Question

A teacher listed the following substances on the board. CyH, OH CH3COC2H .Pbs Cd • BaSiF6 • Mn She asked her students to pick a substance from the list that is an element. Which of the following is correct?

A) PbS, because it is a pure substance
B) C2H2OH, because it is not a pure substance
C) Cd, because it is a pure substance
D) BaSiF6, because it is not a pure substance​

Answer 1

The correct answer is C) Cd because cadmium is a pure substance and it is an element on the periodic table.

Step-by-step explanation:

The student is asked to pick a substance from a list that is an element. A pure substance that cannot be broken down into chemically simpler components is referred to as an element. In contrast, a compound is a substance that can be broken down into chemically simpler components because it has more than one element. From the given options:

• PbS (Lead(II) Sulfide) is a compound, as that consists of lead and sulfur.
• C₂H₂OH (Ethanol) is incorrect as this represents a compound, not an element.
• Cd (Cadmium) is an element and it is a pure substance.
• BaSiF₆ (Barium Hexafluorosilicate) is also a compound, not an element.

Hence, the correct answer is C) Cd, because it is a pure substance and an element.