The answer to this question is option A which is a compound.
It is because Zoe is investigating the composition of substance A, an unknown substance.
Using chemical processes, she analyzes substance A and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1.
Finally, she found that the substance is a compound.
Answer: A. A compound
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: sodium hydroxide [tex](NaOH)[/tex]
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper [tex](Cu)[/tex]
Heterogeneous mixture : It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different. There is a physical boundary between the dispersed phase and dispersion medium. Example: Air
Homogeneous mixture : It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different. There is no physical boundary between the dispersed phase and dispersion medium. Example: salt water
