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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.
No, signs of a chemical reaction are not always visible. Some reactions may be characterized by changes in temperature, the formation of gas, color changes, or the production of precipitates that are visible to the naked eye. However, some reactions, particularly those that are slow or occur in the solution phase, may not exhibit obvious visible signs.
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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.
What are the three visible signs of chemical reactions?
Some indicators of a chemical reaction are:- formation of new compounds - change of color- change of odor- release of a gas- change of the temperature (absorption or release)- change of the viscosity- formation of a precipitate- change of general appearance- possible explosion - sometimes a sound is produced - possible chemiluminescence
Are changes in properties always evidence of a chemical change and why?
Changes in properties are not always evidence of a chemical change. Physical changes, such as changes in state (solid to liquid) or appearance, can occur without any change in the chemical composition of a substance. Chemical changes involve the rearrangement of atoms and result in the formation of new substances with different properties.
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 nuclei in the reactants have been rearranged.?
False.
The changes that are visible during a chemical reaction are signs that the?
The changes that are visible during a chemical reaction are signs that the reactants are undergoing a transformation into one or more new substances with different properties. This transformation involves the breaking and forming of chemical bonds, resulting in the manifestation of various observable changes such as color, temperature, gas production, or precipitate formation.
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
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.
What are the 5 signs of a chemical changing?
Color change: A visible shift in color can indicate a chemical change. Gas production: Formation of bubbles or a gas can be a sign of a chemical reaction. Temperature change: Heating or cooling of the substance during the reaction. Precipitate formation: Solids forming in a solution. Odor change: A noticeable change in smell can indicate a chemical reaction has occurred.
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
What are the three visible signs of chemical reactions?
Some indicators of a chemical reaction are:- formation of new compounds - change of color- change of odor- release of a gas- change of the temperature (absorption or release)- change of the viscosity- formation of a precipitate- change of general appearance- possible explosion - sometimes a sound is produced - possible chemiluminescence
