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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.
What else can I help you with?
Is it true or false that indications of a chemical change include light heat and gas production?
True. Light, heat, and gas production are indications of a chemical change. These signs suggest that a chemical reaction is taking place, which involves the formation of new substances with different properties than the original substances.
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.
How do you know when a chemical change has occurred?
There are many waysif something is burned (not heated or melted but burned)if something changes colorif something spoils or tarnishesif something does not go through a stage of matter such as melting, freezing, evaporating, condensing, sublimatingif something does not just dissolveif something can not be separated in any way
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.
How will you know that a chemical reaction has occurred?
You can identify a chemical reaction by observing changes such as the formation of a gas, a precipitate, heat, light, or a color change. Moreover, you may notice changes in properties such as odor, temperature, or pH levels. Testing for the presence of new substances or products can also confirm a chemical reaction has taken place.
Is it true or false that indications of a chemical change include light heat and gas production?
True. Light, heat, and gas production are indications of a chemical change. These signs suggest that a chemical reaction is taking place, which involves the formation of new substances with different properties than the original substances.
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 indicates that a chemical change might be taking place?
A chemical reaction occurs when a chemical change takes place. Meaning that for example, say burning wood is a chemical change. The wood turns into a new substance causing a new properties to form. Like a paper in shreads is a physical change because it is still paper and made from the same state. Sand into glass is a chemical change because it isn't sand anymore of course but was heated and shaped to become a chemical change
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.
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.
What is the only way to confirm that a chemical change has taken place?
To be certain that a chemical change has taken place you check the composition of the sample before and after the change. The following is a chemical property of water at 4 C is its ability to decompose into hydrogen and oxygen.
When cheese is cut into a slices does a chemical formula takes place.?
I assume you mean chemical "change" and the answer is no, it is a physical change that takes place.
