Exam Review/Class

atomic number

• number of protons/stands for an element

• number of neutrons

• number of electrons

• number of protons and neutrons

mass number

• number of protons

• number of electrons

• number of protons and electrons

• number of protons and neutrons

atomic symbol

• capital letter

• lowercase letter

• 2 capital letters

• 2 lowercase leters

Which of the following reactions is a combustion reaction ? 

• MgCO3 + O2 → MgO + CO2  
• C3H8 + 5O2 → 3CO2 + 4H2O 
  
• 6CO2 + 6H2O → C6H12O6 + 6O2 
• 6CO2 + 6H2O → C6H12O6 + 6O2 

Which of the following is a decomposition reaction?

• MgCo3 --> MgO + CO2 
• SO3 + H2O --> H2SO4
• 2 Mg + O2 --> 2MgO 

What is the atomic mass of this element?

• 20

• 60

• 40

• 41

What is the symbol of this element?

• Calcium

• P

• Ca

• C

The characteristics or properties of metals include

• shiny and solid
• ductile and malleable
• lose electrons
• all of the above

Water is an element?

• true
• false

A molecule is

• a singular particle of a particular element

• another name for an element

• 2 or more atoms that are combined