Question

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. What is substance A? A. A compound B. An element C. A heterogeneous mixture D. A homogeneous mixture

Answer 1

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 $(NaOH)$

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 $(Cu)$

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

Answer 2

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.