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What are two possible indications that a chemical change has taken place?
Wiki User
∙ 14y ago
Color Changes
As in the case of autumn leaves, a change in color is a clue to indicate a chemical change.
Perhaps you have found a half eaten apple that turns brown. The reason is that a chemical change has occurs when food spoils.
Odor Changes
It only takes one experience with a rotten egg to learn that they smell different that fresh eggs. When eggs and food spoil, they undergo a chemical change. The change in odor is a clue to the chemical change.
Production of Gases or Solids
The formation of a gas is a clue to chemical changes. The bubbles of gas that you observed form when an antacid is dropped into water is an example of change.
Another clue that a chemical change has occurred is the formation of a solid. A solid that separates out of solution during a chemical change is called a precipitate.
Energy - Absorbed or Released
Another sign of a chemical change is the release or gain of energy by an object.
Many substances absorb energy to undergo a chemical change. Energy is absorbed during chemical changes involved in cooking, like baking a cake.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoA color change, formation of bubbles, formation of a precipitate, or an odor.
Wiki User
∙ 12y agoIndicators of a chemical change include:
-change in colour
-bubbles
-flame
-change in heat, (this includes decrease as well as increase)
Wiki User
∙ 11y agochange in colour, temperature, light
formation of precipitate, evolution of gases
Wiki User
∙ 13y agoa new odor or a change in colour
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What are not clues that a chemical reaction has taken place?
Phase changes are one example of a non chemical change. If the substance reacts the same way chemically, it has the same properties such as melting point, there has not been a chemical change.
A change in color when two solutions are mixed together is a clue that what has taken place?
A change in the color of a solution is a sign thatthere is a chemical change happening. A chemical change happens when two substances combine forming another substance. It can also happen when two or more substances decompose.
What takes place when a substance undergoes a chemical change?
well the way i learned it, if you cannot bring something back to its original state its a chemical change. if you can, then its a physical change.For example-burning paper is a chemical change because you cannot bring that piece of paper back from the ashes.wrinkling paper is a physical change because you can unwrinkle the paper and bring it back to its original state.
What are three indicators of a chemical reaction occurring?
there are mainly two ways that indicate that a chemical change has taken place. These ways are the physical properties (the way things look, without changing the chemical makeup of a substance) are different, and the chemical properties (the way the substance reacts with other substances) are different.
Is scraping paint of a door a chemical change?
no. in order for a chemical change to take place the chemical make up of the paint would need to change, such as a color change. when you peel paint off a door you arent changing its chemical state.
What are some clear indications that a chemical reaction took place when two or more chemicals are combined?
Formation of a solid, formation of a gas, usually, but not always, change in temperature. Change in properties of the reactants.
What are four possible signs that a chemical reaction has taking place?
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 chemiluminescence -formation of new compounds
What are the evidences a chemical change has taken place?
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 chemiluminescence -formation of new compounds
What do you see when a chemical reaction takes place?
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 - formation of new compounds
What are some evidences of a chemical reation taking place?
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 chemiluminescence - formation of new compounds
What are not clues that a chemical reaction has taken place?
Phase changes are one example of a non chemical change. If the substance reacts the same way chemically, it has the same properties such as melting point, there has not been a chemical change.
What kind of change is taking place if white mold growing on a strawberry?
A chemical change is taking place.
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.
Did a chemical change take place in a light bulb?
Possible oxidation of the metallic filament with traces of oxygen existing in the light bulb.
Is corrosion of aluminium metal a physical change or a chemical change?
It is a chemical change. Through corrosion, a chemical reaction has taken place.
A change in color when two solutions are mixed together is a clue that what has taken place?
A change in the color of a solution is a sign thatthere is a chemical change happening. A chemical change happens when two substances combine forming another substance. It can also happen when two or more substances decompose.
What identifies a chemical change has taken place?
Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.
