ECM Flashcards
What is an atom
An atom is the smallest possible particle that a substance can exist in
What is a molecule
A group of two or more atoms chemically combined together
What is a diatomic molecule
A molecule that consists of two atoms chemically combined together
What is a polyatomic molecule
A molecule that consists of three atoms or more chemically combined together
What is a triatomic molecule
A molecule that consists of exactly three atoms chemically combined together
Do molecules need to be made up of the same type of atom
No
Explain what an element is [4]
Matter in its simplest form
Building blocks of both living and non-living matter
Made up of only one type of atom
Cannot be broken down into simpler substances through chemical methods
What is a compound
A compound is a substance containing two or more elements chemically combined in a fixed composition
What are the properties of a compound
- Physical and chemical properties different from its constituent elements
- Elements in a compound always chemically combined in a fixed proportion by mass
- Compounds cannot be broken down by physical methods
What is a pure/impure substance
A pure substance consists of only one element or compound
An impure substance/mixture consists of two or more elements or compounds that are mixed but not chemically combined
Explain what a mixture is
A mixture is a substance consisting of two or more elements or compounds that are mixed but not chemically combined
The components of a mixture are not fixed in any ratio
What are the properties of mixtures
It has the physical and chemical properties of the substances that it is made up of
The components it is made up of are not fixed in any ratio
There is no chemical reaction when the substances are mixed, hence a mixture can be easily separated by physical methods
