Worksheet Science Process Skill | PDF - Free Printable

Problem Analysis and Solution Explanation

The task provided involves a series of steps to separate salt, sand, and water from a mixture. Below is a detailed explanation of the solution, analysis, conclusions, applications, and reflections.

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#### Steps
1. Mix 5 grams salt and 5 grams sand with 50 mL of water in a 250 mL beaker. Stir gently.
- Explanation: Salt (sodium chloride) is soluble in water, meaning it will dissolve when mixed with water. Sand, being an insoluble solid, will remain undissolved.
- Purpose: This step creates a heterogeneous mixture containing dissolved salt (in water), undissolved sand, and water.

2. Filter the mixture into a conical flask using funnel and filter paper.
- Explanation: Filtration is used to separate solids (sand) from liquids (water + dissolved salt). The sand particles are retained on the filter paper, while the liquid (water + dissolved salt) passes through.
- Purpose: This step separates the sand from the water-salt mixture.

3. Pour the filtrate into an evaporating dish, heat the salt solution gently until it starts to "rust."
- Explanation: Evaporation is used to remove the water from the salt solution. As the water evaporates, the concentration of salt increases, and eventually, the salt begins to crystallize (form crystals).
- Purpose: This step separates the salt from the water, leaving behind solid salt crystals.

4. Turn off the spirit burner and let the salt dry.
- Explanation: After evaporation, the remaining solid is pure salt. Allowing it to cool and dry ensures that no moisture remains.
- Purpose: This step ensures the final product (salt) is dry and pure.

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#### Analysis
1. The smaller particle, that is salt, mix with the bigger particle, sand.
- Explanation: Salt particles are much smaller than sand particles. When mixed, they coexist in the same mixture but can be separated using physical methods like filtration and evaporation.

2. When all the mixture is filtered, the compound left in the filter paper is sand; this process is called filtration.
- Explanation: Filtration separates solids (sand) from liquids (water + dissolved salt). The sand, being insoluble, remains on the filter paper.

3. To evaporate the mixture using an evaporating dish.
- Explanation: Evaporation removes the liquid component (water) from the solution, leaving the dissolved salt behind as crystals.

4. Heating process is used to remove the water particle and the precipitate left is salt compound. This process is called evaporation.
- Explanation: Heating accelerates the evaporation of water, leaving behind the solid salt. This is a common method for separating soluble solids from liquids.

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#### Conclusion
1. To separate the sand compound from salt and sand water mixture using filtration process.
- Explanation: Filtration effectively separates undissolved solids (sand) from the liquid mixture (water + dissolved salt).

2. To separate the salt compound from salt, sand, and water mixture using evaporation process.
- Explanation: Evaporation removes the liquid (water) from the solution, leaving behind the dissolved salt as a solid.

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#### Application of the Idea
1. This experiment can be applied for salt farmer, when they produce salt from sea water that still consist a lot of sands. Then they need to evaporate the mixture.
- Explanation: Salt farmers use natural sunlight or artificial heating to evaporate seawater, leaving behind salt crystals. The presence of sand can be removed using filtration before or after the evaporation process.

2. The filtration process can be used in water purifying process.
- Explanation: Filtration is a crucial step in water purification, where it removes suspended solids, debris, and other impurities from water.

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#### Reflection
1. Find the other application in real life about evaporation and filtration processes.
- Example: In the production of sugar, molasses (a thick, syrupy liquid) is filtered to remove impurities, and then the liquid is evaporated to crystallize sugar.

2. Discussing the other process that used to separating mixture.
- Other Processes:
- Distillation: Used to separate components of a liquid mixture based on their boiling points. For example, distilling alcohol from fermented solutions.
- Chromatography: Used to separate mixtures based on the interaction between components and a stationary phase. Commonly used in laboratories for analyzing complex mixtures.
- Magnetic Separation: Used to separate magnetic materials from non-magnetic ones. For example, separating iron filings from sand.

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Final Answer

- Steps: Mix, filter, evaporate, and dry.
- Analysis: Filtration separates sand, and evaporation separates salt.
- Conclusion: Use filtration for sand and evaporation for salt.
- Application: Salt farming and water purification.
- Reflection: Other applications include sugar production and chromatography.

Boxed Final Answer:
$$
\boxed{\text{The process separates sand by filtration and salt by evaporation, with applications in salt farming and water purification.}}
$$