we did a bunsen burner lab where we burned paper clips. We burned it for about 10 seconds then cooled it in water. I know this is a physical change but i need to come up with 3 chemical changes that occured. I already came up with the water vapor that occurs when it cools down and i need two more examples.
Thank you!
Water vapor cooling is a physical change, not a chemical change.
Does combusting gas to CO2 and H2O count as a chemical change although it isn't part of the paper clip.
Did the paper clip change color upon heating? Isn't that a chemical change? What do you think the products were?
To identify three chemical changes that occurred during the bunsen burner lab where paper clips were burned and then cooled, we need to understand the definition of a chemical change. A chemical change, also known as a chemical reaction, involves the formation of new substances with different chemical properties from the original substance(s). Here are two additional examples of chemical changes that likely occurred during the lab:
1. Oxidation: When metal (such as paper clips) is burned, it reacts with oxygen in the air to form an oxide. In this case, the paper clips likely underwent oxidation, transforming into metal oxides. Since this chemical change alters the composition and properties of the paper clips, it is considered a chemical change.
2. Combustion: When the paper clips were burned, a combustion reaction took place. Combustion refers to the rapid reaction of a substance with oxygen, resulting in the release of heat and light energy. The paper clips, being mostly made up of carbon, reacted with oxygen in the air to produce carbon dioxide and water vapor. This reaction is a clear example of a chemical change.
To summarize, in addition to the formation of water vapor upon cooling, the two chemical changes that likely occurred during the bunsen burner lab with paper clips were oxidation of the metal and combustion of the carbon in the paper clips.