Questions and Answers
Why does salt dissolve in water?
Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
Why does olive oil not dissolve in water?
Olive oil is non-polar and the molecules of oil and water aren't attracted to each other.
Is the pH of salt water more acidic or basic?
pH is 8, it is more basic.
What do acids and bases release?
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When making Kool-Aid, what is the solvent and what is the solute?
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What is the difference between a solution and a suspension?
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Give an example of surface tension.
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What is cohesion in water?
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What is adhesion in water?
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Coconut oil is polar.
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Study Notes
Dissolving Properties
- Salt dissolves in water due to the polarity of water molecules, where positive ends attract chloride ions and negative ends attract sodium ions.
- Olive oil does not dissolve in water because it is non-polar; oil and water molecules lack attraction to each other.
pH and Basicity
- Saltwater has a pH of 8, indicating it is more basic, characterized by a higher concentration of hydroxide ions compared to hydrogen ions.
Acids and Bases
- Acids release hydrogen ions (H+) in solution.
- Bases release hydroxide ions (OH-) when dissolved in water.
Solution vs. Suspension
- A solution is a homogeneous mixture, exemplified by Kool-Aid, where water acts as the solvent and Kool-Aid mix is the solute.
- A suspension is a heterogeneous mixture, where particles like sand in water remain separate and do not combine.
Surface Tension
- Surface tension is observed in water where insects can walk on its surface, demonstrating cohesion among water molecules.
Cohesion and Adhesion
- Cohesion refers to water molecules bonding to each other, contributing to surface tension.
- Adhesion is the ability of water to form hydrogen bonds with other surfaces, showing attraction beyond just water molecules.
Coconut Oil Characteristics
- Coconut oil is classified as non-polar, further emphasizing its inability to mix with polar substances like water.
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Description
Test your knowledge on the properties of solutions, including how different substances like salt and oil interact with water. Additionally, explore the concepts of pH, acidity, and basicity, as well as the difference between solutions and suspensions. This quiz covers key chemistry concepts important for understanding chemical reactions and mixtures.
