AP Biology Flashcards: Structure Of Water And Hydrogen Bonding

What this deck covers

This deck focuses on Structure Of Water And Hydrogen Bonding, giving you a quick way to review the definitions, rules, and examples that matter most for AP Biology.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Which type of bond holds the hydrogen and oxygen atoms together in a water molecule?

Answer: Covalent bond. Electrons are shared between atoms within the molecule.

Flashcard 2: What causes the meniscus seen in a graduated cylinder with water?

Answer: Adhesion. Water molecules attract to glass surfaces more than to each other.

Flashcard 3: What kind of interaction is primarily responsible for water's cohesive properties?

Answer: Hydrogen bonding. Intermolecular forces between water molecules.

Flashcard 4: What is the structural shape of a water molecule?

Answer: Bent or V-shaped. Lone pairs on oxygen create angular geometry.

Flashcard 5: What is the angle between the hydrogen atoms in a water molecule?

Answer: 104.5 degrees. The bent molecular geometry creates this specific bond angle.

Flashcard 6: Which property of water allows it to form droplets on leaves?

Answer: Cohesion. Intermolecular attraction pulls molecules into spherical shapes.

Flashcard 7: Which property of water allows it to form droplets on leaves?

Answer: Cohesion. Intermolecular attraction pulls molecules into spherical shapes.

Flashcard 8: What allows water to adhere to plant cell walls?

Answer: Adhesion. Attraction between water and polar cell wall components.

Flashcard 9: Why is the specific heat of water important for aquatic life?

Answer: It stabilizes temperatures in aquatic environments. Prevents harmful temperature swings in aquatic habitats.

Flashcard 10: Why is the specific heat of water important for aquatic life?

Answer: It stabilizes temperatures in aquatic environments. Prevents harmful temperature swings in aquatic habitats.

Flashcard 11: Which property of water helps maintain homeostasis in organisms?

Answer: High heat capacity. Prevents rapid temperature changes that could harm cells.

Flashcard 12: What type of molecule is water due to its unequal distribution of charges?

Answer: Polar molecule. Unequal electron distribution creates positive and negative ends.

Flashcard 13: What is the structural shape of a water molecule?

Answer: Bent or V-shaped. Lone pairs on oxygen create angular geometry.

Flashcard 14: Which property of water is involved in sweating as a cooling mechanism?

Answer: High heat of vaporization. Large energy requirement for evaporation removes body heat effectively.

Flashcard 15: What is the cause of water's lower density in solid form compared to liquid?

Answer: Hydrogen bonds form a lattice in ice. Rigid crystal structure creates spaces, reducing density.

Flashcard 16: Which property of water contributes to its role in chemical reactions?

Answer: Solvent properties. Dissolves reactants and facilitates molecular interactions.

Flashcard 17: Why does water have a high heat of fusion?

Answer: Due to hydrogen bonding. Energy required to break bonds during melting phase transition.

Flashcard 18: What is responsible for water's high surface tension?

Answer: Cohesion due to hydrogen bonding. Intermolecular attraction creates resistance at the surface.

Flashcard 19: What is the molecular formula for water?

Answer: H₂O. Contains two hydrogen atoms and one oxygen atom.

Flashcard 20: What is the reason for water's high heat of vaporization?

Answer: Hydrogen bonding. Energy required to break multiple hydrogen bonds during vaporization.

Flashcard 21: What type of molecule is water due to its unequal distribution of charges?

Answer: Polar molecule. Unequal electron distribution creates positive and negative ends.

Flashcard 22: Why does water have a high heat of fusion?

Answer: Due to hydrogen bonding. Energy required to break bonds during melting phase transition.

Flashcard 23: What is the angle between the hydrogen atoms in a water molecule?

Answer: 104.5 degrees. The bent molecular geometry creates this specific bond angle.

Flashcard 24: Identify the partial charges on oxygen and hydrogen in water.

Answer: Oxygen is partially negative; hydrogen is partially positive. Oxygen pulls electrons more strongly, creating polarity.

Flashcard 25: Which property of water allows insects to walk on its surface?

Answer: Surface tension. Cohesive forces create a strong interface between water and air.

Flashcard 26: What is the role of hydrogen bonds in water's high heat capacity?

Answer: They absorb heat when breaking and release heat when forming. Energy storage in bond formation/breaking moderates temperature change.

Flashcard 27: Which feature of water allows it to stabilize temperature in environments?

Answer: High heat capacity. Hydrogen bonds absorb energy during temperature fluctuations.

Flashcard 28: Which property of water is involved in sweating as a cooling mechanism?

Answer: High heat of vaporization. Large energy requirement for evaporation removes body heat effectively.

Flashcard 29: What is the molecular formula for water?

Answer: H₂O. Contains two hydrogen atoms and one oxygen atom.

Flashcard 30: What describes the ability of water to resist changes in temperature?

Answer: Thermal stability. High heat capacity prevents rapid temperature fluctuations.

Flashcard 31: What kind of interaction is primarily responsible for water's cohesive properties?

Answer: Hydrogen bonding. Intermolecular forces between water molecules.

Flashcard 32: What is the role of hydrogen bonds in water's high heat capacity?

Answer: They absorb heat when breaking and release heat when forming. Energy storage in bond formation/breaking moderates temperature change.

Flashcard 33: What type of bond forms between water molecules?

Answer: Hydrogen bond. Forms between the partial positive H and partial negative O of adjacent molecules.

Flashcard 34: What is the term for the attraction between water molecules and other substances?

Answer: Adhesion. Water molecules attract to different polar or charged surfaces.

Flashcard 35: Which term describes water's ability to dissolve many substances?

Answer: Universal solvent. Polarity allows it to dissolve ionic and polar substances.

Flashcard 36: What is the primary reason ice floats on water?

Answer: Ice is less dense due to hydrogen bonding. Crystal structure in ice creates less dense arrangement than liquid.

Flashcard 37: Which type of bond holds the hydrogen and oxygen atoms together in a water molecule?

Answer: Covalent bond. Electrons are shared between atoms within the molecule.

Flashcard 38: Why is water considered a polar molecule?

Answer: Unequal sharing of electrons between oxygen and hydrogen. Oxygen's higher electronegativity creates charge separation.

Flashcard 39: What property of water leads to surface tension?

Answer: Cohesion. Attraction between water molecules creates surface resistance.

Flashcard 40: Identify the partial charges on oxygen and hydrogen in water.

Answer: Oxygen is partially negative; hydrogen is partially positive. Oxygen pulls electrons more strongly, creating polarity.

Flashcard 41: What is the charge distribution in a water molecule?

Answer: Polar, with partial negative on oxygen and partial positive on hydrogens. Electronegativity difference creates dipole moment.

Flashcard 42: Which term describes water's ability to dissolve many substances?

Answer: Universal solvent. Polarity allows it to dissolve ionic and polar substances.

Flashcard 43: Which property of water helps in nutrient transport in organisms?

Answer: Solvent properties. Polarity allows dissolution and transport of nutrients.

Flashcard 44: What causes the meniscus seen in a graduated cylinder with water?

Answer: Adhesion. Water molecules attract to glass surfaces more than to each other.

Flashcard 45: What is responsible for water's high surface tension?

Answer: Cohesion due to hydrogen bonding. Intermolecular attraction creates resistance at the surface.

Flashcard 46: Which property of water contributes to its role in chemical reactions?

Answer: Solvent properties. Dissolves reactants and facilitates molecular interactions.

Flashcard 47: What type of bond forms between water molecules?

Answer: Hydrogen bond. Forms between the partial positive H and partial negative O of adjacent molecules.

Flashcard 48: Which property of water allows insects to walk on its surface?

Answer: Surface tension. Cohesive forces create a strong interface between water and air.

Flashcard 49: What allows water to adhere to plant cell walls?

Answer: Adhesion. Attraction between water and polar cell wall components.

Flashcard 50: How many hydrogen bonds can a single water molecule form?

Answer: Four hydrogen bonds. Two from hydrogens and two from lone pairs on oxygen.

Flashcard 51: What describes the ability of water to resist changes in temperature?

Answer: Thermal stability. High heat capacity prevents rapid temperature fluctuations.

Flashcard 52: Which feature of water allows it to stabilize temperature in environments?

Answer: High heat capacity. Hydrogen bonds absorb energy during temperature fluctuations.

Flashcard 53: What property of water leads to surface tension?

Answer: Cohesion. Attraction between water molecules creates surface resistance.

Flashcard 54: Which property of water helps in nutrient transport in organisms?

Answer: Solvent properties. Polarity allows dissolution and transport of nutrients.

Flashcard 55: Why is water considered a polar molecule?

Answer: Unequal sharing of electrons between oxygen and hydrogen. Oxygen's higher electronegativity creates charge separation.

Flashcard 56: What is the charge distribution in a water molecule?

Answer: Polar, with partial negative on oxygen and partial positive on hydrogens. Electronegativity difference creates dipole moment.

Flashcard 57: Which property of water helps maintain homeostasis in organisms?

Answer: High heat capacity. Prevents rapid temperature changes that could harm cells.

Flashcard 58: What is the cause of water's lower density in solid form compared to liquid?

Answer: Hydrogen bonds form a lattice in ice. Rigid crystal structure creates spaces, reducing density.

Flashcard 59: What is the reason for water's high heat of vaporization?

Answer: Hydrogen bonding. Energy required to break multiple hydrogen bonds during vaporization.

Flashcard 60: How many hydrogen bonds can a single water molecule form?

Answer: Four hydrogen bonds. Two from hydrogens and two from lone pairs on oxygen.

Flashcard 61: What is the term for the attraction between water molecules and other substances?

Answer: Adhesion. Water molecules attract to different polar or charged surfaces.