Balancing Equation Quiz

Balance this equation...
HgO --> 2Hg + O₂

• It is balanced 
• 2HgO --> Hg + O₂
• 2HgO --> 2Hg + O₂

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl

What happens during a chemical reaction?

• new elements are created

• atoms are destroyed

• atoms are rearranged

• elements are destroyed

What is the whole number that appears in front of a formula in a chemical equation?

• a coefficient

• an exponent

• a subscript

• a superscript

How many atoms of oxygen are represented in 2Ca(NO₃)₂?

• 4

• 6

• 10

• 12

What type of reaction is this?

H₂ + Cl₂ 🡪 2HCl?

• synthesis

• decomposition

• double replacement

• single replacement

What is the best category to describe the reaction

KHCO₃ 🡪 CO₂ + KOH?

• synthesis

• decomposition

• single replacement

• double replacement

_________ are the starting substances in the reaction while _________ are the substances formed.

The number of atoms of each element on both sides of the equation must be _______ because matter cannot be _______ or _________.

Remember that _____ must never be changed in order to balance an equation.