All substances, whether they are elements, compounds, or mixtures, are made up of tiny particles. These particles are either individual atoms or groups of atoms called molecules.
atom: extremely tiny particles of matter. An atom is the smallest particle of an element that can exist. All substances are made up of atoms.
elements: substance that contains just one type of atom
compounds: substance that contains two or more different elements joined together by chemical bonds
mixtures: substance made up of two or more elements or compounds that are not joined together by chemical bonds
particles: small piece of a substance
molecules: type of particle made up of two or more atoms joined together by chemical bonds
Experiment: Reactive Metals
Problem: Which common metals are most reactive?
Hypothesis: To discover which metals are most reactive, we can put pieces of the metals in a weak acid and watch what happens. The one that fizzes most quickly will be the most reactive.
Materials: nail made of iron or steel galvanized (zinc-coated) nail nail made of copper or brass white vinegar three small jars one bowl
Experiment Steps 1. Put a nail into each of the three small jars. Pour just enough vinegar into the jars to cover the nails. Watch what happens for a few minutes. While you wait, ask an adult to heat a kettle of water.
When you are finished, answer the problem question using the link to the right!