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Change in temperature is usually an easy way - most reactions give out or take in a little heat when they occur - very few will have a change too small to measure or too slow evolution of heat to effectively measure. Changes in temperature can however also occur from a physical change such as dissolution of a salt in water. In these cases you're often looking for a change such as a solid material precipitating from a solution, a colour change, evolution of a gas or change in pH. These are common quick and dirty ways to know if a chemical change is likely to have occurred. The absolute ways are to test the reaction afterwards by spectroscopic methods or chromatographic methods and compare these to time zero before reation could have started.
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What sensory evidence could be used to argue that a chemical transformation of a substance had occurred?
Sensory evidence of chemical reactions may be: - Change of color - Change of odor - Change of aspect - Change of the temperature - A violent reaction with explosion or fire - Bubbling - Emitting a sound - Emitting a light
How could one determine whether a sample of aspirin is pure or not?
The determination is by chemical analysis.
How could you prove that grinding a bar of iron into a powder is not a chemical change?
You can prove that isnt a chemical change because it is just a change of appearance which is considered a physical change.
When milk spoils it smell bad is this a physical change or chemical change?
It is a chemical change because you cannot not make the smell go away, if you could it would be a physical change
When you mix a pink powdered substance in water and mix it is that a chemical change?
Mixing is not itself a chemical change. There could be one occurring as a result, but nothing you described indicated any kind of chemical change.
What sensory evidence could be used to argue that a chemical transformation of the substance had occurred?
by a change in smell and appearence of a substance
How could you determine if precipation had occurred?
i don't know
What sensory evidence could be used to argue that a chemical transformation of a substance had occurred?
Sensory evidence of chemical reactions may be: - Change of color - Change of odor - Change of aspect - Change of the temperature - A violent reaction with explosion or fire - Bubbling - Emitting a sound - Emitting a light
Is tarnisha physical change or chemical change?
Well it could either be a physical change OR a chemical change. .
Could the identity stay the same in chemical change?
No. If one substance does not change into another, it is not a chemical change.
Is painting wood a phyical or chemical change?
I guess it could be chemical, but really- it's a physical change
How can you tell that the melting of ice cube is a physical change?
You could test the resulting liquid by determining its boiling point and melting point. If they are the same as the boiling and melting points for water, then it is probably water and a physical change rather than a chemical change has occurred.
How could you determine if a phase change in endothermic?
By a kinetic heat change.
How could you prove to someone that the dissolving was a physical to change not a chemical change?
You could separate it all out.
How could you test whether a chemical or physical reaction occurred?
Signs 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----------------------------------------------------------------During a physical change the molecule composition is not affected.
Can energy be changed into chemical energy durning a chemical change?
Yes it could
What change could happen during a chemical reaction?
the chemical shall be changed
