SECONDARY 1 SCIENCE | SEPARATION TECHNIQUES

Recent questions

• How does magnetic attraction work in separation techniques?

  Magnetic attraction involves attracting magnetic substances like iron and steel to magnets, while non-magnetic materials like glass and plastic are not affected. This technique is used to separate magnetic substances from non-magnetic ones by simply using a magnet. For example, in a scrapyard, magnetic attraction is utilized to separate magnetic materials from non-magnetic ones, saving time and effort in the process. The key is to ensure that the target substance is magnetic, while the rest are non-magnetic, allowing for effective separation.

• What is the process of evaporation in separation methods?

  Evaporation is a separation technique where a solute and solvent can be separated by changing the solvent from liquid to gas. An example of this is separating salt from saltwater by evaporating the water, leaving behind the salt. Additionally, evaporation is used to preserve food by removing moisture, which helps prevent bacterial growth. This process is crucial in various industries and everyday applications for separating substances based on their physical properties.

• How does filtration work as a separation technique?

  Filtration is a separation technique used to separate substances that are insoluble in water by using a filter paper. This method is effective for separating solid particles from liquids, as the liquid passes through the filter paper while the solid particles are retained. Filtration is commonly used in laboratories, industrial processes, and even in everyday tasks like making coffee. It is a simple yet efficient way to separate substances based on their solubility and physical properties.

• What is the significance of Ink Spot in separation methods?

  Ink Spot, a technique used in paper chromatography, creates various colors like yellow, pink, orange, blue, and purple, each representing a pure substance forming a single dot when the water rises on paper. This method is crucial for identifying and separating different substances based on their solubility in water. By using different inks with varying solubility, Ink Spot allows for the effective separation and analysis of substances, making it a valuable tool in scientific research and analysis.

• How is water utilized in Singapore for various purposes?

  Water in Singapore serves four main purposes: it is essential for living organisms, used in industrial processes, for household activities like cooking and cleaning, and for recreational activities such as swimming and canoeing. The water in Singapore is sourced from local catchments, imported from Johor under a 1962 agreement, produced as new water through advanced filtration processes, and obtained as desalinated water using distillation or reverse osmosis. These different methods of obtaining water highlight the importance of efficient separation techniques in ensuring a sustainable and reliable water supply for various needs in Singapore.