atoms, elements, and compouds Flashcards
What is an element?
A substance which cannot be broken down into something smaller and consists of one type of atom.
Give an example of a monatomic element.
Sodium (Na)
What is a molecule?
A group of two or more atoms bonded together.
What is a diatomic molecule example?
Diatomic Chlorine (Cl2)
What does the term ‘miscible liquids’ refer to?
Liquids which dissolve into each other producing a solution.
Provide an example of miscible liquids.
Ethanol alcohol and water.
What are ‘immiscible liquids’?
Liquids which do not dissolve into each other.
Give an example of immiscible liquids.
Oil and water.
What is a compound?
A substance which contains two or more different elements chemically combined.
Provide an example of a compound.
Glucose (C6H12O6) and water (H2O).
What is a mixture?
A substance which contains two or more elements or compounds physically combined.
Provide an example of a mixture.
Air is a mixture of gases.
What is a key difference in composition between compounds and mixtures?
Compounds have a definite, fixed composition; mixtures have no definite composition.
How are compounds typically separated?
Difficult to separate into original substances.
How are mixtures typically separated?
Easier to separate into original substances.
