| (1) stainless steel ,plastic (2) vinegar |
| (1) the use of metal materials refers to the metal element or metal element-based composition of materials with metal properties of the collective name, as well as the range of organic polymer materials to solve . (2) Because the main component of limescale is calcium carbonate, you can use vinegar to react with it to get rid of it. (1) Because the metal material is a general term with metal properties, so stainless steel should be metal materials, and plastics and other organic polymer materials. The answer is: stainless steel; plastic. (2) the use of carbonates can react with acid to produce carbon dioxide knowledge, the use of vinegar can remove the bottle liner in the scale. The answer is: vinegar. Comments: This question is a life of chemical knowledge assessment questions, the key to solving the problem is to be able to use the knowledge learned in the study of chemistry and life in the combination of practical problems, is the basic knowledge of the assessment questions. |