Write a paragraph answering the questions and use your knowledge about evidence of a chemical change and physical change. What are different examples of chemical changes that occur in the world around us? Can physical and chemical changes occur at the same time? Provide an example explaining your thinking. Draw a conclusion and make a claim. What do these reactions say about substances and chemical reactions that would hold true in most cases?
Use evidence to support your analysis and conclusion.
Explain your analysis and conclusion. make a new one
There are numerous examples of chemical changes that occur in the world around us. One common example is the process of combustion, where a substance reacts with oxygen to produce heat and light. This can be observed when a candle is lit and the wax melts and burns. Another example is rusting, where iron reacts with oxygen and moisture in the air to form iron oxide. This can be seen when a metal object is left exposed to the elements for a long period of time and develops a reddish-brown layer.
Physical and chemical changes can occur simultaneously. One example of this is cooking food. When meat is cooked, it undergoes both physical and chemical changes. The physical change involves heat being applied to the meat, causing its proteins to denature and change texture. The chemical change occurs when the proteins in the meat undergo a reaction called the Maillard reaction, resulting in the browning and development of new flavors.
Based on these reactions, it can be concluded that substances have the ability to undergo both physical and chemical changes. This shows that substances can have different properties and characteristics depending on the conditions they are exposed to. Chemical reactions, in particular, can result in the formation of new substances with different properties than the original substances. However, it is important to note that not all substances will undergo chemical reactions under all conditions, and some substances may only undergo physical changes.