Obeying the Law of Conservation of Matter Balancing Chemical Equations

What are differences between subscripts and coefficients? SubscriptsCoefficients go below and after the element go in front of the whole compound tell you how many atoms of that element tell you how many of the whole compound are used to balance the charges of a compound are used to balance the whole equation

What might you see to tell you a chemical reaction has happened? Color Change Bubbles Opacity change (becomes foggy – precipitate forms)

What is happening to the bonds in a chemical reaction? Some bonds are being broken, and new bonds are being formed. (Atoms are changing what they are connected to.)

1. Use coefficients to balance the following reaction: ___F 2 + ___H 2 O  ___HF + ___O 2 __2_F 2 + __2_H 2 O  _4_HF + ___O 2

2. Use coefficients to balance the following reaction: ___Ca 3 P 2 + ___H 2 O  ___PH 3 + ___Ca(OH) 2 ___Ca 3 P 2 + _6__H 2 O  __2_PH 3 + __3_Ca(OH) 2

3. Use coefficients to balance the following reaction: ___Na 2 O + ___H 2 O  ___NaOH ___Na 2 O + ___H 2 O  _2__NaOH

4. Use coefficients to balance the following reaction: __Na 2 CO 3 + __HNO 3  __H 2 O + __CO 2 + __NaNO 3 __Na 2 CO 3 + _2_HNO 3  __H 2 O + __CO 2 + _2_NaNO 3

5. Use coefficients to balance the following reaction: __IBr + __NH 3  __NI 3 + __NH 4 Br _3_IBr + _4_NH 3  __NI 3 + _3_NH 4 Br

6. Use coefficients to balance the following reaction: ___ NaBr +___ Ca(OH) 2  ___ CaBr 2 + ___ NaOH _2_ NaBr +__ Ca(OH) 2  __ CaBr 2 + _2_ NaOH

7. Use coefficients to balance the following reaction: ___ P + ___ O 2  ___ P 4 O 10 _4_ P + __5_ O 2  ___ P 4 O 10

8. Use coefficients to balance the following reaction: __Fe(OH) 3 + __ H 2 SO 4  __ Fe 2 (SO 4 ) 3 + __H 2 O 2_Fe(OH) 3 + _3_ H 2 SO 4  __ Fe 2 (SO 4 ) 3 + _6_H 2 O

9. Use coefficients to balance the following reaction: ___ Cu(OH) 2  ___ CuO+ ___ H 2 O ___ Cu(OH) 2  ___ CuO+ ___ H 2 O (already balanced)

10. Use coefficients to balance the following reaction: ___ Al 2 O 3 + heat  ___ O 2 + ___ Al __2_ Al 2 O 3 + heat  __3_ O 2 + _4_ Al