Question

name: when elements combine in certain proportions into a new substance, a compound is formed. the new substance has totally different properties than the starting substances and cannot be broken apart except by chemical reaction. for example, h2o has hydrogen and oxygen as elements. while ne is an element. identify the following as elements (e) and or compounds(c): o2__ hcl co2 fe mgbr2__

Explanation:

• An element is a pure substance that cannot be broken down into simpler substances by chemical means.
• A compound is a substance formed when two or more elements chemically combine in a fixed proportion.
• \(O_2\) is made of only oxygen atoms. So, it is an element.
• \(HCl\) is made of hydrogen and chlorine atoms chemically combined. So, it is a compound.
• \(CO_2\) is made of carbon and oxygen atoms chemically combined. So, it is a compound.
• \(Fe\) is made of only iron atoms. So, it is an element.
• \(MgBr_2\) is made of magnesium and bromine atoms chemically combined. So, it is a compound.

Answer:

\(O_2\): E, \(HCl\): C, \(CO_2\): C, \(Fe\): E, \(MgBr_2\): C