Click on this link if you need help. Chemistry STAAR resource sheet

Launch the Phet Simulation for Balancing Chemical Equations.

1. In the "Introduction" tab, have "Balance Scales" displayed by selecting the option in the bottom left. Atoms of each element will appear on the left (reactants) and right (products) of each balance as coefficients are changed. Play with the three reactions, which can be selected at the top right.
2. Select the "Balancing Game" tab. Complete Levels 1-3 to get the most practice out of the simulation. You may choose whether you want to be timed by turning the stopwatch "On" or "Off." You may do your work on a separate sheet of paper to help practice your approach to balancing equations.

Click to Run

Source: Balancing Chemical Equations, Phet, University of Colorado at Boulder

Using your rules for formula writing, write and balance the following chemical reactions.

1. magnesium + iron(III) carbonate → magnesium carbonate + iron

   Interactive popup. Assistance may be required.

   Check Your Answer

   3 Mg + Fe₂(CO₃)₃ → 3 MgCO₃ + 2 Fe

2. calcium chloride + silver nitrate → calcium nitrate + silver chloride

   Interactive popup. Assistance may be required.

   Check Your Answer

   CaCl₂ + 2 AgNO₃ → Ca(NO₃)₂ + 2 AgCl

3. sodium hydroxide + ammonium phosphate → sodium phosphate + ammonia + water

   Interactive popup. Assistance may be required.

   Check Your Answer

   3NaOH + (NH₄)₃PO₄ → 3NH₃ + Na₃PO₄ + 3H₂O