Pre-Lab Study Questions 10 PDF

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chapter 10 pre lab question answers for chem 106..................................................

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Pre-Lab Study Questions 10

1. Why are burning candles and rusting nails examples of a chemical change? Rusting is slow oxidation of iron into iron oxide using H2O and oxygen in the atmosphere which is a chemical reaction. However, burning is also an oxidation, but fast using oxygen in the atmosphere to oxidize the wax in the candle to give heat and CO2. So they are both chemical reactions which happens at different rate 2. What is included in a chemical equation? In the chemical equation Reactants and products are included. 3. How does a combination reaction differ from a decomposition reaction? In a combination reaction element combines to form a compound. In a decomposition compound comes apart. 4) 2Al + Fe2O3 ---> Al2O3 + 2Fe .. single replacement 2KClO3 ---> 2KCl + 3O2.. decomposition 2Li + Cl2 --> 2liCl... combination C2H4 +2 O2 ----2CO2 +2H2O ... combustion 2CrCl3 +3H2S --> Cr2S3 + 6HCl.. double replacement 5)

Balanced reaction given below

6K + N2 --> 2K3N C5H12 +8 O2 --> 5CO2(g) +6 H2O(g) 2Al + 3CuSO4 -->3 Cu(s) + Al2(SO4)3(aq) CoCl3 +3 AgNO3 --> Co(NO3)3(aq) +3 AgCl (aq) MgCO3---> MgO + CO2...