How do you know a gas is formed in a chemical reaction?

Answer 1

Many chemical substances include gas such as hydrogen or oxygen. When chemical reaction occurs becausre of exposure to heat at various degrees or for some other reason like fermentation ,the molecules which are found in separate chemicals unite together and gas is produced.

Answer 2

Formation of gas doesn't necessarily mean that a chemical change has occured. Possibly, gas can be created from a chemical reaction, but a liquid turning into a gas is a physical reaction, not a chemical one. Natural gas, or methane, is the fuel used in many kitchen ranges. When it burns, no mass is lost, but just because the mass isn't lost doesn't mean that there's no color change, which is physical.

Answer 3

Contact of alkali metals with water produce Hydrogen gas. Contact of active metals with a strong acid produce Hydrogen gas. Elecrolyses of chloride salts produce Chlorine gas.

Answer 4

Gas can be a product of both chemical and physical reactions.

Answer 5

mentos and coke/lemonade

hydrochloric acid and calcium carbonate chips

Plenty more too!

Answer 6

Almost Every Gas produce Some sort of chemical Reaction Except Inert gases like neon, xenon, argon

Answer 7

This gas is a product of the chemical reaction.

Answer 8

Gas Bubbles form on in the liquid.