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well the way i learned it, if you cannot bring something back to its original state its a chemical change. if you can, then its a physical change.
For example-
burning paper is a chemical change because you cannot bring that piece of paper back from the ashes.
wrinkling paper is a physical change because you can unwrinkle the paper and bring it back to its original state.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoThe following can indicate that a chemical change has taken place:
- Change of odor.
- Change of color.
- Change in temperature or energy, such as the production or loss of heat.
- Light, heat, or sound is given off.
- Formation of precipitate.
Wiki User
∙ 9y agoWiki User
∙ 10y agoIndications of a chemical change include the formation of a precipitate, the formation of a gas, change in color, change in temperature, change in odor, and disappearance of a solid.
Wiki User
∙ 11y agoThe substance changed shape
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Even if you change the shape and amount of a substance it's stays the same?
By changing the size, shape, or amount of a given substance, a physical change is being exerted. A physical change is a change in which the molecular structure of the substance remains the same. For a substance to be considered "changed", a chemical reaction must take place resulting in a reconfiguration of molecules. For example, with enough heat, wood undergoes a chemical reaction, converting it to carbon. Chipping a log with a hatchet, on the other hand, would entail a physical change.
What is meant by chemical change?
Chemical ChangesAs opposed to a physical change, chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change. Signs that a reaction is taking place: Formation of gases (bubbles), Color change, production of heat or light, and the formation of a solid. a change in composition and characteristics of matter.new substance maybe formed.original substance and form may be lost.new color and shapeExamplesFermentationPhotosynthesisRusting nailSpoiling milkDigesting food
Is adding HCl to Mg physical change?
No. There is a change in substance taking place, so it would be considered a chemical change.
What happens when a compound undergoes a chemical reaction?
When a compound undergoes a chemical reaction, it is forever altered. It can never go back to the way it was before the reaction took place.
Is shoveling snow a chemical or phyiscal change?
If you have to classify it, it is physical as no new substance is made. You are just moving it from one place to another.
What take place when a substance undergoes a chemical change?
an explosion (fact)
What is the definition chemical change?
Chemical ChangesAs opposed to a physical change, chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change. Signs that a reaction is taking place: Formation of gases (bubbles), Color change, production of heat or light, and the formation of a solid. a change in composition and characteristics of matter.new substance maybe formed.original substance and form may be lost.new color and shapeExamplesFermentationPhotosynthesisRusting nailSpoiling milkDigesting food
Explain how wood burning in a fire place undergoes a chemical change?
Burning is an oxydation reaction so a chemical change.
When a chemical change is in place does no new substance form?
No, a new substance is normally formed
Even if you change the shape and amount of a substance it's stays the same?
By changing the size, shape, or amount of a given substance, a physical change is being exerted. A physical change is a change in which the molecular structure of the substance remains the same. For a substance to be considered "changed", a chemical reaction must take place resulting in a reconfiguration of molecules. For example, with enough heat, wood undergoes a chemical reaction, converting it to carbon. Chipping a log with a hatchet, on the other hand, would entail a physical change.
When a change makes a new substance you say a - has taken place?
A chemical reaction makes a new substance.
How does matter chemically change?
The chemical changes take place on moleculer space. A chemical change form (or) produce a new substance.
Why is a phase change a physical change and NOT a chemical change?
Because no chemical reaction is taking place. It is the same substance, just in a different state of matter.
What does a substance changed into when chemical change take place?
The reactants are changed in products having new chemical composition.
What is meant by chemical change?
Chemical ChangesAs opposed to a physical change, chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change. Signs that a reaction is taking place: Formation of gases (bubbles), Color change, production of heat or light, and the formation of a solid. a change in composition and characteristics of matter.new substance maybe formed.original substance and form may be lost.new color and shapeExamplesFermentationPhotosynthesisRusting nailSpoiling milkDigesting food
Is adding HCl to Mg physical change?
No. There is a change in substance taking place, so it would be considered a chemical change.
Write 3 differences between chemical and physical change?
Okay now here goes in a physical change no chemical reaction takes place. in chemical change chemical reactions take place. A physical change is reversible but a chemical change is not.In a physical change no new substance is formed(A+B=B) in a chemical change new substances are formed(A+B=C)
