UNIT 1 Review!! Lesson 1-5

What is atom?

• the basic unit of living organism

• determine the type of element composing

• basic building block for all matter in universe

• it can undergo chemical reaction, sharing of electrons

Atomic Mass

• Proton ⁺ Neutron

• Proton + Electron

• Atomic number + Neutron

• Electron + Neutron

Which statement is TRUE?

• Atoms as building blocks of matter, have volume that occupies space

• The neutron does have charge

• Atoms as extremely small and are made up matter

What are molecules?

• Molecules are groups of two or more atoms bonded together.
• Molecules are larger than cells and make up tissues.
• Molecules are only found in gases and not in solids or liquids.
• Molecules are single atoms that exist independently.

What is chemical bonding?

• Chemical bonding is the repulsion between atoms that prevents them from forming compounds.
• Chemical bonding is the attraction between atoms that allows the formation of chemical compounds.
• Chemical bonding refers to the physical separation of atoms in a gas state.
• Chemical bonding is the process of breaking down compounds into individual atoms.

What are the 2 types of chemical bonding?

• Ionic bonding and covalent bonding
• Covalent bonding and ironic bonding

• Ionic bonding and metallic bonding
• Metallic bonding and hydrogen bonding

Covalent Bonds ...

• share neutrons between atoms

• electron is donated to another

• giving out netrons between atoms

• share electrons between atoms

Choose an example of covalent bond.

• Water (H2O)

• Calcium carbonate (CaCO3)
• Iron oxide (Fe2O3)
• Sodium chloride (NaCl)

Choose an example for the ionic bond.

• Sodium chloride (NaCl)
• Oxygen (O2)

• Water (H2O)

• Carbon Dioxide (CO2)

What type of bond?

• Covalent bond

• ionic bond