10 Questions
What is a chemical element?
A substance that cannot be made into a simpler form by ordinary chemical means
What are compounds?
Chemical substances made up of two or more elements that are chemically bound together in a fixed ratio
What is a pure substance?
Substances that contain only one type of particle and are free from any mixture
What is the smallest unit of a chemical element?
Atom
What do compounds create when two or more atoms link up?
Molecule
What are the nine elements that make up almost 99% of the Earth's composition?
The nine elements are oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium, and titanium.
Explain how a chemical element is defined.
A chemical element is a substance that cannot be made into a simpler form by ordinary chemical means, and the smallest unit of a chemical element is an atom.
Define compounds and provide an example.
Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio. An example is water, which is composed of hydrogen and oxygen.
What are pure substances and provide examples?
Pure substances are substances that contain only one type of particle and are free from any mixture. Examples include gold, silver, iron, and aluminum.
Explain how atoms exist and their relationship to molecules.
Atoms are the smallest unit of a chemical element. When two or more atoms link up, they create a molecule.
Test your knowledge of the most abundant elements on Earth with this quiz. Explore the occurrence of elements and their composition in the Earth's crust while learning about the fundamental principles of chemistry.
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