The correct option is D.
In chemistry, a pure substance refers to a matter that possesses definite and constant composition with unique chemical properties. Another word for a pure substance is chemical substance. A pure substance typically contains only one type of atom or only one type of molecule. Examples of pure substances are water, sodium chloride, gold, silver, etc. In the question given above, we are told that the unknown element can only be broken down by chemical mean, this shows that the unknown compound is a chemical compound.
The names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)
From the question,
We are to determine the how the name of CaS differ from the name of CdS
First, we will determine the identities of the elements in the given compounds
Ca represents calcium
and
S represents sulfur
∴ The compound is named Calcium sulfide
Cd represents the element Cadmium
and
S represent the element Sulfur
∴ The compound is named Cadmium sulfide
Hence, the names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)
Learn more here: brainly.com/question/19078303
Sodium and Chlorine are both reactants in the equation. The product is the sodium chloride
answer this is so hard its impossible butt I'll ask my dad
