0
What are 5 ways to know that a chemical reaction has taken place?
Wiki User
∙ 10y ago
5 different ways include in order of simplicity:
1. observation, such as colour change, heat liberated/taken in, precipitation etc.
2. TLC the reaction mixture. This should show at least 1 band that is not any of the starting materials/catalyst if present
3. IR spectroscopy. i.e. if you have a metal carbonyl and expect carbonyl loss, the amount of signals seen in the 1850-2100cm^-1 region should decrease (relative to its symmetry)
4. UV spectroscopy. An easy technique, not so easy to interpret, especially with q=starting materials present.
5. NMR spectroscopy. Hydrogen especially, and Carbon 13, can give a serious wealth of information on what you have in a sample that contains hydrogen and carbon.
Another one is LCMS. This gives very good, unambiguous info and can be used with crudes.Wiki User
∙ 10y ago
Wiki User
∙ 12y ago- Gas Formation
- Precipitate
- Color Change
- Sound
- Odor
Wiki User
∙ 12y ago1) Color Change
2) Formation of Gas
3) Formation of Precipitate
4) Energy Released/Absorbed
5) Odor Detected
Wiki User
∙ 12y agoWhen you see a tweaker in a 24hr Walmart at 3 in the morning with a flashlight on there head, a chemical reaction has taken place
Wiki User
∙ 8y agoA change in the color, physical state,temperature or odor may occur. A precipitate can be seen sometimes.
Wiki User
∙ 8y agoChange in color, precipitate, gas formation, change in temperature, changed in pH
Add your answer:
Earn +20 pts
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.
