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You might observe a change in color, gas bubbles being formed, a change in temperature (this might require the use of a thermometer, unless the solution actually boils), or you can test for a specific chemical by using an indicator, or analyse the solution by means of a mass spectrometer. Explosions are also a very convincing form of evidence that a chemical change has taken place.
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What evidence is there to show that a chemical reaction has taken place when an egg is cooked?
The change in color indicates that a chemical reaction has taken place.
Is burning newspaper a physical change?
Yes, burning newspaper is a chemical change because it undergoes a chemical reaction (combustion) that changes its chemical composition. The heat and flame produced during burning are evidence of this chemical reaction taking place.
What sensory evidence could be used to argue that a chemical transformation of a substance had occurred?
Sensory evidence such as changes in color, odor, taste, texture, or form of the substance could be used to argue that a chemical transformation has occurred. For example, a substance turning from clear to cloudy, emitting a new smell, or forming bubbles could indicate a chemical change has taken place.
Is fizzing a chemical change?
Yes, fizzing is typically associated with a chemical change. It often occurs when a chemical reaction produces gas bubbles, such as in the case of an antacid tablet reacting with stomach acid to release carbon dioxide gas.
How is a precipitate evidence for a chemical reaction?
A precipitate forms when two aqueous solutions react to produce an insoluble solid. The formation of a precipitate indicates that a chemical reaction has occurred, as the reactants have undergone a change in chemical composition to produce a new substance with different physical properties. This is observable evidence of a chemical change taking place.
What changes gives NO evidence that a chemical reaction has taken place?
Changes such as a change in state (solid to liquid), change in color, change in odor, change in solubility, or change in temperature do not provide direct evidence that a chemical reaction has occurred. These changes can be indicative of a physical change rather than a chemical change. To confirm a chemical reaction, additional evidence such as the formation of new substances, evolution of gas, or consumption of reactants is necessary.
What evidence is there to show that a chemical reaction has taken place when an egg is cooked?
The change in color indicates that a chemical reaction has taken place.
Is combustion a chemcial change?
Combustion clearly is a chemical change. In the combustion of a hydrocarbon, for example, you begin with the hydrocarbon and after combustion you end up with carbon dioxide (CO2) and water (H2O). This demonstrates that a chemical change has taken place.
What form of evidence do you need to show that a chemical reaction has taken place?
You must video tape it and make sure the final result is either a physical change or a chemical change.
Is burning newspaper a physical change?
Yes, burning newspaper is a chemical change because it undergoes a chemical reaction (combustion) that changes its chemical composition. The heat and flame produced during burning are evidence of this chemical reaction taking place.
What evidence indicates that a chemical change took place when the iron and sulfur combined to form iron sulfide?
Evidence of a chemical change between iron and sulfur to form iron sulfide includes color change (from grey to black), formation of a new substance with different properties, and the release of heat energy during the reaction. Additionally, chemical analysis showing the presence of iron and sulfur atoms in the product confirms a chemical transformation has taken place.
If you are trying to decide whether a chemical reaction does or does not take place when two substances are mixed what kind of evidence will you look for?
To determine if a chemical reaction takes place when two substances are mixed, you can look for evidence such as color change, formation of precipitate, gas production, change in temperature, and the evolution of light or sound. These observable changes indicate a chemical transformation has occurred.
What sensory evidence could be used to argue that a chemical transformation of a substance had occurred?
Sensory evidence such as changes in color, odor, taste, texture, or form of the substance could be used to argue that a chemical transformation has occurred. For example, a substance turning from clear to cloudy, emitting a new smell, or forming bubbles could indicate a chemical change has taken place.
Is fizzing a chemical change?
Yes, fizzing is typically associated with a chemical change. It often occurs when a chemical reaction produces gas bubbles, such as in the case of an antacid tablet reacting with stomach acid to release carbon dioxide gas.
How is a precipitate evidence for a chemical reaction?
A precipitate forms when two aqueous solutions react to produce an insoluble solid. The formation of a precipitate indicates that a chemical reaction has occurred, as the reactants have undergone a change in chemical composition to produce a new substance with different physical properties. This is observable evidence of a chemical change taking place.
How can you be sure that at least one chemical change has occurred?
You can be sure that a chemical change has occurred if there is a change in color, formation of a precipitate, evolution of gas, or absorption/release of heat during the reaction. These are all indicative of a chemical reaction where the substances are transformed into different compounds with new chemical properties.
If a piece of metal bubbles was place in acid is that a chemical change?
No, it is not a chemical change. For example, if you put gold bubbles into any single acid, no chemical change will take place.
