
Elements, Compounds & Mixtures
Flashcard
•
Chemistry
•
7th Grade - University
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an element?
Back
An element is a pure substance that consists of only one type of atom. Examples include hydrogen (H), oxygen (O), and gold (Au).
2.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more different types of atoms bond together. Examples include water (H2O) and carbon dioxide (CO2).
3.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.
4.
FLASHCARD QUESTION
Front
What is a molecule?
Back
A molecule is the smallest unit of a compound that retains the chemical properties of that compound. It consists of two or more atoms bonded together.
5.
FLASHCARD QUESTION
Front
What is an atom?
Back
An atom is the basic unit of matter and the smallest unit of an element. It consists of protons, neutrons, and electrons.
6.
FLASHCARD QUESTION
Front
What is the difference between a homogeneous mixture and a heterogeneous mixture?
Back
A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., salad).
7.
FLASHCARD QUESTION
Front
Can an element exist as a molecule?
Back
Yes, some elements can exist as molecules, such as O2 (oxygen) and N2 (nitrogen), where two atoms of the same element bond together.
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