Science test chemestry

Why do some metals require Roman numerals in their names while other do not?

Some metals require Roman Numerals in their names while other do not because the Roman Numerals are only used if a element has more then one charge if they don’t have more then one then it not needed.

What is the key difference between ionic and molecular compounds in terms of naming rules?

​Ionic compounds, typically formed between metals and nonmetals, are named by stating the cation (metal) first followed by the anion (nonmetal) with an "-ide" suffix (e.g., sodium chloride), whereas molecular compounds, composed of nonmetals, use prefixes to indicate the number of each atom and an "-ide" suffix for the second element (e.g., carbon dioxide).

CFCs definition

gasses used in refrigeration that causes damage to the ozone layer.

Mercury definition

element that can form a toxic compound.

Benzene definition

hazardous chemical that is used when making plastics.

Compounds definition

It is a pure substance made up of two or more elements that are chemically combined.

Characteristics of ionic compound

bond: Ionic Bond

structure: Crystals

Melting Point: High

Conductivity: conducts electricity

State at room temperature: solid

Characteristics of Molecular compounds

Bond: Covalent bond

Structures: molecules

Boiling point: Low

Conductivity: poor conductor, insulator

states at room temperature: solid, liquid, gas

Molecules definition

Molecules are two or more atoms that have bonded together. They may be composed of atoms of the same element or of different elements.

Ionic Compound definition

A compound made up of cations(+) and anions(-)

Multivalent Atom definition

An atom that can form more than 1 charge when it forms an ion

Monoatomic Ion

an ion made up of only 1 atom

Polyatomic Ion

an ion made up of 2 or more atoms

Covalent Bond definition

bond formed when atoms share electrons

Examples of diatomic covalent molecules

Hydrogen H2

Nitrogen N2

Oxygen O2

Fluorine F2

Chlorine Cl2

Bromine Br2

Iodine I2

ionic bond definition

Electrostatic force between cation (+) and anion (-)