Properties of Water

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Questions and Answers

A water molecule is composed of one oxygen atom and how many hydrogen atoms?

  • 4
  • 3
  • 1
  • 2 (correct)

Water is a nonpolar molecule, meaning it does not have slightly positive or slightly negative charges.

False (B)

A substance that dissolves another substance is known as a ______.

solvent

Which property of water is responsible for water's ability to be drawn up a plant from its roots to its leaves?

<p>Cohesion and adhesion (A)</p> Signup and view all the answers

Surface tension in water is caused by ionic bonds between water molecules.

<p>False (B)</p> Signup and view all the answers

Explain how the polarity of water molecules contributes to water's ability to dissolve a wide range of substances.

<p>The slight positive and negative charges on water molecules allow them to interact with and pull apart other polar molecules and ionic compounds, effectively dissolving them.</p> Signup and view all the answers

Match the following properties of water with their descriptions:

<p>Cohesion = Water molecules sticking together Adhesion = Water molecules sticking to other substances Surface tension = The property of the surface of a liquid that allows it to resist an external force Polarity = A molecule with slightly positive and slightly negative charges</p> Signup and view all the answers

Which of the following is a direct consequence of water's high surface tension?

<p>Insects walking on water (C)</p> Signup and view all the answers

Cohesion allows water molecules to stick to the walls of plant vessels, which helps water travel upwards.

<p>False (B)</p> Signup and view all the answers

The ability of water to flow upward against gravity due to cohesion and adhesion is known as ______ action.

<p>capillary</p> Signup and view all the answers

Considering water's properties, which of the following scenarios is least likely to occur?

<p>Oil dissolving in water. (D)</p> Signup and view all the answers

If a substance is described as a 'solute', this means that it's a liquid that dissolves other particles.

<p>False (B)</p> Signup and view all the answers

Explain why water is often called the 'universal solvent'. Is this title entirely accurate?

<p>Water is called the universal solvent because it can dissolve a wide range of substances due to its polarity. However, it cannot dissolve all substances, particularly nonpolar ones, so the title is not entirely accurate.</p> Signup and view all the answers

Which statement best describes the relationship between cohesion and adhesion in water?

<p>Cohesion involves water molecules sticking to each other, while adhesion involves them sticking to other substances. (D)</p> Signup and view all the answers

The slightly positive end of one water molecule is attracted to the slightly positive end of another water molecule.

<p>False (B)</p> Signup and view all the answers

Hydrogen bonds between water molecules at the surface resist breaking, creating an 'invisible film', this is known as ______ ______.

<p>surface tension</p> Signup and view all the answers

Of the options given, which one contributes the LEAST to water's ability to dissolve many, but not all, substances?

<p>Water's molecular structure (D)</p> Signup and view all the answers

Bears dissolve in water because they are polar.

<p>False (B)</p> Signup and view all the answers

Match what happens to water based on the properties of water:

<p>Water being a universal solvent: = Dissolving most solutes Capillary action: = Water gets to the top of plants Polarity: = Molecule with slightly positive and slightly negative charges Surface tension: = Insects to walk/run on water</p> Signup and view all the answers

How do both cohesion and adhesion contribute to the survival and sustainability of aquatic plants and habitats?

<p>Cohesion and adhesion contribute to the structural integrity and the movement of water through an aquatic system.</p> Signup and view all the answers

Which property of water makes it valuable as a coolant in manufacturing processes?

<p>High specific heat index (B)</p> Signup and view all the answers

In the solid phase, water molecules are widely spaced apart with no regular arrangement.

<p>False (B)</p> Signup and view all the answers

Explain why ice is less dense than liquid water.

<p>Ice forms a crystalline lattice structure with open spaces, making it less dense than liquid water.</p> Signup and view all the answers

The amount of energy required to change the temperature of a substance is known as its ______.

<p>specific heat</p> Signup and view all the answers

Match the state of water with the arrangement and movement of its molecules:

<p>Solid = Tightly packed, little vibration Liquid = Close together, slide past each other Gas = Widely separated, very active</p> Signup and view all the answers

What happens to water molecules as water changes from a liquid to a gas?

<p>They become more widely spaced and active. (A)</p> Signup and view all the answers

Land absorbs heat faster than water.

<p>True (A)</p> Signup and view all the answers

Describe the arrangement of water molecules in the liquid phase.

<p>Water molecules in the liquid phase are close together with no regular arrangement, and they slide past each other.</p> Signup and view all the answers

Water molecules move to a more active state as the ______ rises.

<p>temperature</p> Signup and view all the answers

Which of the following is a characteristic of solids?

<p>Particles are tightly packed (B)</p> Signup and view all the answers

Water boils at 200°F or 100°C

<p>False (B)</p> Signup and view all the answers

What is kinetic energy?

<p>Kinetic energy is the energy of motion, reflected in how actively molecules move.</p> Signup and view all the answers

In a car, water is a ______, absorbing the heat from the engine.

<p>coolant</p> Signup and view all the answers

Which state of matter assumes the shape of its container but retains a fixed volume?

<p>Liquid (A)</p> Signup and view all the answers

The particles of a liquid vibrate, move about, and slide past each other.

<p>True (A)</p> Signup and view all the answers

What determines the state (solid, liquid, or gas) of water?

<p>The arrangement and movement of water molecules determine its state.</p> Signup and view all the answers

Ice has a regular pattern with the molecules held rigidly apart by their bonds, which causes a ______ structure.

<p>crystalline lattice</p> Signup and view all the answers

Match the following terms with their descriptions:

<p>Coolant = A substance used to absorb heat. Specific Heat = The amount of energy required to change the temperature of a substance. Kinetic Energy = The energy of motion of molecules.</p> Signup and view all the answers

Which of the following best describes the movement of gas particles?

<p>Very active (B)</p> Signup and view all the answers

Solid water or ice sinks to the bottom as it is denser than liquid water.

<p>False (B)</p> Signup and view all the answers

Flashcards

Water Molecule Composition

Water is composed of 1 oxygen atom and 2 hydrogen atoms.

Polar Molecule

A molecule with slightly positive and slightly negative charged ends.

Polarity Attraction

The attraction between the negative end of one water molecule and the positive end of another.

Solvent

A liquid that dissolves a particle (solute).

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Solute

A particle or liquid that gets dissolved in the solvent.

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Universal Solvent Property

Water's ability to dissolve most solutes.

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Capillary Action

Water's ability to flow upward against gravity due to cohesion and adhesion.

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Cohesion Definition

The property of water molecules sticking together.

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Adhesion Definition

The property of water molecules sticking to other, unlike molecules, against gravity.

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Surface Tension

A measure of the force necessary to stretch or break the surface of a liquid.

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Cause of Surface Tension

Hydrogen bonds between water molecules resist breaking, creating an 'invisible film'.

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What is the boiling point of water?

The temperature at which a liquid changes into a gas.

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What is the freezing point of water?

The temperature at which a liquid turns into a solid.

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What is specific heat?

The amount of energy required to raise the temperature of a substance.

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What is a coolant?

A substance that absorbs heat, cooling its surroundings.

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What is kinetic energy?

Energy of an object due to its motion.

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What are the three states of water?

Water exists as ice, liquid, and steam.

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What changes when water changes phase?

The arrangement and movement of particles.

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What is the particle arrangement of water as a gas?

Molecules are well separated with no regular arrangement.

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What is the particle arrangement of water as a liquid?

Molecules are close together with no regular arrangement.

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What is the particle arrangement of water as a solid?

Molecules are tightly packed in a regular pattern.

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Why does water have a high specific heat index?

Water is able to absorb a substantial amount of energy before its temperature increases significantly.

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What is the gas state of water?

The state of matter in which water molecules are widely separated and highly active.

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What is a solid?

The state of matter when water particles are tightly compacted with very little movement.

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Study Notes

  • Water has unique properties due to its unique structure.

Water Molecule Composition

  • It is made up of 1 oxygen atom and 2 hydrogen atoms

Polarity

  • It is a polar molecule with slightly positive and slightly negative charges.
  • The slightly negative end of one water molecule is attracted to the slightly positive end of a different water molecule.

Universal Solvent Characteristics

  • It is a universal solvent
  • Solvent: A liquid that dissolves a solute.
  • Solute: A particle or liquid that gets dissolved in a solvent.
  • Water can dissolve most solutes

Capillary Action Explained

  • It exhibits capillary action, allowing it to flow upward against gravity
  • Capillary action is due to cohesion and adhesion
  • Cohesion: Sticking together of two like molecules
  • Two water molecules are cohesive due to the hydrogen bonds
  • Adhesion: Sticking together of two unlike molecules
    • Example: water molecule attracted to a sugar molecule

Surface Tension

  • It has a high surface tension
  • Surface tension is a measure of the force necessary to stretch or break the surface of a liquid
  • Hydrogen bonds between water molecules at the surface resist breaking
  • Hydrogen bonds create an "invisible film" on water
  • Some insects can walk/run on water due to it

Physical States of Water

  • Exists in three states: solid (ice), liquid, and gas (steam)
  • Boils at 212°F or 100°C
  • Freezes at 32°F or 0°C

Specific Heat Index

  • Water has a high specific heat index
  • Specific heat: The amount of energy required to change the temperature of a substance
  • Water absorbs a lot of heat before it gets hot
  • Land absorbs heat faster than water
  • High specific heat makes water valuable to manufacturing companies
  • Acts as a coolant to absorb heat from machines and engines

Molecular Arrangement

  • Molecules rearrange in different patterns during phase changes
  • Liquid phase: molecules are close, no regular arrangement, vibrate, move, and slide
  • Solid phase: tightly packed, regular pattern, very little vibration or movement
  • Gaseous phase: widely spaced, very active, no regular arrangement
  • Kinetic energy refers to the movement of molecules
  • Matter becomes more active as temperature rises

Density of Water

  • Most substances are densest in solid form, but water is different
  • Ice floats because it is less dense than liquid water
  • Tightly packed ice molecules prevent shape changes
  • Ice forms a crystalline lattice structure with open spaces, making it less dense than liquid water.

States of Matter Comparison

  • Gas: well separated, no regular arrangement, assumes shape of container, very active, flows easily, volume of container
  • Liquid: close together, no regular arrangement, assumes shape of container, slide past each other, flows easily, fixed volume
  • Solid: tightly packed, regular pattern, retains fixed volume and shape, rigid, does not flow easily, fixed volume

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