water molecule are held together by which type of bond?
A
covalent bond
B
ionic bond
C
hydrogen bond
D
double bond bond
3) Why is water called a polar molecule?
A
hydrogen donates an electron to oxygen
B
the molecule is cold
C
oxygen donates an electron to hydrogen
D
there is an unequal sharing of electrons in the molecule
4) What is water's boiling point?
A
32 degrees Fahrenheit
B
0 degrees Celsius
C
20 degrees Celsius
D
100 degrees Celsius
5) What is water's freezing point?
A
20 degrees Celsius
B
0 degrees Celsius
C
100 degrees Celsius
D
80 degrees Fahrenheit
6) True or False: Water covers about 70% of Earth's surface.
A
false
B
true
7) Which statement best describes the structure of a water molecule?
A
Both Oxygen and Hydrogen have negative charges
B
Oxygen end is slightly positive, while Hydrogen end is slightly negative
C
Both Oxygen and Hydrogen have positive charges
D
Oxygen end is slightly negative, while Hydrogen end is slightly positive
8) Which of the following statements best describes a polar molecule?
A
has an overall negative charge
B
has an overall positive charge
C
the even sharing of electrons
D
the uneven sharing of electrons that creates a slightly positive and negative side.
9) Which state of water has molecules with the least movement?
A
liquid
B
gas
C
solid
10) Which state of water has molecules with the most movement?
A
liquid
B
gas
C
solid
11) Ice floats on liquid water. Which explanation is most correct?
A
Ice is less dense than water due to the tightly packed water molecules in ice crystals.
B
Ice is less dense than water due to the large space between water molecules in ice crystals.
C
Ice is more dense than water due to the large space between water molecules in ice crystals.
12) Water is able to dissolve many substances, and is commonly known as the
A
universal element
B
universal solute
C
universal solvent
D
universal compound
13) The only substance on Earth that commonly exists in all three different states is
A
sugar
B
salt
C
oil
D
water
14) When water is exposed to the sun, evaporation occurs, turning liquid water into a
A
liquid
B
gas
C
solid
15) At which temperatures could water potentially be found in a LIQUID state?
A
125° C
B
-15° C
C
112° C
D
22° C
*select an answer for all questions
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