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What evidence of a chemical reaction might you see dropping an alka-seltzer tablet into a glass of water?
You might observe fizzing or bubbling as the tablet dissolves in the water due to the release of carbon dioxide gas. This effervescent reaction is evidence of a chemical reaction occurring between the ingredients in the tablet and water.
What evidence do you have that a chemical reaction took place?
Evidence of a chemical reaction includes the formation of a new substance with different properties, changes in color, the release of gas or heat, or the formation of a precipitate. Additionally, changes in mass due to the rearrangement of atoms in the reactants can also indicate a chemical reaction has occurred.
If one substance changes color is it a chemical reaction?
Not necessarily. Things sometimes change colors during a chemical reaction, but a color change is not sufficient evidence of a chemical reaction. You can add drink mix to water and the water turns colors, but it is not a chemical reaction, just a mixture.
What is the evidence that a chemical reaction took place when zinc mixed with HCl?
Evidence that a chemical reaction took place when zinc mixed with HCl includes the production of hydrogen gas bubbles, formation of zinc chloride as a product, and an increase in temperature of the reaction mixture due to the exothermic nature of the reaction. Additionally, the disappearance of the solid zinc as it undergoes dissolution is another indication that a chemical reaction has occurred.
What is an example of the formation of a precipitate?
Formation of a precipitate is evidence of a chemical reaction.
What evidence of chemical reaction would be seen when burning a match?
Burning is a chemical reaction (oxidation).
What observations give evidence that chemical reaction has happen?
No
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 of a chemical reaction is shown in the photo?
lol what photo
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.
How can you know this is a chemical reaction?
Evidence of a chemical reaction include the following: formation of a precipitate formation of a gas change in temperature change in color
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 evidence in chemical reaction in mole?
Mole is the the unit for amount of substance in SI.
What evidence of a chemical reaction might you see by rusting of an iron nail?
oxidation
What would not be evidence that a chemical reaction has occurred in a container?
a perfectly claen container
What is usually evident of a formation of a precipitate?
Formation of a precipitate is evidence of a chemical reaction.
What evidence is there that a reaction in fermentation?
During fermentation materials (reactants) are transformed in other substances (products) - a chemical reaction.
