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In theory it is a pure element. However, due the the cost of obtaining really pure helium, it is likely to contain trace amounts of other gases.
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Is the helium in a balloon a substance or a mixture?
Helium is an element (and therefore a pure substance) yes
Is chromium a pure substance or mixture?
Pure substance.
Is soda water a pure substance or mixture?
Soda water is a mixture not a pure substance
Is cocoa a pure substance or mixture?
It is a mixture of compounds.
Is toluene a pure substance or mixture?
Toluene is a compound. not a mixture
Is the helium in a balloon a substance or a mixture?
Helium is an element (and therefore a pure substance) yes
Is helium gas a pure substance or mixture?
Helium is pure as it is on the periodic table.
Is helium is pure or mixture?
Helium is a pure substance
Is helium gas a mixture or substance?
Helium gas is a pure substance
Is helium gas substance or mixture?
Helium gas is a pure substance
Is helium gas mixture or pure substances?
Helium gas is a pure substance
Is helium a pure substance or a homogeneous or heterogeneous mixture?
Helium is an element which makes it a pure substance.
Is helium gas a homogeneous mixture or heterogeneous mixture?
Neither. Helium is not a mixture at all, it is a pure substance.
Is helium gas a homogeneous mixture or a heterogeneous mixture?
Neither. Helium is not a mixture at all, it is a pure substance.
Is helium gas a mixture?
No. Helium is an element, which makes it a pure substance.
Is helium inside a balloon a pure substance or mixture?
Natural air is always a mixture, and more or less homogenous in its major constituents. However, if the balloon was inflated by mouth, it will have less oxygen and more carbon dioxide than the air outside the balloon, which is also a mixture.
Is the air inside a balloon a pure substance?
In a helium balloon- one that floats and rises to the ceiling it is elemental helium that is used to inflate the balloon. If you just blow into a balloon to inflate it then it is air inside the balloon which is a mixture of gases, principally nitrogen and oxygen (both elements). There are also other gases that are chemical compounds such as carbon dioxide.
