Which of the following statements explain why hot soapy water is more effective in cleaning oil-stained dishes?

Assessment: WAEC SSCE - Physics - 2020 (Objective) Subject: Physics

Question 1 Report

Which of the following statements explain why hot soapy water is more effective in cleaning oil-stained dishes?

 
 

Answer Details
The statement that explains why hot soapy water is more effective in cleaning oil-stained dishes is that "soap and heat decrease the surface tension of oil." When oil gets stuck on dishes, it forms a layer on top of the surface, making it difficult for water to penetrate and remove it. However, soap molecules are designed to break down the surface tension of oil, allowing water to mix with it and wash it away. The addition of heat to the soapy water further helps to reduce the surface tension of the oil, making it easier to clean. Therefore, using hot soapy water is more effective in cleaning oil-stained dishes.
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