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A chemical reaction occurs when a chemical change takes place. Meaning that for example, say burning wood is a chemical change. The wood turns into a new substance causing a new properties to form. Like a paper in shreads is a physical change because it is still paper and made from the same state. Sand into glass is a chemical change because it isn't sand anymore of course but was heated and shaped to become a chemical change
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoMany indications can show a chemical change is taking place. Some examples are:
- Warming up (exothermic reaction)
- Cooling down (endothermic reaction)
- Change of colour
- Change of pH
- Gas being given off
- Solutions turning cloudy (turbidity) (or vice versa)
- Change in weight
There are also many other indications, and chemists have lots of tests they use such as:
- Infra-red spectroscopy (IR)
- Nuclear Magnetic Resonance Spectroscopy (NMR)
- Raman Spectroscopy
- Mass-spectrometry
- Chromatography
- Atomic Absorption spectrometry
- X-ray Diffraction (XRD)
These are just a few of many different and varied examples. Many are specific to a certain reaction.
Wiki User
∙ 6y agoSigns of chemical reactions may be: - Gas release - Formation of a precipitate - Change of color - Change of odor - Change of pH - Change of aspect - Change of viscosity - Change of the temperature - Visible formation of new compounds - Change of the state of the matter - A violent reaction with explosion or fire - Bubbling - Emitting a sound - Emitting a light
Wiki User
∙ 14y agoif theres an change in the reavtants and products........
Wiki User
∙ 14y agoit will start foaming
ASHISH RAO
Idoes not know
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Give three things you might see if a chemical reaction takes place?
There are many observations that may occur when a chemical reaction takes place. Some of the things are:- Change of colour, change of temperature change of state. These can be observed by the features below There might be a change in colour when mixing the reactants; the vessel in which the reaction is taking place might get warm on the outside or cold depending on the type of reaction. There may be effervescence or fizzing with gas production; a precipitate may form.
Is burning a pen a chemical change?
A chemical change is when you do something to a material and can never change it back, like when you bake a cake, you might think it's a physical change, but it's actually chemical because you can not change it back to the cake batter. Does that help? ========================== Yes buring a pen is a chemical change.
Is boiling water for soup a physical change or chemical?
this is a tough one but it might be chemical because the steam is a new form of matter
The production of light when two substances are mixed might indicate that?
This is a chemical change.
Why does this indicate that a chemical reaction might have occurred?
Some 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
What indicates that a chemical change might be occurring?
Two solutions are mixed and a solid begins to appear
List three signs that could make you think a chemical reaction might be taking place?
Some signs that a chemical reaction is taking place is color and temperature changes, and the formation of precipitates.
Is heating potassium bicarbonate a chemical or physical change?
The heating itself is a physical change, a chemical change might come from the heating, however.
Is the toasting of bread a physical or chemical change?
This is a physical change and might include a chemical change due to the heat involved in taking the bread to its final appearance. the physical change because, there is a change in color(colour) and a slight change in shape depending on the toaster you are using.
What is the difference between a chemical property and a chemical change?
chemical change-change in the chemicalchemical property-property(physical trait)of the chemicalor something close to that u might want to check...
What is the difference between chemical property and a chemical change?
chemical change-change in the chemicalchemical property-property(physical trait)of the chemicalor something close to that u might want to check...
Give three things you might see if a chemical reaction takes place?
There are many observations that may occur when a chemical reaction takes place. Some of the things are:- Change of colour, change of temperature change of state. These can be observed by the features below There might be a change in colour when mixing the reactants; the vessel in which the reaction is taking place might get warm on the outside or cold depending on the type of reaction. There may be effervescence or fizzing with gas production; a precipitate may form.
Is sound a physical or chemical change?
water boils, it make sound. is that a chemical change??? P.S why use wikianswer?
How might a thermometer help you decide if there was any chemical change on mixing iron and charcoal?
For a chemical change to occur, there must be a chemical reaction. A chemical reaction would be either endothermic (uses energy, mostly heat), or exothermic (produces energy, again mostly heat). Any change in temperature of the reactants, as measured by a thermometer, will tell you not only ifa chemical reaction occurred, but also which kind of chemical reaction. No temperature change usually indicates that no reaction has occurred, a decrease in temperature would indicate an endothermic reaction, while an increase in temperature would indicate an exothermic reaction.
Is burning a pen a chemical change?
A chemical change is when you do something to a material and can never change it back, like when you bake a cake, you might think it's a physical change, but it's actually chemical because you can not change it back to the cake batter. Does that help? ========================== Yes buring a pen is a chemical change.
Is boiling water for soup a physical change or chemical?
this is a tough one but it might be chemical because the steam is a new form of matter
What does a1 mean on a gun?
Indicates a model change from the original. The original might be a Model 1911. When it has a design change, it is now a Model 1911A1.
