Properties of Water Assignment and Quiz
Which of these did your answer include?
Each hydrogen atom is bonded to the oxygen atom with a single bond. Oxygen is more electronegative than hydrogen. The oxygen atom has a partial negative charge, and the hydrogen atoms have a partial positive charge.
Which is a cause of polarity in water molecules?
high electronegativity difference between oxygen and hydrogen
Water molecules are polar because the
water molecule has a bent shape.
Water's boiling point would be close to Ice would ______ in water. Water would release ______ heat in the winter to warm the land. Ice is less dense than water because ______ Which statements are true based on specific heat? Check all that apply.
-70°C sink little hydrogen bonding causes ice to have a hexagonal lattice Land heats up/cools down faster than water. Regions with moderate climates often have large bodies of water surrounding them.
Water has a "bent" geometry. Which explanation does not explain why? Adhesion, cohesion, and capillary action are properties of water most closely related to ________
Electrons are evenly distributed in the water molecule. surface tension
Which of these did your answer include?
High specific heat: Hydrogen bonds increase the amount of energy required for molecules to increase in speed, thereby raising the specific heat. Lower density as a solid than as a liquid: Hydrogen bonds increase the volume of the solid by holding molecules apart, thereby decreasing the density. High surface tension: Hydrogen bonds produce strong intermolecular attractions, which increase surface tension.
Which best explains why water has a high specific heat?
Hydrogen bonds increase the amount of energy that is required for the temperature to change.
Identify four unusual properties of water that are a direct result of hydrogen bonding, and explain each in terms of hydrogen bonding.
It has a high specific heat. Ice has a lower density. Water has a high polarity.
Which statement would be true about a water molecule if it had a linear shape?
It would be a nonpolar molecule.
Describe the molecular structure of water, and explain why it is a polar molecule.
The electronegativity difference between oxygen and hydrogen is large. The bonds are highly polar. Water molecule is polar. Oxygen atoms have partial negative charge while hydrogen atoms have partial positive charge. Large electronegativity difference allows for hydrogen bonding interactions
Which statement is true about the electrons in each polar bond of a water molecule?
They are more attracted by the oxygen atom than by the hydrogen atom.
Which statement best describes how water's properties relate to its functions in a human's biological systems?
Water absorbs a lot of energy from the skin due to its high specific heat.
Which statement best explains water's ability to dissolve covalent compounds?
Water can dissolve polar covalent compounds through dipole-dipole interactions.
Water can resist a greater external force than ethanol can. Which statement best describes this difference?
Water has greater surface tension than ethanol.
:Life as we know it is impossible without water." Explain why a scientist might make this statement. Give two examples to support your answer.
Water is used for support, temperature regulation, transport of body fluids, and reaction environment.
Which of these did your answer include?
Water serves a variety of functions in living things. Water helps to support the bodies of some organisms. Water provides temperature regulation for many organisms. Water provides ideal reaction conditions for many biological processes.
Which example best shows that the chemistry of water is helpful to plants?
Water's polarity causes cohesion that pulls other water molecules up through a plant.
Which is the best example of water regulating an organism's body temperature?
a jogger sweating after a run
When water dissolves salt, which process is not involved? When water dissolves sugar, which process is not involved?
ionization dissociation
