1)between iron and steel which is an example of a pure substance? and a mixture? explain your answer
2)between oxygen and carbon dioxide which is an example of element? and a compound? explain your answer
3)between sand and air which is an example of homogeneous mixture? a heterogeneous mixture? explain your answer
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Answer:
1. Iron Is a pure substance because it is an element representing Fe while steel is a mixture because it is not considered a compound. This is due to iron not chemically bonding with steel and other elements.
2. Oxygen is an element because its atoms does not bond with atoms from other elements while carbon dioxide is a compound because the atoms of Carbon and Oxygen, with its molecule having 2 oxygen atoms and 1 carbon atom.
3. Sand is heterogeneous because it does not have properties, composition and appearance throughout the mixture while air is homogenous because of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances which make up air being uniform to each other in the mixture.