1. Which of the following is an example of chemical change when heat is applied?A. Burning of woodB. Cutting clothesC. Freezing of waterD. Sharpening a pencil2. Which is TRUE about chemical change?A. A new product is formed.B. Chemicals change as a result of physical change.C. The product can be changed to its original form.D. A chemical change is more important than any other process.3. What happens when a piece of paper is burned inside a tin can?A. A new material is formed.B. There are no changesC. Both physical changes and chemical changes happen.D. It became ashes and after a few minutes, it turns to its original form.4. What happens to the ice cube, and butter after heat is applied?A. They melt, physical change happens.B. They melt, chemical change happens.C. Nothing happens to the materials.D. All the materials dissolve in the removed air.5. What process is applied in the melting of ice cream, drying of wet clothes, andcooking of vegetables that result in physical and chemical change?A. BoilingB. DryingC. FreezingD. Heating
Answer (1)
1. The question is saying when Heat is applied, B C and D does not have anything to do with Heat so the answer is A. Burning of wood2. Chemical change is when a new product is formed.3.Burning paper produces new substances (like ash, carbon dioxide, and water vapor), so a chemical change has occurred.4. They melt, physical change happens.Melting ice cubes and butter are physical changes because they change from solid to liquid but do not alter their chemical composition.5.Heating can cause both physical changes (like melting and drying) and chemical changes (like cooking, which can involve chemical reactions).
