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What are four things that indicate that a chemical change may have taken place?
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Is a change in the temperature a physical change?
Not necessarily. It does, however, indicate that a reaction is taking place.
What are 4 things that indicate a chemical change?
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 causes a chemical change?
No, not always. For example, if you mix salt and water, no chemical change takes place. The salt dissolves in the water and a solution is formed, which is not a chemical change because the salt and water retain their individual chemical compositions.
What are four types of evidence that indicate that a chemical reaction may have taken place?
1. A colour change occurs 2. A gas is evolved. 3. A precipitate is formed. 4. A large energy change occurs.
What is an example of a color change that does not indicate a chemical reaction?
Many materials can change colour according to the temperature without there being any chemical reaction taking place.
Does precipitation indicate that a chemical change has taken place?
In most of the cases it is true but in some cases the reactants may also form the precipitates.
You place an ice cube on the sink and it begins to melt . is this a chemical reaction?
This is a physical change. Chemical changes are changes in "what things are made out of".
Is a change in the temperature a physical change?
Not necessarily. It does, however, indicate that a reaction is taking place.
What kind of change is taking place if white mold growing on a strawberry?
A chemical change is taking place.
What are 4 things that indicate a chemical change?
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 three things would you look for that would indicate that a chemical reaction is taking place?
A change in the heat of the surrounding solution/air. As all chemical reactions produce or use up energy. A precipitate forming or a solid forming after two solutions have been reacted. A gas being given off (or effervescence)
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.
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.
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.
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 causes a chemical change?
No, not always. For example, if you mix salt and water, no chemical change takes place. The salt dissolves in the water and a solution is formed, which is not a chemical change because the salt and water retain their individual chemical compositions.
