Molecules Quiz Review

Identify the formula as an element, compound, and/or molecule. MgCl2

• Element
• Compound
• Molecule

Identify the formula as an element, compound, and/or molecule. H2O

• Element
• Compound
• Molecule

Identify the formula as an element, compound, and/or molecule. O3

• Element
• Compound
• Molecule

Identify the formula as an element, compound, and/or molecule. Fe

• Element
• Compound
• Molecule

Identify the formula as an element, compound, and/or molecule. 3NaCl

• Element
• Compound
• Molecule

Identify the formula as an element, compound, and/or molecule. Cl2

• Element
• Compound
• Molecule

Which statement is true?

• All atoms are composed of molecules, but not all molecules are composed of atoms.
• All compounds are molecules, but not all molecules are compounds.
• All molecules are compounds, but not all compounds are molecules.

A chemical formula is like a recipe for a chemical substance. What is true about a chemical formula?

• It is a picture of atoms bonded together to form molecules.
• It identifies which elements are in the chemical substance using chemical symbols.
• It identifies all of the different components in mixtures, like peanuts and M&Ms.

What is an example of a chemical formula?

• Trail Mix
• Air
• NH4
• 

Explain what happens to the elements’ chemical properties when a compound forms.

• The chemical properties change to something new.
• The chemical properties stay the same.
• The chemical properties explode into a burst of flame.