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Because it is not a physical change it is a chemical change.
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∙ 12y ago
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Why is a nail rusting a chemical change?
Yes, because the chemical reaction of rust is next to impossible to get the iron, water and oxygen back from the iron oxide it creates by rusting, and its like baking a cake is a chemical reaction, once the cake is a cake you can't get the eggs or sugar back. The rust also makes the nails weak and flimsy, this is why we shouldn't use nails if they are rusted, especially large structures. A way you can tell its a chemical reaction is that the color changes and the appearance changes.
What will tell you the efficiency of a chemical reaction?
You need to calculate the yield of the reaction.
What does a positive delta H tell about reaction?
This is an endothermic chemical reaction.
How can you tell the difference between a chemical reaction and not a chemical reaction?
A chemical reaction will do the following; Change colour Create smoke A non chemical reaction (Physical Reaction) will do the following; Change State Be able to change back to the original materials
What can chemical equations tell you about a chemical reactions?
Chemical equations describe the products and reactants in a chemical reaction.
How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
For a chemical change to occur, there must be a chemical reaction. A chemical reaction would be either endothermic (uses energy, mostly heat), or exothermic (produces energy, again mostly heat). Any change in temperature of the reactants, as measured by a thermometer, will tell you not only ifa chemical reaction occurred, but also which kind of chemical reaction. No temperature change usually indicates that no reaction has occurred, a decrease in temperature would indicate an endothermic reaction, while an increase in temperature would indicate an exothermic reaction.
What does the potential energy diagram of a chemical reaction tell you?
Whether the reaction is endothermic or exothermic
Chemical properties tell you how something?
Chemical properties tell you how the element or compound is going to react during a chemical reaction.
How can you tell when a chemical has reacted?
When there is a change in its chemical/physical properties. A chemical reaction involves the changing of the object's chemical make up.
What are the energy transfers in the iron and sulfur reaction?
i dont know u tell me
How can you tell fools gold from gold by using a chemical reaction?
With magnets.
How can you tell a chemical reaction is losing heat?
The apparatus becomes hot.
