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What chemical reactions have taken place when flames from a fire turn into ashes?
This is a reaction of combustion (oxidation, burning).
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.
How many types of chemical reactions are there?
normally there are a few chemical reactions the ones that i know of arecolour changeheat changefizzingbubblingthose are all i can remember sorryActually these aren't types of reactions. These are physical signs that a chemical reaction has taken place.
Do chemical reactions always make new substances?
No all chemical reactions do not make new things because if you do a chemical reactions using two of the same things e.g carbon dioxide + carbon dioxide you are not making anything else so no not all chemical reacions make new things
Do you think a chemical reaction has taken place Can you explain your reasoning behind your conclusion?
Yes, a chemical reaction has likely taken place if there is a change in the chemical composition of the substances involved. This can be observed through the formation of new substances, changes in color, temperature, or the release of gas. These are all indicators that a chemical reaction has occurred.
Why do you need indicators of chemical change?
Indicators of chemical change are needed to detect when a chemical reaction has occurred. They can provide visual cues, such as color changes or gas production, that indicate a chemical transformation has taken place. These indicators help scientists and chemists monitor and understand the progress of reactions.
How do you know if a chemical reactions has taken place?
Signs of chemical reactions may be: - Gas release - Formation of a precipitate - Change of color - Change of odor - Change of pH - Change of aspect - Change of viscosity - Change of the temperature - Visible formation of new compounds
What is it when water changes to water vapor?
When water changes to water vapor, it has changed its state from liquid to vapor and no chemical change has taken place. It's only a physical change.
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.
When paper turns yellow brown upon exposure to sunlight what type of change has taken place a chemical or physical change?
A chemical change has taken place. The exposure to sunlight causes the paper to undergo a chemical reaction, breaking down the molecules in the paper and causing the color change to occur.
Does no visible change mean no chemical reaction?
Not necessarily. A lack of visible change does not always indicate the absence of a chemical reaction. Some reactions may be occurring at a molecular level and not produce a noticeable alteration in appearance. It's important to consider other evidence, such as changes in temperature, gas production, or pH level, to determine if a chemical reaction has taken place.
What is rusting mean?
A chemical change has taken place
