Balancing Equations (Primer)

In chemical reactions which of the below is correct?

• Atoms and Mass are not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• No atoms are moved around.
  

Which side of a chemical equation is the reactant side?

• Left (before the yields sign)
• Right (after the yields sign)

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

2H₂ + O₂ -> 2H₂O

On the right (after the arrow) of the equation is the:

• Coefficient
• Product
• Reactant
• Subscript

2H₂ + O₂ -> 2H₂O

On the left side of the arrow of a chemical equation are the:

• Coefficients

• Products

• Reactants

• Subscripts

Which side of a chemical equation os the product side?

• Left (before the yields sign)
• Right (after the yields sign)

How many different Elements are in C₂H₈O ?

(hint the question is NOT number of atoms)

• 2
• 1
• 3
• 0

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

2H₂ + O₂ -> H₂O

The little numbers in red:

• Look cool

• Tells you what the products are and how many there are.

• Tells you what the reactants are.

• Tells you how many of each atom there are.

How many atoms of Hydrogen are in this water molecule (look at the picture)

Hint: H is code for Hydrogen atom

• 1
• 2
• 3
• 4

Answer explanation

The picture shows 1 big red atom which is an Oxygen (O) atom.

The picture shows little green molecules which are Hydrogen (H) atoms.

Count little green atoms and there are two!