Why is boiling not considered a chemical change?Īnswer and Explanation: Boiling water is not a chemical reaction because in order for a chemical reaction to occur, reactants must combine and their molecules must rearrange to form a new product. It’s an example of a chemical change because the composition of the egg is changing. Is cooking an egg an example of a physical change or chemical change? Explain your answer. Which of the following is a chemical change cooking an egg? The heat coming from your stove denatures the protein by disrupting some of its bonds that held the molecule into shape. Chemically, this is the process by which the chains of amino acids are changed from their original (or native) state. What chemical reaction happens when you cook an egg?ĭenaturation is what happens when heat is applied to the eggs. Is boiling water a chemical change or physical change?ĭuring boiling, water changes from liquid to gaseous state. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut! Why is boiling water a physical change?īoiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water. Some, but not all physical changes can be reversed. Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending. Freezing and boiling are considered to be examples of chemical reactions. Research shows that students frequently use the term chemical change to describe changes in physical state. Hence, boiling of an egg is a chemical change. The properties of a boiled egg are totally different from the raw egg. When egg is boiled, chemical nature of the egg changes. Why is boiling of egg a chemical change and boiling of water is physical change?īoiling of egg is chemical change: 1. The most clear ways this happens with eggs are when they’re fried for something like egg fried rice. This is because when cooked, the heat denatures the proteins which changes their properties and composition. Is an egg physical or chemical change?Ĭooking an egg is a chemical change. Examples of physical changes are boiling, melting, freezing, and shredding. Examples of chemical changes are burning, cooking, rusting, and rotting. 24 Why are chemical changes brought by heat like the cooked egg are irreversible? Is boiling food a physical change?Ī chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
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