Hydrogen (H) is an element. Hydrogen gas (H2) is a molecule.
Sodium chloride (table salt) is a compound - NaCl.
AnswerIron is an element. Periodic symbol Fe and atomic number 26.See the Related Questions to the left for more information.
Nitrogen is not a mixture it's an element.
It's a compound. H2O - Two hydrogen atoms, one oxygen atom Water is a compound as it can be reduced to simpler elements (Oxygen and water).It is a homogenous mixture("the same") as it is uniform throughout. E.g: Salt and sand mixed together would be a heterogenous mixture("different") as you can distinguish between sand and salt. A pure 'mixture' is usually homogenous, especially liquids.
Heterogenous
Gold is an element.
a burrito is a heterogenous mixture
No. Hydrogen gas is an element, making it a pure substance.
Hydrogen is none of both, not being a mixture but an ELEMENT.
carbon is an element
Answer: Homogeneous
An example of a compound that has definite properties is water, which always consists of two hydrogen atoms and one oxygen atom in a fixed ratio.