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It is the element helium, symbol He.

The change in sound is because helium is much lighter than air and thus the speed of sound in helium is much faster than the speed of sound in air. This change in the speed of sound retunes the resonant chambers in the vocal tract to a higher frequency, making the voice sound "chirpy" while the helium is present.

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Is the chemical formula H2o physical or chemical change?

The chemical formula H2O represents water. It is a chemical formula that describes the composition of a substance, in this case, water. Therefore, it is related to a chemical change rather than a physical change.


What are two effects caused by a chemical change?

Two effects that are caused by a chemical change are changes from one substance into another. Another effect that can be caused by a chemical change is a change in the temperature of the surrounding system and substance, or a change in color of the substance.


Is melting ice into water a chemical change?

No. It is a physical change. The chemical formula for water is H2O, and that is also the chemical formula for ice. So there is no chemical change taking place, only a change in the state of matter.


Can a chemical cause a chemical change?

A chemical change can be caused by a reaction. It an element or compound reacts with another, it is known as a chemical change.


What kind of change is caused by cutting?

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Is rusting a nail a physical change or chemical change?

A nail rusting is a chemical change. The chemical formula of the metal completely changes, adding oxygen to the formula. Iron changes from Fe to FeO2 , or to Fe2O3


What is needed for a chemical change to occur one or to answer?

chemical formula


Why ignition of matches is a chemical change?

The chemical formula is modified.


What has to happen for a chemical change to happen?

At least 2 of the reactants must change their chemical formula.


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A physical change doesn't modify the structure of a substance (the chemical formula).


Is taste a physical or chemical change?

Chemical, caused by saliva, without saliva you cannot taste anything


When ice melts why can you tell there is not a chemical change?

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