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It is not so hard.
Some indicators of a chemical reaction are:
- formation of new compounds - change of color
- change of odor
- release of a gas
- change of the temperature (absorption or release)
- change of the viscosity
- formation of a precipitate
- change of general appearance
- possible explosion - sometimes a sound is produced - possible chemiluminescence
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Is hard ketchup a physical or chemical change?
physical
What is the most important quiestion to ask to determine whether a change is physical or chemical?
Did the composition change
Is hard boiling an egg physical or chemical?
It is changing from a liquid to a solid so it is chemical change.
Because change the identity of the substances involved they are hard to reverse?
ChemicalBecause CHEMICAL change the identity of the substances involved they are hard to reverse.
What is the difference between physical and chemical changes of matter?
Usually a physical change can be reversed such as fruit rotting. where as chemical change is very hard to reverse such as rust
What methods do scientist use to determine if it is a physical or chemical change?
For a chemical change they analyze the new substances to prove there has been a change in the chemical composition. I am not sure about physical though.
What 4 factors determine a chemical change?
heating is one of them
What is the most important question to ask determine whether a change is a physical or chemical change?
did the composition change
Is a boiling egg a physical change?
No, hard-boiling an egg is a chemical change. By cooking the egg you change its chemical composition.
Is a given change a chemical or a physical change?
It depends. Physical can be easily reversed. Chemical is hard, if not impossible to reverse.
Is hard ketchup a physical or chemical change?
physical
What is the most important quiestion to ask to determine whether a change is physical or chemical?
Did the composition change
Boiling an egg is a chemical or physical change?
it is a physical change because it would be hard to revers
What are the factors which determine a chemical change?
Change in colour, mass and state(ie liquid, gas or solid)
When water and concrete mix are combined the material becomes warm and a hard solid forms so Is this a physical change or a chemical change?
This is a chemical process: a hydration reaction occur.
Is hard boiling an egg physical or chemical?
It is changing from a liquid to a solid so it is chemical change.
Because change the identity of the substances involved they are hard to reverse?
ChemicalBecause CHEMICAL change the identity of the substances involved they are hard to reverse.
