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Sagot :
Answer:
1. Salt in Water
Prediction: The salt will dissolve completely in water.
Observation: After adding salt to water and stirring, the salt grains will disappear, leaving the water clear.
Explanation: Salt (sodium chloride) is made up of positive sodium ions (Na⁺) and negative chloride ions (Cl⁻). When salt is added to water, the polar water molecules surround these ions, breaking the ionic bonds in salt and causing it to dissolve. This process is known as dissolution, resulting in a homogeneous mixture or solution.
2. Coffee in Water
Prediction: The coffee will dissolve or disperse in water, forming a uniform mixture.
Observation: After adding coffee to water and stirring, the water will take on a brownish color, with the coffee evenly distributed.
Explanation: Coffee grounds contain water-soluble compounds that dissolve in water, such as caffeine, tannins, and other flavor compounds. When you stir coffee in water, these compounds dissolve, creating a uniform solution. However, if you use coffee grounds, some particles may not fully dissolve, resulting in a suspension.
3. Mud in Water
Prediction: The mud will not dissolve in water but will instead create a cloudy mixture.
Observation: After adding mud to water and stirring, the water will become murky or cloudy, and over time, the mud particles will begin to settle at the bottom.
Explanation: Mud is made up of small particles of soil, clay, and organic matter, which do not dissolve in water. Instead, they remain suspended temporarily, creating a heterogeneous mixture or suspension. Over time, the larger particles will settle out of the water due to gravity, a process known as sedimentation. The water may clear at the top as the mud settles to the bottom.
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