[1NA] Chapter 3: Explore Diversity of Matter by Its Chemical Composition

Key Definition

Matter: any substance (thing) that has mass and takes up space.

Atoms: smallest particles of an element that have the chemical properties of that element.

Element: it is a pure substance that cannot be broken down into two or more simpler substances by chemical processes.

Molecule: a molecule is a group of two or more atoms that are chemically combined (joined together)

Compound: it is a pure substance containing two or more elements that are chemically combined in a fixed ratio.

Key Ideas

  1. Matters can be broadly classified into 3 groups: element, compound and mixture.
  2. Elements can be broadly classified into metals and non-metals (hint: the ladder a.k.a Hays-McDaniel line)