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Q of the Day

Q of the Day. Day 5 5-16. 1. Which type of reaction usually requires energy input?. Types of Chemical Equations. Single-Replacement Reactions. Single-replacement reaction OR displacement reaction – one element replaces a similar element in a compound. A + BX AX + B.

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Q of the Day

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  1. Q of the Day Day 5 5-16 1. Which type of reaction usually requires energy input?

  2. Types of Chemical Equations Single-Replacement Reactions Single-replacement reaction OR displacement reaction – one element replaces a similar element in a compound. A + BX AX + B Y + BX BY + X A, B, X, and Y = eles.; AX, BX, and BY = cmpds. Example: Fe(s) + CuSO4(aq) FeSO4(aq) + Cu(s) A BX AX B

  3. Types of Chemical Equations Single-replacement Reactions • Examples: • a metal with another metal • H in water with a metal • H in an acid with a metal • Halogens ***

  4. Types of Chemical Equations Single-replacement Reactions Single replacement reactions always have ... 2 reactants and 2 products 1 of each is an element

  5. Types of Chemical Equations Double-replacement Reactions Double-replacement reactions – the ions of 2 cmpds. exchange places in an aqueous sltn. to form 2 new cmpds. AX + BY AY + BX - - + - + - + + A, B, X, and Y = ions Example: 2KI(aq) + Pb(NO3)2(aq) PbI2(s) + 2KNO3(aq) AX BY BX AY

  6. Types of Chemical Equations Double-replacement Reactions Double replacement reactions always have ... 2 reactants and 2 products - all compounds In the margin: double reps. can form precipitates most acid-base reactions

  7. Practice What type of reaction is: AX + BY → AY + BX compound compound compound compound

  8. Practice What type of reaction is: X + BY → Y + BX element element compound compound

  9. Practice What type of reaction is: X + BY → BYX element compound compound

  10. Practice What type of reaction is: X + Y → XY element compound element

  11. Practice What type of reaction is: X + BY → Y + BX element element compound compound

  12. Practice What type of reaction is: BY → Y + B element compound element

  13. Balancing Practice: Balance: C2H2(g) + O2(g) CO2(g) + H2O(g) Balance: CuCl2 + Al  AlCl3 + Cu

  14. Go to wiki and click links – shssci.wikispaces.com: http://education.jlab.org/elementbalancing/index.html- 15 tries http://www.files.chem.vt.edu/RVGS/ACT/notes/scripts/bal_eq1.html http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm - bonus

  15. Q of the Day Day 6 5-19 1. Balance: C4H8(g) + O2(g) CO2(g) + H2O(g) • When sodium reacts w/ chlorine to produce sodium chloride, what type of reaction takes place?

  16. POE

  17. Predict: H2(g) + O2(g) # 1 Observe: Explanation: Balanced chemical equation =

  18. Predict: Al(s) + CuCl2(aq) # 2 Observe: Explanation: Balanced chemical equation =

  19. Predict: KI(aq) + Pb(NO3)2(aq) # 3 Observe: Explanation: Balanced chemical equation =

  20. Quick Talk Single replacement reaction Products Coefficients Conservation of matter Mg3(PO4)2 Diatomic gas Synthesis reaction Chemical reaction Reactants Decomposition reaction

  21. Example # 2: 2H2SO3(aq) + O2(g) 2H2SO4(aq) A B AB Example # 3: CaO(s) + SO2(g) CaSO3(s) A B AB A + B AB Example # 1: 2H2(g) + O2(g) 2H2O(g) A B AB

  22. Example: 2H2O(l) 2H2(g) + O2(g) electricity AB A B AB A + B

  23. A + BX AX + B Y + BX BY + X Example: Fe(s) + CuSO4(aq) FeSO4(aq) + Cu(s) A BX AX B AX + BY AY + BX - - + - + - + + Example: 2KI(aq) + Pb(NO3)2(aq) PbI2(s) + 2KNO3(aq) AX BY BX AY

  24. Objective / Essential Question Day 2 4-30 How does the Law of Conservation of Matter apply to chemical reactions? How do substances react to form products?

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