# Chapter 1 Basic Concepts of Chemistry - Study Questions - Page 21: 6

A) Pt is an element, and $Pt(NH_3)_2Cl_2$ is a compound. B) Copper is an element, and copper(II) oxide is a compound. C) Silicon is an element, and sand is a compound.

#### Work Step by Step

A) Pt is an element, and $Pt(NH_3)_2Cl_2$ is a compound. B) Copper is an element, and copper(II) oxide is a compound. C) Silicon is an element, and sand is a compound.

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