SC.912.L.18.1 Exploring Water's Impact on Life

Which part of a water molecule is more negatively charged due to its higher electronegativity?

• The hydrogen atoms

• The oxygen atom

• Both hydrogen and oxygen equally

• The entire molecule is neutral

What type of bond forms between the hydrogen atom of one water molecule and the oxygen atom of another water molecule?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

Which property of water is directly caused by its polarity?

• High boiling point

• Ability to dissolve many substances

• Low density as a solid

• Colorless appearance

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What does it mean when we say water is a "polar" molecule?

• It has equal sharing of electrons

• It has a positive and a negative end

• It is always in the solid state

• It cannot form hydrogen bonds

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Which of the following best explains why water can dissolve ionic compounds like salt?

• Water is nonpolar and repels ions

• Water’s polarity allows it to surround and separate ions

• Water forms covalent bonds with salt

• Water evaporates quickly

How does the polarity of water contribute to its role as a temperature buffer in organisms?

• It allows water to freeze at high temperatures

• It enables water to absorb and release heat slowly

• It makes water evaporate instantly

• It prevents water from mixing with other substances

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Why do oil and water not mix, based on water’s polarity?

• Oil is polar and repels water

• Oil is nonpolar and does not interact with polar water molecules

• Water is nonpolar and cannot dissolve oil

• Oil forms hydrogen bonds with water

Which of the following is a direct effect of water’s polarity on living organisms?

• Water is always solid at room temperature

• Water can transport nutrients and waste in cells

• Water cannot dissolve gases

• Water is a poor solvent

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A student observes that water droplets form on a leaf after rain. Which property of water, resulting from its polarity, explains this observation?

• Cohesion

• Transparency

• Density

• Odor

Which statement best describes how water’s polarity affects the structure of proteins in living organisms?

• Water’s polarity causes proteins to dissolve completely

• Water’s polarity helps proteins fold into specific shapes by interacting with charged and polar side chains

• Water’s polarity prevents proteins from forming

• Water’s polarity has no effect on proteins