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Is turning a penny gold a chemical or physical reaction?
Turning a penny gold is a physical reaction rather than a chemical reaction. This process involves coating the penny with a layer of gold, which changes its appearance but does not alter the chemical composition of the penny itself.
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.
What can be evidence of a chemical reaction?
Evidence of a chemical reaction can include formation of a gas, color change, temperature change, formation of a precipitate, or production of light. These observable changes indicate a transformation of substances into new molecules with different properties.
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.
Is dropping a Tums in water a chemical change?
Yes, dropping a Tums in water is considered a chemical change because the active ingredient in Tums, calcium carbonate, reacts with water to form calcium hydroxide and carbon dioxide. This chemical reaction alters the composition of the Tums tablet and the water.
What evidence of a chemical reaction might you see by dropping an alka seltzer in water?
When dropping an Alka-Seltzer in water, you may observe fizzing or bubbling, indicating the release of carbon dioxide gas as a result of a chemical reaction between the citric acid and sodium bicarbonate in the tablet. The tablet dissolves in water, causing the reaction to occur.
What evidence of chemical reaction would be seen when burning a match?
Burning is a chemical reaction (oxidation).
Why does a change in temperature indicate that a chemical reaction may occur?
Because a chemical reaction has different sign's. And heat is one. But if the temperature is dropping then it is not going through a chemical change.
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
Why does a chemical change in temperature indicate that a chemical reaction may have occurred?
A change of temperature implies that some energy has been transfered or used. Since chemical reactions either require or release energy to occur, the environment may change temperature as the substances react.
Is turning a penny gold a chemical or physical reaction?
Turning a penny gold is a physical reaction rather than a chemical reaction. This process involves coating the penny with a layer of gold, which changes its appearance but does not alter the chemical composition of the penny itself.
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.
