#1
What is the chemical formula of water?
H2O
ExplanationMolecule composed of two hydrogen atoms and one oxygen atom.
#2
Which of the following best describes water's boiling point?
100°C
ExplanationTemperature at which water transitions from liquid to gas phase.
#3
What is the term for the process by which water vapor turns into liquid water?
Condensation
ExplanationConversion of water vapor into liquid water.
#4
What is the term for the process of converting liquid water into water vapor?
Evaporation
ExplanationTransformation of liquid water into vapor due to heat.
#5
What property of water allows it to form droplets?
Surface tension
ExplanationForce that causes water molecules to be attracted to each other.
#6
Which statement about water's density is true?
Water is most dense as a liquid
ExplanationDensity of water is highest in liquid form compared to solid or gas.
#7
What is the term for the maximum amount of water vapor that the air can hold at a given temperature?
Absolute humidity
ExplanationMaximum moisture content air can hold before precipitation occurs.
#8
Which of the following is NOT a property of water?
Low surface tension
ExplanationWater's surface tension is relatively high.
#9
What is the term for the ability of water to stick to other substances?
Adhesion
ExplanationAttraction between water molecules and other substances.
#10
Which of the following is NOT a unique property of water?
Viscosity
ExplanationWater's viscosity is a unique property.
#11
What is the process by which plants release water vapor?
Transpiration
ExplanationRelease of water vapor from plant surfaces.
#12
What causes water to have a higher boiling point compared to similar compounds?
Hydrogen bonding
ExplanationIntermolecular forces between water molecules.
#13
Which property of water allows it to moderate Earth's temperature?
High heat capacity
ExplanationAbility to absorb and retain heat.
#14
What is the term for the phenomenon where water molecules arrange in a hexagonal lattice as they freeze?
Hydrogen bonding
ExplanationArrangement of water molecules due to hydrogen bonds during freezing.
#15
Which of the following statements about water's structure is true?
Water has a tetrahedral molecular structure
ExplanationArrangement of hydrogen atoms around an oxygen atom in a tetrahedral shape.