Q. 3.1 - An Introduction to General, Organic, and Biological Chemistry

Question

Classify each of the following pure substances as an element or a compound:

a. silicon ($Si$) chip

b. hydrogen peroxide $\left({\mathrm{H}}_2{\mathrm{O}}_2\right)$

c. oxygen gas $\left({\mathrm{O}}_2\right)$

d. rust  $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$

e. methane $\left({\mathrm{CH}}_4\right)$ in natural gas

Step-by-Step Solution

Answer

a. Silicon is a element

b. hydrogen peroxide is a compound

c. oxygen gas is a element

d. rust is a compound

e. methane is a compound

Step 1: Silicon chip (a)

 a) A pure substance is matter which can not be separated by any physical or chemical action. There are two sorts of substance:
(1) Elements
(2) Compounds
An element could be a pure substance composed of just one style of material.
A compound is additionally a pure substance composed of the atoms of two or more elements. they're chemically combined within the same proportion.

Silicon is part. A silicon ($Si$) chip is equipment. It consists of small crystals of Silicon (Si). it's composed of just one variety of material.
Therefore, a silicon ($Si$) chip is a part. 

Step 2: Hydrogen peroxide

(b) oxide $\left({\mathrm{H}}_2{\mathrm{O}}_2\right)$ may be a strong oxidizer. it's a compound with an oxygen-oxygen covalent bond. it's composed of hydrogen and oxygen. they're chemically combined within the same proportion.
Therefore, peroxide $\left({\mathrm{H}}_2{\mathrm{O}}_2\right)$ could be a compound. 

Step 3: Oxygen gas (c)

(c) Oxygen $\left({\mathrm{O}}_2\right)$ is part. it's represented by the symbol $\left({\mathrm{O}}_2\right)$. The number of oxygen is $8$, and it's placed in group $6A\left(16\right)$. it's a robust chemical agent. Therefore oxygen $\left({\mathrm{O}}_2\right)$ is a part. 

Step 4: Rust (4)

(d) Rust $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$is that the common name for iron oxide. Rust is corrosion, which occurs when oxygen combines with metal (Fe).
Therefore, rust $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$ may be a compound.

Step 5: Methane (e)

(e) Methane $\left({\mathrm{CH}}_4\right)$ could be a colorless and odorless gas. it's the most component of fossil fuel.
Methane could be a simple alkane. it's a compound composed of carbon and hydrogen.
Therefore, methane $\left({\mathrm{CH}}_4\right)$ in fossil fuel may be a compound.