Topic Breakdown of WASSCE - Integrated Science Exam

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WASSCE - Integrated Science Sample Test

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A cup of warm saltwater is added to a teaspoon of clean, dry sand. What is most likely to happen after the mixture is stirred and then allowed to sit for five minutes?

Correct Answer:

the sand will settle to the bottom

when a cup of warm saltwater is added to a teaspoon of clean, dry sand and the mixture is stirred, then allowed to sit for five minutes, the most likely outcome is that the sand will settle to the bottom of the cup. this happens due to the physical properties of sand and how they interact with water.

sand particles are generally larger and denser than water molecules, and they are insoluble in water. when sand is mixed with water, it remains distinct from the water because it does not dissolve. once stirring ceases, gravity pulls the heavier sand particles downward, causing them to settle at the bottom of the container. this settling process is a straightforward physical change, not a chemical reaction. the structure and chemical composition of the sand and the saltwater remain unchanged.

furthermore, the presence of salt in the water does not alter this expected behavior significantly. salt (sodium chloride) dissolves in water, creating a saline solution, but it has no effect on the sand's insolubility. the salt remains dissolved in the water even after the sand has settled. the overall volume and appearance of the water do not change noticeably just because it contains dissolved salt and sand at the bottom.

thus, the correct answer to what happens when a cup of warm saltwater is mixed with sand is that the sand will settle to the bottom after the mixture is allowed to sit for a while. this outcome does not involve any increase in the amount of water, nor does it cause the salt to float to the top or the temperature of the mixture to change from its initial state post-mixing.