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What is the only sure way to prove that a chemical reaction has occurred?
Wiki User
∙ 11y ago
Signs of chemical reactions may be:
- Gas was formed
- Formation of a precipitate and water
- Reactants disappeared
- products were made
- energy is released
- properties of reactant and products are different
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoThe only way to be sure a chemical reaction or change has occurred is to test the composition of a sample before and after a change.
Wiki User
∙ 11y agothe products are different from the reactants
Wiki User
∙ 12y agothy chemical
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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.
What is the reaction when copper II nitrate is put into water?
This is not a chemical reaction; it is only a dissolution.
What is created and what is destroyed during a chemical reaction?
starting substances and substances called products
What is the only way to separate a compound into its element?
chemical reaction
Does energy decrease or increase during a chemical reaction?
Energy is only made not taken away. But during a chemical reaction, it depends on what kind of chemicals you put in there.
What is the only sure evidence for a chemical reaction?
The only way to be sure a chemical reaction or change has occurred is to test the composition of a sample before and after a change.
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 substance melts proof that a chemical change has occurred?
no unless there is a chemical change but there isn't. only a physical change has occurred
Where is the mass to a chemical reaction found?
A hemical reaction has no mass; only chemical compounds have molar mass.
Why a catalyst is not involved chemically in chemical reaction?
The catalyst is not a reactant; a catalyst only favors a chemical reaction, the reaction rate and yield.
Is sawing a log chemical reaction?
No, that would probably be considered a physical change. It is only a chemical reaction its chemical makeup is changed.
Are chemical reactions a chemical change of original substances before a chemical reaction takes a place?
Substances are changed only after the beginning of a chemical reaction.
What effect does a catalyst have?
a catalyst has no effect in chemical reaction. it only increases or decreases the rate of the chemical reaction.
Is love only a chemical reaction?
yes and no.
How do you prove that sand has salt particles?
Only after chemical analysis.
Which sub-atomic particle creates chemical reaction?
Proton and Neutron do not take part in chemical reaction. Only electron takes part in the reaction.
What historical antecedent to consumer protection occurred in the 1950s?
a significant breakthrough occurred with the establishment of the product-liability concept, whereby a plaintiff did not have to prove negligence but only had to prove that a defective product caused an injury
