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I assume you mean how to write out a chemical reaction. Here is an example: Na+ + Cl- = NaCl For more examples you should refer to any High School level Chemistry textbook. If you mean how does a chem reaction look while you are observing it, lots of things can happen. Color change, light, phase transistions, etc...
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∙ 16y ago
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∙ 13y agoyou can tell if it is a chemical change when a brand new substance can be formed. The properties in a chemical change are flammibility or reactivity. A physical change no new substance is formed.
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∙ 11y agoExample: the thermal decomposition of calcium carbonate
CaCO3 = CaO + CO2
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∙ 11y agoH 0 2 is a [ chemical ] about what you astraphy.
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∙ 12y agoif the thing changes colour or
state.
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∙ 11y agoEvidence of a chemical change includes formation of a precipitate, color change, change in temperature, gas formation, disappearance of a solid, or a new odor.
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∙ 11y agoA chemical change is typically accompanied by one or more of the following; color change, temperature change, formation of a gas, and formation of a precipitate (solid) from two solutions.
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∙ 6y agoThe frying of the bread is a chemical process.
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∙ 12y agoLike color and smell
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Is filtering a chemical change?
No, filtering something is not a chemical change.
Is burning food a physical change?
No. It is a chemical change. By the way, burning something is a chemical change only.
Is flammability of a substance is physical or chemical change?
Stating that something is flammable is stating a chemical property. But the actual burning would be a chemical change.
Are tarnishing and rusting physical or chemical changes?
Something that tarnishes goes through a chemical change versus a physical change.
Is baking soda mixed iodine solution a chemical change?
Chemical, When something changes in color, it is a sign of a chemical change.
Is filtering a chemical change?
No, filtering something is not a chemical change.
Is something that burns easily a physical or chemical change?
If you burn something it is a chemical change, however if you melt of boil it, it is a physical change.
When something new is made it is a chemical or physical change?
Chemical change
Is lighting something a physical or chemical change?
lighting is a chemical change
How can you tell chemical change?
The consequence of a chemical change is the modification of the molecular nature.
Is burning food a physical change?
No. It is a chemical change. By the way, burning something is a chemical change only.
How can you tell there is a chemical reaction when iron rusts?
Because it is not a physical change it is a chemical change.
Is flammable a chemical or a physical change?
Something that burns or is flammable would be a chemical change.
What is the different of physical change to chemical change?
A physical change is one where just the appearance of something changes and a chemical change is where the genetic makeup of something changes.
Is reactivity with vinegar a physical or chemical change?
If something's reacting, it's a chemical change.
Is strontium reacts with water a chemical or physical change?
When something reacts, that is a chemical reaction. Chemical change.
When a kettle is boiled you can tell it is NOT chemical change because?
the change is easily reversed so it is a physical change not a chemical change
