Balancing Chemical Equations and Reactions

This video tutorial provides a comprehensive guide to balancing chemical equations. It begins with an introduction to the basic setup of chemical equations, explaining the roles of reactants and products. The video outlines detailed steps for balancing equations, including writing unbalanced equations, counting atoms, and using coefficients. Helpful tips are provided, such as balancing one element at a time and treating polyatomic ions as single units. The tutorial includes examples, such as balancing equations with aluminum and copper II chloride, and offers practice with hydrogen peroxide decomposition. The video emphasizes the importance of double-checking work to ensure equations are balanced.

What are the substances called that come together and collide in a chemical reaction?

• Products

• Reactants

• Catalysts

• Inhibitors

What is the first step in balancing a chemical equation?

• Add coefficients

• Write out the unbalanced equation

• Count the number of atoms

• Reduce the coefficients

When balancing a chemical equation, what should you do if an element appears more than once per side?

• Balance it first

• Ignore it

• Double the coefficients

• Balance it last

In the example with aluminum and copper II chloride, why are there two chlorides in the formula for copper II chloride?

• Because copper has a charge of 1+

• Because copper has a charge of 2+

• Because chloride has a charge of 2-

• Because aluminum has a charge of 3+

What is the lowest common multiple of 3 and 2, used to balance chlorides in the aluminum and copper II chloride reaction?

• 2

• 3

• 5

• 6

When balancing polyatomic ions, how should you treat them?

• As individual atoms

• As single units

• Ignore them

• Double their coefficients

In the example with polyatomic ions, what do you need to do to balance the nitrates?

• Put a 2 in front of calcium chloride

• Put a 2 in front of silver nitrate

• Put a 3 in front of silver nitrate

• Put a 3 in front of calcium chloride

In the practice problem, what is the balanced equation for the decomposition of hydrogen peroxide?

• 2H2O2 -> H2O + 2O2

• H2O2 -> 2H2O + O2

• 2H2O2 -> 2H2O + O2

• H2O2 -> H2O + O2

How many oxygen atoms are there on the reactant side after placing a 2 in front of hydrogen peroxide in the practice problem?

• 6

• 4

• 3

• 2

What is the final step to ensure a chemical equation is balanced?

• Count the number of atoms

• Reduce the coefficients

• Add coefficients

• Double-check the number of each element