Question

elements, compounds & mixtures
= hydrogen (element)
= oxygen (element)
= water (compound)
= hydrogen & oxygen (mixture)
keep in mind:

• each circle is an atom of a specific element
• atoms touching are chemically bonded

elements are

pure substances

made up of the same type of atoms

found on the periodic table

examples: carbon, iron

compounds are

pure substances

created by two or more elements chemically bonded together.

examples: carbon dioxide, hydrogen peroxide

mixtures are

are not pure substances

2 or more substances physically combined.

the substances are not chemically bonded together.

examples: chocolate milk, rocks, chocolate cookies

now, it’s your turn!
is it an element, compound or mixture? provide evidence to support your answer.

Explanation:

Step1: Recall element definition

Elements are pure substances made of the same - type of atoms and found on the periodic table.

Step2: Recall compound definition

Compounds are pure substances created by two or more elements chemically bonded together.

Step3: Recall mixture definition

Mixtures are not pure substances, with 2 or more substances physically combined and not chemically bonded.

Answer:

Based on the definitions provided in the text, an element is a pure substance made of the same type of atoms (e.g., carbon, iron). A compound is a pure substance formed by two or more elements chemically bonded (e.g., carbon dioxide, hydrogen peroxide). A mixture is a non - pure substance with substances physically combined and not chemically bonded (e.g., chocolate milk, chocolate cookies). To determine if a given substance is an element, compound, or mixture, check if it is made of one type of atom (element), multiple types of atoms chemically bonded (compound), or multiple substances physically combined (mixture).