Pre-laboratory question balance each of the following equations, and classify each of the reactions by type. reaction equation type of reaction 1. kclo3 → kcl + o2 2. na + o2 → na2o2 3. ki + pb(no3)2 → kno3 + pbi2 4. cu + agno3 → cu(no3)2 + ag 5. c3h8 + o2 → co2 + h2o + heat 6. zn + hcl → zncl2 + h2

1) 2 KClO₃ → 2 KCl + 3 O₂ decomposition

2) 2 Na + O₂ → Na₂O₂ direct combination

3) 2 KI + Pb(NO₃)₂ → 2 KNO₃ + PbI₂ double displacement

4) Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag single displacement

5) C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O + heat  combustion

6) Zn + 2HCl → ZnCl₂ + H₂ single displacement

decomposition reaction -  when you heat a compound (for a certain amount of time and temperature) it will transform in simpler substances

direct combination - simpler elements will react to each other to form a chemical compound

double replacement - it is a reaction of the following type

AB + CD →  AC + BD

single replacement - it is a reaction of the following type

A + BC →  B + AC

combustion - when substances (usually organic compounds like hydrocarbons) react with oxygen forming oxides and heat

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

3 1/4 %

explanation: