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gas is not always produced. Sometimees the reaction can change color. Also the temperature can change. gas is not always produced. Sometimees the reaction can change color. Also the temperature can change.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoNo.
Chemical reactions can yield any state of matter, depending on the reagents (stuff that goes into the reaction).
Gas can be the result of a physical reaction as well. For example, adding sufficient heat energy can turn a liquid or even some solids directly into a gas, or removing heat energy from a plasma will also yield a gas (that is usually no longer ionized like the plasma).
Wiki User
∙ 11y agoIt depends on the kind of bubbles!
When a liquid boils, it forms bubbles - but in this case it's only a physical change in the state of aggregation (from liquid to gaseous).
Another possibility in a physical cause of bubbles could be "out-gassing" of a physically solved gas in a liquid e.g. when you heat water of a lake, there forms tiny bubbles of oxygen because solubility decreases with rising temperature.
And now the case of a chemical reaction:
There you have a gas forming because of a chemical reaction - for example when you take the reaction between a (reactive) metal and an acid:
Mg + 2 HCl --> MgCl2 + H2(g)
In this case there is hydrogen (as a gas) which forms bubbles.
In a bottle of gassed mineral water you have both; physical and also chemical evolution of bubbles. Most of the carbon dioxide is solved physically in the water, but some is also bound chemically as carbonic acid H2CO3 which is not that stable and on shaking/heating splits up into CO2 and water:
H2O + CO2 <---> H2CO3
So forming of bubbles is not always an indication of a chemical reaction, but besides boiling of liquids a lot of gas evolutions are caused by a reaction!
Wiki User
∙ 15y agoNo. There are examples of reactions when the product is just a solid or just an aqueous solution.
Wiki User
∙ 13y agoYes. the signs of a chemical reaction include: releasing gas (commonly bubbles) and emitting light or heat
Wiki User
∙ 11y agono bc liquid changed to gas is a physical property
Wiki User
∙ 8y agoNo, eg when water evaporates no bubbles are formed.
Wiki User
∙ 11y agoYes it does
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Is Gas produced from a reaction is a phase change and not a chemical change.?
A gas released during a chemical reaction is a chemical change.
What is the sign in a chemical reaction that a gas has been produced?
You can see the release of this gas.
What must be produced in a chemical reaction to result in a chemical esplosion?
Usually a reaction must produce some sort of gas to be explosive.
What happens in a can of spoiled food as gas is produced?
A chemical reaction of food decomposition occured.
When iron is immersed in a solution of hydrochloric acid hydrogen gas is produced a physical or chemical property?
This is a chemical reaction.
Is Gas produced from a reaction is a phase change and not a chemical change.?
A gas released during a chemical reaction is a chemical change.
What is the sign in a chemical reaction that a gas has been produced?
You can see the release of this gas.
Why is it a sign of a chemical reaction if gas is given off?
It is sign of chemical reaction because smell and heat is produced.
What is the scientific word for a gas given off during a chemical reaction?
A reaction that emmits heat is called an exothermic reaction .
What is being produced when bubbles are present during a chemical reaction?
a gas
What are the four clues to a chemical reaction?
heat is produced, light is produced, gas is produced, the chemicals change color.
What must be produced in a chemical reaction to result in a chemical esplosion?
Usually a reaction must produce some sort of gas to be explosive.
What happens in a can of spoiled food as gas is produced?
A chemical reaction of food decomposition occured.
When iron is immersed in a solution of hydrochloric acid hydrogen gas is produced a physical or chemical property?
This is a chemical reaction.
When conducting a chemical reaction that produces gas you should use the?
If the gas produced is harmful, one should use the fume hood when conducting the reaction.
What does bubbling indicate in a chemical reaction?
The creation of bubbles in a liquid can result from:Boiling (formation of gas phase material) a physical changeDissolution of dissolved gasses (a physical change) from a liquid as it warmsThe creation of gases by reactants in an aqueous environment (chemical change)
Is iron dissolving in hydrochloric acid with the evolution of hydrogen gas a physical property?
No, the gas produced is a result of the chemical reaction.
