Amoeba Sisters worksheet on the properties of water, covering polarity, solvent ability, adhesion, cohesion, and hydrogen bonding with educational diagrams.
Worksheet titled "Amoeba Sisters Video Recap: Properties of Water" with four sections explaining water's polarity, solvent properties, adhesion and cohesion in plants, and hydrogen bonds. Includes diagrams of water molecules, a plant xylem, and a water strider on water surface.
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Step-by-step solution for: 50 Free Printable Properties of Water Worksheet Collection
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Show Answer Key & Explanations
Step-by-step solution for: 50 Free Printable Properties of Water Worksheet Collection
Let's go through each question on the "Amoeba Sisters Video Select Recap: Properties of Water" worksheet and provide clear, accurate answers with explanations.
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Answer:
In a water molecule (H₂O), oxygen is more electronegative than hydrogen. This means oxygen has a stronger pull on the shared electrons in the covalent bonds between oxygen and hydrogen atoms. As a result, the electrons spend more time near the oxygen atom, giving it a partial negative charge (δ⁻), while the hydrogen atoms become partially positive (δ⁺).
This uneven distribution of electron density creates a polar molecule, where one end (the oxygen side) is slightly negative and the other end (the hydrogen side) is slightly positive. The cartoon shows this with the oxygen atom pulling electrons away from the hydrogens, causing the "electrons to run away" and creating the polarity.
> 🔍 Key Point: The bent shape of the water molecule also enhances its polarity because the partial charges don't cancel out.
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Answer:
Water acts as a universal solvent because its polarity allows it to dissolve many substances, especially polar or ionic compounds. For example, sugars and salts dissolve easily in water.
An important example in living organisms is that water dissolves nutrients and ions in blood and cellular fluids, allowing them to be transported throughout the body. For instance, glucose (a sugar) dissolves in blood plasma so it can be delivered to cells for energy production. Similarly, ions like sodium (Na⁺) and chloride (Cl⁻) are dissolved in water in bodily fluids, which helps maintain proper nerve function and fluid balance.
> 🌱 Why it matters: Without water’s ability to act as a solvent, essential biochemical reactions couldn’t occur efficiently inside cells.
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Answer:
- Cohesion: The attraction between water molecules due to hydrogen bonding. Water molecules stick to each other.
- Adhesion: The attraction between water molecules and other substances (like the walls of xylem vessels).
These two properties are crucial for water transport in plants. In the diagram:
- Cohesion allows water molecules to form a continuous column in the xylem tubes.
- Adhesion helps water stick to the sides of the xylem vessel, helping it move upward against gravity.
Together, these forces enable capillary action, which assists in pulling water up from the roots to the leaves, even in tall trees. This process is part of transpiration pull, where water evaporates from leaves, creating a suction that pulls more water up from the roots.
> 💡 Summary: Cohesion keeps water molecules together; adhesion helps them cling to the xylem walls—both are essential for moving water upward in plants.
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Answer:
The image shows cohesion—the tendency of water molecules to stick to each other. This is demonstrated by the water strider walking on water and the droplet forming a spherical shape.
Hydrogen bonds are responsible for this cohesion. Each water molecule can form hydrogen bonds with neighboring water molecules. These bonds are relatively strong compared to other types of intermolecular forces, allowing water molecules to hold onto each other tightly.
Because of this cohesive force:
- Water forms droplets instead of spreading out.
- It supports small insects like water striders on its surface (surface tension).
- It contributes to capillary action and water transport in plants.
> 🧪 Surface Tension Connection: The strong hydrogen bonding at the surface creates a "skin" effect, enabling objects lighter than water to rest on top without sinking.
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| Question | Key Concept |
|--------|-------------|
| 1 | Polarity due to electronegativity difference between O and H |
| 2 | Water dissolves substances → enables nutrient transport |
| 3 | Cohesion & adhesion → help move water in plants via xylem |
| 4 | Cohesion & hydrogen bonding → create surface tension and support life |
These properties make water essential for life!
Let me know if you'd like this formatted into a printable answer sheet!
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1. The molecule of water is described as a polar molecule. Polar molecules have an unequal sharing of electrons. Explain how this unequal sharing is present by using our water molecule graphic below.
Answer:
In a water molecule (H₂O), oxygen is more electronegative than hydrogen. This means oxygen has a stronger pull on the shared electrons in the covalent bonds between oxygen and hydrogen atoms. As a result, the electrons spend more time near the oxygen atom, giving it a partial negative charge (δ⁻), while the hydrogen atoms become partially positive (δ⁺).
This uneven distribution of electron density creates a polar molecule, where one end (the oxygen side) is slightly negative and the other end (the hydrogen side) is slightly positive. The cartoon shows this with the oxygen atom pulling electrons away from the hydrogens, causing the "electrons to run away" and creating the polarity.
> 🔍 Key Point: The bent shape of the water molecule also enhances its polarity because the partial charges don't cancel out.
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2. Water is an excellent solvent. With water being a polar molecule, it can be an especially strong solvent for other polar molecules. Give an example of how water acting as a solvent is important for living organisms.
Answer:
Water acts as a universal solvent because its polarity allows it to dissolve many substances, especially polar or ionic compounds. For example, sugars and salts dissolve easily in water.
An important example in living organisms is that water dissolves nutrients and ions in blood and cellular fluids, allowing them to be transported throughout the body. For instance, glucose (a sugar) dissolves in blood plasma so it can be delivered to cells for energy production. Similarly, ions like sodium (Na⁺) and chloride (Cl⁻) are dissolved in water in bodily fluids, which helps maintain proper nerve function and fluid balance.
> 🌱 Why it matters: Without water’s ability to act as a solvent, essential biochemical reactions couldn’t occur efficiently inside cells.
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3. The below picture shows water’s ability for adhesion and cohesion. Define adhesion and cohesion and explain why they are important for the plant in the graphic below.
Answer:
- Cohesion: The attraction between water molecules due to hydrogen bonding. Water molecules stick to each other.
- Adhesion: The attraction between water molecules and other substances (like the walls of xylem vessels).
These two properties are crucial for water transport in plants. In the diagram:
- Cohesion allows water molecules to form a continuous column in the xylem tubes.
- Adhesion helps water stick to the sides of the xylem vessel, helping it move upward against gravity.
Together, these forces enable capillary action, which assists in pulling water up from the roots to the leaves, even in tall trees. This process is part of transpiration pull, where water evaporates from leaves, creating a suction that pulls more water up from the roots.
> 💡 Summary: Cohesion keeps water molecules together; adhesion helps them cling to the xylem walls—both are essential for moving water upward in plants.
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4. Describe the property of water being shown below. How do water’s hydrogen bonds contribute to this property?
Answer:
The image shows cohesion—the tendency of water molecules to stick to each other. This is demonstrated by the water strider walking on water and the droplet forming a spherical shape.
Hydrogen bonds are responsible for this cohesion. Each water molecule can form hydrogen bonds with neighboring water molecules. These bonds are relatively strong compared to other types of intermolecular forces, allowing water molecules to hold onto each other tightly.
Because of this cohesive force:
- Water forms droplets instead of spreading out.
- It supports small insects like water striders on its surface (surface tension).
- It contributes to capillary action and water transport in plants.
> 🧪 Surface Tension Connection: The strong hydrogen bonding at the surface creates a "skin" effect, enabling objects lighter than water to rest on top without sinking.
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✔ Final Summary:
| Question | Key Concept |
|--------|-------------|
| 1 | Polarity due to electronegativity difference between O and H |
| 2 | Water dissolves substances → enables nutrient transport |
| 3 | Cohesion & adhesion → help move water in plants via xylem |
| 4 | Cohesion & hydrogen bonding → create surface tension and support life |
These properties make water essential for life!
Let me know if you'd like this formatted into a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of water properties worksheet.
