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What are two ways you know a chemical reaction has taken place?
Wiki User
∙ 10y ago
An unexpected color change: Ex: two clear liquids forming a red liquid
Formation of a precipitate: A formation of a solid after the reaction (if you are mixing two liquids and the liquid after mixing the originals is cloudy, than a precipitate has formed)
Temperature change: there are two possible temperature changes: exothermic (feels hot after reaction) and endothermic (feels cold after reaction)
Formation of a gas: (mixture begins to bubble)
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoThere are more than two signs of a chemical change. They are: change in temperature, color change, formation of a precipitate, formation of a gas, formation of a new odor, disappearance of a solid.
Wiki User
∙ 10y agoSome indicators of a chemical reaction are:
- change of color
- change of odor
- release of a gas
- change of the temperature
- change of the viscosity
- formation of a precipitate
- change of general appearance
- possible explosion
- possible chemiluminiscence
- formation of new compounds
Wiki User
∙ 12y agoIf the reaction is giving off heat (that is noticeable through steam or can be felt/measure by thermometer) or if it is changing color.
Wiki User
∙ 13y agocolor change or gas evolution
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When you burn magnesium in air what might show you a chemical reaction has taken place?
I don't know how you know afterwards but when you burn magnesium in air it burns this really bright white light.
An amtom undergoes a reaction ant attains a more stable from how do you know is it was chemical or nuclear reaction?
If an atom undergoes a reaction and attains a more stable form, you know if the reaction was a chemical reaction or a nuclear reaction by studying what exactly happened to the atom.
What kind of changes has taken place when you sharpen a pencil how do you know?
It is a physical procedure because the chemical composition remain unchanged.
When hydrochloric acid is mixed with calcium is that a chemical or a physical reaction?
chemical how do you know?
Is picking up iron filings with a magnet a chemical reaction?
No, a chemical reaction is when the atoms are not mixed together but chemical bonded together. You know when a chemical reaction has happened when you can smell, hear or see things reacting.
What are 3 ways you know a chemical change has taken place?
Three signs of a chemical reaction include the release or absorption of heat, a change in color, and the creation of a gas or a precipitate.
When you burn magnesium in air what might show you a chemical reaction has taken place?
I don't know how you know afterwards but when you burn magnesium in air it burns this really bright white light.
Is Reactants are substances that exist after the reaction has taken place?
see i dont know
How do you know when a chemical change has taken place when a firework goes off?
youwill hear it
How do you know when an endothermic reaction has taken place?
When something melts, boils, evaporates or sets fire.
How many types of chemical reactions are there?
normally there are a few chemical reactions the ones that i know of arecolour changeheat changefizzingbubblingthose are all i can remember sorryActually these aren't types of reactions. These are physical signs that a chemical reaction has taken place.
Is paint bubbling a chemical reaction?
yes ............... paint bubbling is a chemical reaction. when anything bubbles you know there is a chemical reaction.
How can you tell if chemical reaction has taken place in a parachute?
well you see that depends on how much you payed for your parachute some will have a small reaction and turn green but if you pay far more money you can get one in with the reaction is this Pb2Cl+Na2SO4---> PbSO4+NaCl you will know this has happend if you now have a lead block and some salt
An amtom undergoes a reaction ant attains a more stable from how do you know is it was chemical or nuclear reaction?
If an atom undergoes a reaction and attains a more stable form, you know if the reaction was a chemical reaction or a nuclear reaction by studying what exactly happened to the atom.
What kind of changes has taken place when you sharpen a pencil how do you know?
It is a physical procedure because the chemical composition remain unchanged.
When hydrochloric acid is mixed with calcium is that a chemical or a physical reaction?
chemical how do you know?
Is picking up iron filings with a magnet a chemical reaction?
No, a chemical reaction is when the atoms are not mixed together but chemical bonded together. You know when a chemical reaction has happened when you can smell, hear or see things reacting.
