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a reaction has taken place when one or more of the following occur :
- a new substance is formed
- change in colour
- precipitate is formed
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∙ 13y ago
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What is meant of '. ' in chemical reaction?
'.' shows the multiplication in chemical reaction.
What shows a reaction in a solution consisting of only those particles directly involved in the chemical change?
Net-Ionic Equation
Are changes in properties always evidence of a chemical change and why?
No. Boiling water is a physical not a chemical change, and yet clearly steam has very different properties than liquid water does. A chemical change is one which will change the composition or identity of the material. So not only will its properties change, but it's chemical composition will also be changed
Is flammability a physical or a chemical?
Flammability is considered to be a chemical and not a physical change. This based on the fact that combustion will take place which is a chemical reaction.
What is chemical equeation?
Chemical equations show what happens when a chemical change occurs. For example, in the combustion of Hydrogen(H2), water(H2O) is formed. The chemical equation for this reaction is: 2H2 + O2 -----> 2H2O This chemical equation shows that when H2 reacts with O2 , H2O is formed.
What shows changes that take place during a chemical reaction?
A chemical equation
What are the five observations of chemistry that shows that a chemical reaction have taken place?
Formation of a precipitate; change in color; change in temperature; formation of a gas; emission of light.
What is meant of '. ' in chemical reaction?
'.' shows the multiplication in chemical reaction.
Is bananas turning black if you leave them in a warm cupboard for a week a chemical reaction and why?
Yes, it is a chemical reaction, because the colour of the banana has changed, which shows that a chemical reaction has taken place. Also, if the banana has gone black and turned bad, you can't change it back to it's original form, which proves that it is a chemical reaction and not a physical reaction. Remember - A chemical reaction has definitely taken place if : It's colour has changed A gas is given off There are energy changes Or, it can't be changed back to what it used to be! :) Hope this helps!!
How does a chemical equation show that a chemical reaction has occurred?
A chemical equation shows that chemical reaction has occurred as new substances have been formed from the reagents. A chemical equation has two sides before reaction and after reaction, if there is any change from the before reaction side to the after reaction side, it indicates that a chemical reaction has just occurred.
Which reactions shows a physical change?
Burning coal is a chemical reaction, a chemical change; but the solid reactant is transformed in gaseous products (H2O and CO2) - this is a physical change.
What chemical equation shows that no atoms are lost during a chemical reaction?
This is a balanced chemical reaction.
What shows the relationship between the reactants and products in a chemical reaction?
the coefficients of a balanced reaction
What shows a reaction in a solution consisting of only those particles directly involved in the chemical change?
Net-Ionic Equation
What tells the story of a chemical reaction?
The written statement that shows a chemical reaction is called an "equation". The representation of each reactant is called its chemical formula.
Are changes in properties always evidence of a chemical change and why?
No. Boiling water is a physical not a chemical change, and yet clearly steam has very different properties than liquid water does. A chemical change is one which will change the composition or identity of the material. So not only will its properties change, but it's chemical composition will also be changed
Is flammability a physical or a chemical?
Flammability is considered to be a chemical and not a physical change. This based on the fact that combustion will take place which is a chemical reaction.
