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CHAPTER 6 REVIEW. Page 252 Questions 1,4bcd,5,6. QUESTION 1. A) State the Law of Conservation of Mass. The total mass of atoms must always be the same on both sides of an equation . B) How does this law explain why we balance chemical equations?

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## CHAPTER 6 REVIEW

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**CHAPTER 6 REVIEW**Page 252 Questions 1,4bcd,5,6**QUESTION 1**A) State the Law of Conservation of Mass. The total mass of atoms must always be the same on both sides of an equation. B) How does this law explain why we balance chemical equations? We balance the atoms throughout the entire reaction from reactants to products.**Question 4**b) A piece of zinc metal added to silver nitrate produces zinc nitrate and silver. Zn + AgNO3 Zn(NO3)2 + Ag Balanced: Zn + 2AgNO3 Zn(NO3)2 + 2Ag c) When zinc carbonate is heated, zinc oxide and carbon dioxide are produced. ZnCO3 ZnO + CO2 Balanced: ZnCO3 ZnO + CO2 d) Nitrogen and oxygen gases react in automobile engines to produce poisonous nitrogen dioxide. N2 + O2 NO2 Balanced: N2 + 2O2 2NO2**QUESTION 5**Determine whether the following equations are balanced as written. Balance the equation if necessary. A) CO + O2 CO2 2CO + O2 2CO2 B) CI2 + KBr Br2 + KCI CI2 + 2KBr Br2 + 2KCI C) 4NH3 + 3O2 2N2 + 6H2O Balanced**QUESTION 6**Balance the following equations A) Ca + HBr CaBr2 + H2 Ca + 2HBr CaBr2 + H2 B) Al + O2 Al2O3 4Al + 3O2 2Al2O3 C) KNO3 + HBr KBr + HNO3 Balanced**QUESTION 6**D) Ba + H3PO4 Ba3(PO4)2 + H2 3Ba + 2H3PO4 Ba3(PO4)2 + 3H2 E) CaCl2 + Al2(SO4)3 CaSO4 + AlCl3 3CaCl2 + Al2(SO4)3 3CaSO4 + 2AlCl3 F) C3H8 + O2 CO2 + H2O C3H8 + 5O2 3CO2 + 4H2O

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