Yes, water is transparent, allowing light to pass through easily. It can be made opaque by adding substances like milk, mud or paint, which scatter light and prevent visibility through the liquid.
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Recyclers check materials for type (paper, glass, metal, plastic), cleanliness, and separability. They avoid buying contaminated or mixed materials, as these complicate recycling processes and reduce the value of the recyclable materials.
Soluble pairs: vinegar and glucose, water and glucose. Insoluble pairs: mustard oil and water, honey and wheat flour. Glucose dissolves in vinegar and water, while mustard oil and honey do not dissolve in the others.
Glass is used for windows, bottles, and decorative items due to its transparency and smooth surface. It is also resistant to water and chemicals, making it suitable for laboratory equipment.
Materials are selected based on their properties, such as strength, flexibility, or durability. For example, metal is chosen for tools due to its strength, while plastic is used for containers because it is lightweight.