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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
Hydrogen and electrons
B
Oxygen and Hydrogen
C
Oxygen and Nitrogren
D
protons and neutrons
2) The elements of a water molecule are held together by which type of bond?
A
hydrogen bond
B
double bond bond
C
ionic bond
D
covalent bond
3) Why is water called a polar molecule?
A
hydrogen donates an electron to oxygen
B
the molecule is cold
C
there is an unequal sharing of electrons in the molecule
D
oxygen donates an electron to hydrogen
4) What is water's boiling point?
A
32 degrees Fahrenheit
B
100 degrees Celsius
C
20 degrees Celsius
D
0 degrees Celsius
5) What is water's freezing point?
A
100 degrees Celsius
B
80 degrees Fahrenheit
C
0 degrees Celsius
D
20 degrees Celsius
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
Oxygen end is slightly positive, while Hydrogen end is slightly negative
B
Both Oxygen and Hydrogen have negative charges
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
the uneven sharing of electrons that creates a slightly positive and negative side.
B
the even sharing of electrons
C
has an overall positive charge
D
has an overall negative charge
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
solid
B
liquid
C
gas
11) Ice floats on liquid water. Which explanation is most correct?
A
Ice is less dense than water due to the large space between water molecules in ice crystals.
B
Ice is less dense than water due to the tightly packed 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 solvent
B
universal compound
C
universal element
D
universal solute
13) The only substance on Earth that commonly exists in all three different states is
A
salt
B
sugar
C
oil
D
water
14) When water is exposed to the sun, evaporation occurs, turning liquid water into a
A
solid
B
liquid
C
gas
15) At which temperatures could water potentially be found in a LIQUID state?
A
22° C
B
-15° C
C
112° C
D
125° C
*select an answer for all questions
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