What is an Atom?
All substances are made up of atoms. An atom is the smallest part of an element.
"Matter cannot be created or destroyed, only transformed."
— Law of Conservation of Matter
— Law of Conservation of Matter
- Atoms are represented by unique chemical symbols.
- There are 118 elements in the Periodic Table.
Beryllium (Be) Atomic Structure
Elements, Compounds & Mixtures
Match the terminology to the correct definition by clicking them.
Element
Compound
Mixture
Two or more atoms that are chemically bonded.
A combination of substances that can be physically separated.
Consists of the same type of atoms.
Naming Compounds
Rule 1: -ide
Metal + Non-metal compound.
Example: Sodium + Chlorine = Sodium Chloride
Rule 2: -ate
3+ elements (one being Oxygen).
Example: Sodium + Carbon + Oxygen = Sodium Carbonate
Progress Check: Naming
Calcium + Bromine
Potassium + Iodine
Iron + Sulphur
Sodium + Iron Sulphate
+
Balancing Equations
How to Balance:
Balancing equations obeys the Law of Conservation of Matter: the total number of atoms of each element must be the same on both sides.
- Note the atoms of each element on the reactant (left) and product (right) side.
- Find multiples so they are equal. Change coefficients (the number in front), not subscripts.
H2 +
O2 →
H2O
Balanced
Unbalanced
CO +
O2 →
CO2
Balanced
Unbalanced
Al +
Cl2 →
AlCl3
Balanced
Unbalanced
Fe +
Br2 →
Fe2Br3
Balanced
Unbalanced
N2 +
H2 →
NH3
Balanced
Unbalanced
Fe2O3 +
CO →
Fe +
CO2
Balanced
Unbalanced
CH4 +
O2 →
CO2 +
H2O
Balanced
Unbalanced