Bunsen Burner: Burns to skin, hair, create noxious chemical fumes, can serve as an ignition source for other flammable materials, and can heat non-flammable surfaces to high temperatures.

Hammer: Damage fingers and other body parts, damage to surfaces, cause damage to other people.

Covalent Bonding: the interatomic linkage that results from the sharing of an electron pair between two atoms.

Ionic Bonding: type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound

Metallic Bonding: a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons and positively charged metal ions.

Limitation 1: Don't know what the five elements are (Dont know the names)

Ionic Bonds: One way would be to dissolve them in water. Ionic compounds will break into ions and allow the solution to conduct an electric current, whereas covalently bonded substances will not. Another way would be to find the substance's melting point.

Metallic Bonds: During a flame test, chemists take an unknown metal and put it under a flame. The flame will turn different colors based on which metal is in the substance.