Question

we drink water. we breathe out carbon dioxide. we use salt in our foods. what do these substances have in common?
compounds
1 elements are ______
______ found in nature in their pure form.
2 they are usually found in ______
3 what is a compound?
examples:
when elements combine to make a compound the new substance has properties from the original. they may have a new ______
practice: element or compound?

1. methane ch₄ ______
2. sulfur s₈ ______
3. hydrogen peroxide h₂o₂ ______
4. sulfuric acid h₂so₄ ______
5. ozone o₃ ______
6. nitrous oxide n₂o ______

chemical bonds

Explanation:

Step1: Analyze Methane ($CH_4$)

Methane has formula $CH_4$, composed of C and H atoms. So it's a compound.

Step2: Analyze Sulfur ($S_8$)

Sulfur is $S_8$, made of only S atoms. So it's an element.

Step3: Analyze Hydrogen Peroxide ($H_2O_2$)

$H_2O_2$ has H and O atoms. So it's a compound.

Step4: Analyze Sulfuric Acid ($H_2SO_4$)

$H_2SO_4$ has H, S, O atoms. So it's a compound.

Step5: Analyze Ozone ($O_3$)

Ozone is $O_3$, made of only O atoms. So it's an element.

Step6: Analyze Nitrous Oxide ($N_2O$)

$N_2O$ has N and O atoms. So it's a compound.

Answer:

1. Methane: Compound
2. Sulfur: Element
3. Hydrogen Peroxide: Compound
4. Sulfuric Acid: Compound
5. Ozone: Element
6. Nitrous Oxide: Compound