classify the following into the physical and chemical changes burning of coal photosynthetic in green plants rusting melting of ice
Answers
Answer:
burning of coal is a chemical change. photosynthesis in plants is also a chemical change so is rusting. melting of ice is physical change
Answer:
1.new substances such as carbon dioxide and water form when we are burning coal. Due to formation of new substances, burning coal is classified as a chemical change. ... Since a new substance is created, it is a chemical reaction
2.water and carbon dioxide combine to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.
3.The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide
4.When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice