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Questions and Answers
A water molecule is composed of one oxygen atom and how many hydrogen atoms?
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.
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 ______.
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?
Which property of water is responsible for water's ability to be drawn up a plant from its roots to its leaves?
Surface tension in water is caused by ionic bonds between water molecules.
Surface tension in water is caused by ionic bonds between water molecules.
Explain how the polarity of water molecules contributes to water's ability to dissolve a wide range of substances.
Explain how the polarity of water molecules contributes to water's ability to dissolve a wide range of substances.
Match the following properties of water with their descriptions:
Match the following properties of water with their descriptions:
Which of the following is a direct consequence of water's high surface tension?
Which of the following is a direct consequence of water's high surface tension?
Cohesion allows water molecules to stick to the walls of plant vessels, which helps water travel upwards.
Cohesion allows water molecules to stick to the walls of plant vessels, which helps water travel upwards.
The ability of water to flow upward against gravity due to cohesion and adhesion is known as ______ action.
The ability of water to flow upward against gravity due to cohesion and adhesion is known as ______ action.
Considering water's properties, which of the following scenarios is least likely to occur?
Considering water's properties, which of the following scenarios is least likely to occur?
If a substance is described as a 'solute', this means that it's a liquid that dissolves other particles.
If a substance is described as a 'solute', this means that it's a liquid that dissolves other particles.
Explain why water is often called the 'universal solvent'. Is this title entirely accurate?
Explain why water is often called the 'universal solvent'. Is this title entirely accurate?
Which statement best describes the relationship between cohesion and adhesion in water?
Which statement best describes the relationship between cohesion and adhesion in water?
The slightly positive end of one water molecule is attracted to the slightly positive end of another water molecule.
The slightly positive end of one water molecule is attracted to the slightly positive end of another water molecule.
Hydrogen bonds between water molecules at the surface resist breaking, creating an 'invisible film', this is known as ______ ______.
Hydrogen bonds between water molecules at the surface resist breaking, creating an 'invisible film', this is known as ______ ______.
Of the options given, which one contributes the LEAST to water's ability to dissolve many, but not all, substances?
Of the options given, which one contributes the LEAST to water's ability to dissolve many, but not all, substances?
Bears dissolve in water because they are polar.
Bears dissolve in water because they are polar.
Match what happens to water based on the properties of water:
Match what happens to water based on the properties of water:
How do both cohesion and adhesion contribute to the survival and sustainability of aquatic plants and habitats?
How do both cohesion and adhesion contribute to the survival and sustainability of aquatic plants and habitats?
Which property of water makes it valuable as a coolant in manufacturing processes?
Which property of water makes it valuable as a coolant in manufacturing processes?
In the solid phase, water molecules are widely spaced apart with no regular arrangement.
In the solid phase, water molecules are widely spaced apart with no regular arrangement.
Explain why ice is less dense than liquid water.
Explain why ice is less dense than liquid water.
The amount of energy required to change the temperature of a substance is known as its ______.
The amount of energy required to change the temperature of a substance is known as its ______.
Match the state of water with the arrangement and movement of its molecules:
Match the state of water with the arrangement and movement of its molecules:
What happens to water molecules as water changes from a liquid to a gas?
What happens to water molecules as water changes from a liquid to a gas?
Land absorbs heat faster than water.
Land absorbs heat faster than water.
Describe the arrangement of water molecules in the liquid phase.
Describe the arrangement of water molecules in the liquid phase.
Water molecules move to a more active state as the ______ rises.
Water molecules move to a more active state as the ______ rises.
Which of the following is a characteristic of solids?
Which of the following is a characteristic of solids?
Water boils at 200°F or 100°C
Water boils at 200°F or 100°C
What is kinetic energy?
What is kinetic energy?
In a car, water is a ______, absorbing the heat from the engine.
In a car, water is a ______, absorbing the heat from the engine.
Which state of matter assumes the shape of its container but retains a fixed volume?
Which state of matter assumes the shape of its container but retains a fixed volume?
The particles of a liquid vibrate, move about, and slide past each other.
The particles of a liquid vibrate, move about, and slide past each other.
What determines the state (solid, liquid, or gas) of water?
What determines the state (solid, liquid, or gas) of water?
Ice has a regular pattern with the molecules held rigidly apart by their bonds, which causes a ______ structure.
Ice has a regular pattern with the molecules held rigidly apart by their bonds, which causes a ______ structure.
Match the following terms with their descriptions:
Match the following terms with their descriptions:
Which of the following best describes the movement of gas particles?
Which of the following best describes the movement of gas particles?
Solid water or ice sinks to the bottom as it is denser than liquid water.
Solid water or ice sinks to the bottom as it is denser than liquid water.
Flashcards
Water Molecule Composition
Water Molecule Composition
Water is composed of 1 oxygen atom and 2 hydrogen atoms.
Polar Molecule
Polar Molecule
A molecule with slightly positive and slightly negative charged ends.
Polarity Attraction
Polarity Attraction
The attraction between the negative end of one water molecule and the positive end of another.
Solvent
Solvent
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Solute
Solute
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Universal Solvent Property
Universal Solvent Property
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Capillary Action
Capillary Action
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Cohesion Definition
Cohesion Definition
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Adhesion Definition
Adhesion Definition
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Surface Tension
Surface Tension
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Cause of Surface Tension
Cause of Surface Tension
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What is the boiling point of water?
What is the boiling point of water?
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What is the freezing point of water?
What is the freezing point of water?
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What is specific heat?
What is specific heat?
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What is a coolant?
What is a coolant?
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What is kinetic energy?
What is kinetic energy?
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What are the three states of water?
What are the three states of water?
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What changes when water changes phase?
What changes when water changes phase?
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What is the particle arrangement of water as a gas?
What is the particle arrangement of water as a gas?
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What is the particle arrangement of water as a liquid?
What is the particle arrangement of water as a liquid?
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What is the particle arrangement of water as a solid?
What is the particle arrangement of water as a solid?
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Why does water have a high specific heat index?
Why does water have a high specific heat index?
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What is the gas state of water?
What is the gas state of water?
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What is a solid?
What is a solid?
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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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