overview of the elements compounds and mixtures chapter in short
Answers
What is an element?
An element is a pure substance which is made up of only one kind of atom and cannot be broken down into two or more pure substance or by any chemical means.
What is a compound?
A compound is a pure substance formed by the chemical combination in a fixed proportion by mass.
What is a molecule?
A molecule is the smallest particle of a compound.
SUBSTANCES
Pure Substances Impure Substances
Elements Homogeneous
Compounds Heterogeneous
Metals
A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile.
Non-Metals
A non-metal is a material that is either soft or solid non-metals don't have a lustrous surface, Bromine (Br) is the only non-metal which is liquid.
*Diamond is the hardest naturally occurring substance found on Earth*