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What are the four occurrences indicate a chemical reaction has occurred?
Wiki User
∙ 11y ago
A chemical reaction can result in any or all of the following:
- a change in temperature (up or down)
- a change in color
- a smell that wasn't there before
- the formation of bubbles (indicating the production of a gas)
- the formation of a precipitate
Wiki User
∙ 11y ago
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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.
Pretend you've done a science experiment showing the results of a chemical reaction what video clips would be best to add to your report?
A video showing the reaction as it occurred
What chemical reaction occurred copper sulfate pentahydrate when heated?
The chemical decomposition is:CuSO4------ CuO + SO3
Is a rusty penny an example of a chemical reaction true or false?
Yes. The rust on the penny indicates that a reaction between the penny and its environment has occurred. Since a new material was formed from this reaction (the rust) the reaction must be a chemical reaction.
What evidence is there that a chemical reaction has occurred in an automobile?
Yes there is a chemial reaction,when gas is compressed by piston temperature increases so it cathes the fire.
What symbols indicate that a chemical reaction has occurred?
The sign equql + or an arrow to right.
Why does a change in body temperature indicate that a chemical reaction may have occurred?
Because a disease involve frequently chemical reactions in the organism.
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.
How does a chemical equation show that a chemical reaction has occurred?
A chemical equation shows that chemical reaction has occurred as new substances have been formed from the reagents. A chemical equation has two sides before reaction and after reaction, if there is any change from the before reaction side to the after reaction side, it indicates that a chemical reaction has just occurred.
What is present after a chemical reaction?
That depends on the chemicals present before the chemical reaction and sometimes the conditions under which the chemical reaction occurred.
If the chemical properties of the substance have not changed has a chemical reaction occurred?
It depends: just try to relate, try to write a chemical equation for and see if there are byproducts. Most likely, if the same chemical still has its same properties After the reaction, a chemical reaction has not occurred.
A chemical reaction has not occurred if the products have?
The same chemical properties as the reactants.
How does the chemical equation show that a chemical reaction occurred?
When a compound produces.
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 should not be used to indicate a chemical reaction?
Change of shape can not be used to indicate a chemical reaction has happened. Examples of evidence of a chemical reaction are changes in odor or color.
What in general terms does a chemical equation indicate?
A chemical equation is the representation of a chemical reaction.
Is a soluble aspirin fizzing in water a chemical reaction?
Yes. If there is the appearance of a gas (fizzing), then a chemical reaction has occurred.
