Chemical Equations Balancing + review

What is the first step in balancing chemical equations?

• Ignore the atoms

• Change the coefficients of the atoms

• Change the subscripts of the atoms

• Count the atoms on each side of the equation

What is the big rule for balancing equations?

• Change the subscripts of the atoms

• Change the coefficients of the atoms

• Ignore the atoms

• Add new atoms

In the equation 2H2 + O2 -> 2H2O, how many hydrogens are there on each side?

• 2 on the left, 4 on the right

• 2 on the left, 2 on the right

• 4 on the left, 4 on the right

• 4 on the left, 2 on the right

What is the coefficient needed to balance the equation: H2 + O2 -> H2O?

• 4

• 3

• 2

• 1

When balancing equations, what can be considered as just one thing?

• Compounds

• Molecules

• Single atoms

• Polyatomic ions

In the equation CaSO4 + 2NaNO3 -> Ca(NO3)2 + Na2SO4, how many NaNO3 are there on each side?

• 2 on the left, 2 on the right

• 1 on the left, 2 on the right

• 1 on the left, 1 on the right

• 2 on the left, 1 on the right

What is the total number of oxygens in the equation: C + O2 -> CO2?

• 2

• 3

• 5

• 4

What coefficient is needed to balance the equation: H2 + O2 -> H2O?

• 3

• 4

• 2

• 1

What is the key rule to remember when balancing equations?

• Change the subscripts of the atoms

• Add new atoms

• Change the coefficients of the atoms

• Ignore the atoms

What type of reaction is this equation, Fe + O₂ --> Fe₂O₃?