Honors Biology worksheet reviewing water and solutions, including definitions and diagrams.
A worksheet from Eastern Intermediate High School Honors Biology, Unit 2 - Inorganic Chemistry, titled "Review of Water and Solutions," featuring questions on water structure, hydrogen bonds, solutions, solutes, solvents, and acids.
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Step-by-step solution for: Worksheet - Review of Water and Solutions
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Step-by-step solution for: Worksheet - Review of Water and Solutions
Here’s a complete, clear, and accurate solution to your Honors Biology – Unit 2: Inorganic Chemistry – Review of Water and Solutions worksheet.
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*(Since I can’t draw here, I’ll describe it in detail so you can draw it accurately.)*
- Shape: Bent (V-shaped), with a bond angle of approximately 104.5°.
- Atoms: One oxygen atom (O) bonded to two hydrogen atoms (H).
- Electronegativity: Oxygen is more electronegative than hydrogen → pulls electrons closer → creates partial negative charge (δ⁻) on O, partial positive charges (δ⁺) on each H.
- Polarity: The molecule is polar because of its bent shape and unequal sharing of electrons.
✔ Labeling:
- Write “O” for oxygen at the center.
- Write “H” for each hydrogen at the ends of the bonds.
- Place δ⁺ near each H.
- Place δ⁻ near the O.
- Draw the bent angle clearly — not linear!
*(Tip: Use a Lewis dot structure if required — O with 2 lone pairs, single bonds to each H.)*
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> A hydrogen bond is a special type of intermolecular attraction that occurs when a hydrogen atom covalently bonded to a highly electronegative atom (like O, N, or F) is attracted to another nearby electronegative atom. It is weaker than a covalent bond but stronger than van der Waals forces.
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> A solution is a homogeneous mixture composed of two or more substances. In a solution, one substance (the solute) is dissolved in another (the solvent).
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> A solute is the substance that is dissolved in a solvent to form a solution. It is usually present in smaller amounts.
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> A solvent is the substance in which the solute dissolves. It is usually present in greater quantity and determines the physical state of the solution.
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> In a sugar-water solution:
> - Solute = Sugar (dissolves into water)
> - Solvent = Water (does the dissolving)
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> Water is a polar molecule with partial charges (δ⁺ on H, δ⁻ on O). When an ionic compound (like NaCl) is placed in water, the positively charged ions (e.g., Na⁺) are attracted to the δ⁻ oxygen atoms of water, and the negatively charged ions (e.g., Cl⁻) are attracted to the δ⁺ hydrogen atoms. This surrounds and separates the ions — a process called hydration — allowing the compound to dissolve.
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> Water is called the “universal solvent” because it can dissolve more substances than any other liquid. This is due to its polarity and ability to form hydrogen bonds, which allow it to interact with and pull apart many different types of molecules — including salts, sugars, acids, bases, and even some gases. Its versatility makes it essential for biological and chemical processes.
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> Cohesion is the attraction between molecules of the same substance. In water, cohesion occurs due to hydrogen bonding between adjacent water molecules. This gives water properties like high surface tension, capillary action, and the ability to form droplets. Cohesion helps water move upward through plant xylem and allows insects to walk on water.
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> An acid is a substance that donates protons (H⁺ ions) when dissolved in water. Acids increase the concentration of H⁺ ions in a solution, resulting in a pH less than 7. They taste sour, turn blue litmus paper red, and react with bases to form salts and water (neutralization). Examples: HCl (hydrochloric acid), H₂SO₄ (sulfuric acid), CH₃COOH (acetic acid).
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✔ Bonus Tip for Study:
Water’s unique properties (cohesion, adhesion, high specific heat, solvent ability) all stem from its polarity and hydrogen bonding — these are key for biology!
Let me know if you’d like printable notes or diagrams for your worksheet!
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1. Draw and label the structure of a polar water molecule:
*(Since I can’t draw here, I’ll describe it in detail so you can draw it accurately.)*
- Shape: Bent (V-shaped), with a bond angle of approximately 104.5°.
- Atoms: One oxygen atom (O) bonded to two hydrogen atoms (H).
- Electronegativity: Oxygen is more electronegative than hydrogen → pulls electrons closer → creates partial negative charge (δ⁻) on O, partial positive charges (δ⁺) on each H.
- Polarity: The molecule is polar because of its bent shape and unequal sharing of electrons.
✔ Labeling:
- Write “O” for oxygen at the center.
- Write “H” for each hydrogen at the ends of the bonds.
- Place δ⁺ near each H.
- Place δ⁻ near the O.
- Draw the bent angle clearly — not linear!
*(Tip: Use a Lewis dot structure if required — O with 2 lone pairs, single bonds to each H.)*
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2. Define a Hydrogen Bond.
> A hydrogen bond is a special type of intermolecular attraction that occurs when a hydrogen atom covalently bonded to a highly electronegative atom (like O, N, or F) is attracted to another nearby electronegative atom. It is weaker than a covalent bond but stronger than van der Waals forces.
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3. Define a Solution.
> A solution is a homogeneous mixture composed of two or more substances. In a solution, one substance (the solute) is dissolved in another (the solvent).
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4. Define a Solute.
> A solute is the substance that is dissolved in a solvent to form a solution. It is usually present in smaller amounts.
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5. Define a Solvent.
> A solvent is the substance in which the solute dissolves. It is usually present in greater quantity and determines the physical state of the solution.
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6. Match water and sugar with solute and solvent.
> In a sugar-water solution:
> - Solute = Sugar (dissolves into water)
> - Solvent = Water (does the dissolving)
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7. Ionic compounds dissolve best in water. Describe why this occurs:
> Water is a polar molecule with partial charges (δ⁺ on H, δ⁻ on O). When an ionic compound (like NaCl) is placed in water, the positively charged ions (e.g., Na⁺) are attracted to the δ⁻ oxygen atoms of water, and the negatively charged ions (e.g., Cl⁻) are attracted to the δ⁺ hydrogen atoms. This surrounds and separates the ions — a process called hydration — allowing the compound to dissolve.
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8. Describe why water is the “universal solvent.”
> Water is called the “universal solvent” because it can dissolve more substances than any other liquid. This is due to its polarity and ability to form hydrogen bonds, which allow it to interact with and pull apart many different types of molecules — including salts, sugars, acids, bases, and even some gases. Its versatility makes it essential for biological and chemical processes.
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9. Define and describe cohesion.
> Cohesion is the attraction between molecules of the same substance. In water, cohesion occurs due to hydrogen bonding between adjacent water molecules. This gives water properties like high surface tension, capillary action, and the ability to form droplets. Cohesion helps water move upward through plant xylem and allows insects to walk on water.
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10. Define and describe an acid.
> An acid is a substance that donates protons (H⁺ ions) when dissolved in water. Acids increase the concentration of H⁺ ions in a solution, resulting in a pH less than 7. They taste sour, turn blue litmus paper red, and react with bases to form salts and water (neutralization). Examples: HCl (hydrochloric acid), H₂SO₄ (sulfuric acid), CH₃COOH (acetic acid).
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✔ Bonus Tip for Study:
Water’s unique properties (cohesion, adhesion, high specific heat, solvent ability) all stem from its polarity and hydrogen bonding — these are key for biology!
Let me know if you’d like printable notes or diagrams for your worksheet!
Parent Tip: Review the logic above to help your child master the concept of water and solutions worksheet.
