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NO!!!
When neutralising an acid to an alkali , both of which are clear liquids, you do not see always see the product; it may appear to be another clear liquid.
e.g. Hydrochloric Acid and Sodium Hydroxide, which are clear liquids produce water a clear liquid and sodium and chloride ions which are not visible.
HCl(aq) + NaOH(aq) = H2O(l) + Na^+(aq) + Cl^-(aq)
What you can see, if an indicator is used, is the change of colour of the indicator.
However, a rusting nail (iron) is visible, but it takes days for the appearance to change, from shiny metal to red/brown of rust.
lenpollock
Wiki User
∙ 12y agoyes , all chemical reactions are visible
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Can a chemical reaction cause heat?
Yes, the signs of a chemical reaction are: gas, precipitation, heat, color change
What is a chemical reaction Hint Think of the table with signs of a chemical reaction?
The question does not have the enough required information that is required to accurately answer it.
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
How you can tell if a mixture is a chemical reaction?
a mixture is by definition not a chemical reactionA mixture is two or more substances which have been combined such that each substance retains its own chemical identity.So a mixture cannot be a chemical reaction, signs of a chemical reaction include:colour changeprecipitation (formation of a solid)effervescence (giving off gas)And every single chemical reaction involves gives of some heat.
Which in the following events is not a common sign that a chemical change taken place?
For example melting, boiling, evaporation, transformation in powder are not signs of a chemical reaction.
The changes that are visible during a chemical reaction are signs that the?
If it is a true or false question it is false
The changes that are visible during a chemical reaction are signs that the nuclei in the reactants have been rearranged.?
False.
What are the changes that are visible during a chemical reaction that are signs that the reactants have been rearranged?
If it is a true or false question it is false
Why........Give a everyday example of a chemical reaction Describe the signs that a reaction has taken place?
* digestion is a chemical reaction.* 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 - Change of the state of the matter - A violent reaction with explosion or fire - Bubbling - Emitting a sound - Emitting a light
What are the signs of physical change from a chemical change?
Signs of physical change - Change in appearance,taste,display of substance Signs of chemical change- Change in chemical reaction
Can a chemical reaction cause heat?
Yes, the signs of a chemical reaction are: gas, precipitation, heat, color change
Is a chemical reaction (Hint Think of the table with signs of a chemical reaction.)?
The question does not have the enough required information that is required to accurately answer it.
What is a chemical reaction Hint Think of the table with signs of a chemical reaction?
The question does not have the enough required information that is required to accurately answer it.
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
What are signs of a chemical reaction?
Some signs could be: *solids forming *bubbles *color change *temp. change
Why are formations of odor and color not always signs of a chemical reaction?
because a part of reactions either don't produce any gasses and/or solids or they are produced, but are odour- and/or colorless
What are the signs needed in chemical reaction?
color changeformation of a precipitatetemperature changeformation of gas bubbles
