Atoms – the smallest building blocks of all matter. Everything is made of atoms! Cathode – the positive end of a battery, marked with a plus (+) sign. Chemical energy – the energy stored in the ...

Molecules: groups of atoms bonded together. Chemical Reaction: the process of atoms and molecules creating or breaking bonds; often leads to a change in color, smell, temperature, or other changes in ...

State symbols are used in symbol equations to show whether each chemical is a solid, liquid, gas or solution. But it’s often hard to know exactly what’s going on. We can use word equations to ...