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.
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There are lots of changes that happen around us that involve chemicals. One example is when things burn, like a candle. When you light a candle, the wax melts and burns, giving off heat and light. Another example is when things get rusty, like metal. If you leave metal outside for a long time, it can react with the air and water to make a reddish-brown layer called rust.
Sometimes, both physical and chemical changes can happen at the same time. A good example is when you cook food, like meat. When you cook meat, it gets hot and changes how it feels or looks, which is a physical change. But it also goes through a chemical change called the Maillard reaction. This reaction makes the meat brown and gives it new flavors.
These examples show that substances can change in different ways. Sometimes, they can look or feel different, and sometimes they can make entirely new things with different properties. But not every substance will react with other things, and some changes can just be physical.