chapter 3 hw\n3.1 classify each of the following pure substances as an element or a compound:\na. a silicon…

chapter 3 hw\n3.1 classify each of the following pure substances as an element or a compound:\na. a silicon (si) chip\nb. hydrogen peroxide (h₂o₂)\nc. oxygen gas (o₂)\nd. rust (fe₂o₃)\ne. methane (ch₄) in natural gas

chapter 3 hw\n3.1 classify each of the following pure substances as an element or a compound:\na. a silicon (si) chip\nb. hydrogen peroxide (h₂o₂)\nc. oxygen gas (o₂)\nd. rust (fe₂o₃)\ne. methane (ch₄) in natural gas

Answer

Explanation:

Step1: Recall element - compound definition

An element is a pure substance made of only one type of atom. A compound is a pure substance made of two or more different types of atoms chemically combined.

Step2: Analyze silicon (Si) chip

Silicon is made of only silicon atoms. So it is an element.

Step3: Analyze hydrogen peroxide ($H_2O_2$)

It is made of hydrogen and oxygen atoms chemically combined. So it is a compound.

Step4: Analyze oxygen gas ($O_2$)

It is made of only oxygen atoms. So it is an element.

Step5: Analyze rust ($Fe_2O_3$)

It is made of iron and oxygen atoms chemically combined. So it is a compound.

Step6: Analyze methane ($CH_4$)

It is made of carbon and hydrogen atoms chemically combined. So it is a compound.

Answer:

a. Element b. Compound c. Element d. Compound e. Compound