Intro To Chem

Question 1

Define atom, element, molecule, compound and mixture

Answer 1

Atom - smallest particle of matter and is made up of protons, neutrons and electrons.

Element - only made up of one sort of atom.

Molecule - 2 or more atoms covalently bonded together, can be the same element or different.

Compound - 2 or more diff types of atoms forming an ionic or covalent bond.

Mixture - 2 or more different elements/compounds in the same space.

Question 2

Define acid, base, alkali and salt

Answer 2

Acid - substance that donates H+ ions

Base - substance that accepts H+ ions

Alkali - base that releases OH- ions in aq solution

Salt - formed when H+ ions from an acid are replaced by a metal or ammonium ion