240 likes | 324 Views
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.
E N D
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 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
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 ***
Types of Chemical Equations Single-replacement Reactions Single replacement reactions always have ... 2 reactants and 2 products 1 of each is an element
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
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
Practice What type of reaction is: AX + BY → AY + BX compound compound compound compound
Practice What type of reaction is: X + BY → Y + BX element element compound compound
Practice What type of reaction is: X + BY → BYX element compound compound
Practice What type of reaction is: X + Y → XY element compound element
Practice What type of reaction is: X + BY → Y + BX element element compound compound
Practice What type of reaction is: BY → Y + B element compound element
Balancing Practice: Balance: C2H2(g) + O2(g) CO2(g) + H2O(g) Balance: CuCl2 + Al AlCl3 + Cu
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
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?
Predict: H2(g) + O2(g) # 1 Observe: Explanation: Balanced chemical equation =
Predict: Al(s) + CuCl2(aq) # 2 Observe: Explanation: Balanced chemical equation =
Predict: KI(aq) + Pb(NO3)2(aq) # 3 Observe: Explanation: Balanced chemical equation =
Quick Talk Single replacement reaction Products Coefficients Conservation of matter Mg3(PO4)2 Diatomic gas Synthesis reaction Chemical reaction Reactants Decomposition reaction
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
Example: 2H2O(l) 2H2(g) + O2(g) electricity AB A B AB A + B
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
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?