1) 1. Which of the following equations is correctly balanced? a) 2H2+O2 --> 2H2O b) H2+O2 --> H2O c) 2H2+O2 --> H2O d) H2+O2 --> 2H2O 2) In the equation Fe2+O2 --> Fe2O3 what coefficient should be placed in front of Fe? a) 4 b) 2 c) 5 d) 3 3) How many atoms of oxygen are on the right side of the balanced equation 2KClO3 --> 2KCl+3O2? a) 6 b) 4 c) 3 d) 9 4) Which principle must be followed when balancing chemical equations? a) The charges must be equal on both sides b) The number of atoms of each element must be equal on both sides c) The number of molecules must be equal on both sides d) The coefficients must be equal on both sides 5) When balancing Ch4+O2 --> CO2+H2O, what coefficient should be placed in front of O2? a) 2 b) 3 c) 1 d) 4 6) Which of these is NOT a step in balancing chemical equations? a) Count the atoms on each side b) Add coefficients to balance atoms c) Verify the final equation is balanced d) Change the subscripts to balance atoms 7) What is wrong with this equation: N2+3H2 --> NH3? a) Too many nitrogen atoms on the left b) Too few nitrogen atoms on the right c) The coefficient of NH3 should be 2 d) The coefficient of H₂ should be 2 8) Which equation shows the correct balancing of Zn+HCl --> ZnCl2+H2? a) 2Zn+2HCl --> 2ZnCl2+H2 b) Zn+HCl --> ZnCl2+H2 c) Zn+3HCl --> ZnCl2+H2 d) Zn+2HCl --> ZnCl2+H2

Balancing Equations Practice

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