Post on 05-Jan-2016
transcript
Solid calcium reacts with liquid water to produce aqueous calcium hydroxide and hydrogen gas:
a. write a balanced chemical equation for the reaction (you may need your blue ion sheet).
Q Of The DayDay 3
5-14
Ca(s) + 2H2O(l) Ca(OH)2(aq) + H2(g)
Solid magnesium reacts with fluorine gas to produce solid magnesium fluoride.
Equation:
Build:
Balancing Equations
Chemicals equations are not always balanced, sometimes we will have to balance them …
1. Balance different types of atoms one at a time
2. Start with atoms that appear only once on each side
Notes page 3
1. Balance different types of atoms one at a time
2. Start with atoms that appear only once on each side
3. Balance polyatomic ions that appear on both sides of the equation as a single unit
4. Balance H and O atoms last
Balancing Equations
If it’s not working…1. Deep breathe
2. Check your chemical formulas
3. NEVER change subscripts this changes the compounds!!!
4. It’s ok to start over if you get frustrated
Balancing Equations
Balancing Equations
F2(g) + K(s) KF(s)
Al(s) + O2(g) Al2O3(s)
Balancing Equations
Na + Mg3(PO4)2 → Mg + Na3PO4 Polyatomic Example:
C6H14 + O2 CO2 + H2O
C
O
H
C
O
H
6
2
14 2
3
1
C’s First
6
12
13
O’s Second
142 19
26
2828
38
12 12
38
6
Balancing Equations
Notes page 4
Read pages 346-349, define chemical equation and skeleton equation, AND complete #s 1 and 2 on page 349.
ADD: Review section 11.1 and complete #s 7-11 (for #s 9 and 11 complete part a only) on page 354
Assignment – hand in NOW
Balance the following:
Q Of The DayDay 4
5-15
Mg(s) + H3PO4(aq) Mg3(PO4)2(aq) + H2(g)2 33
3. Write a balanced chemical equation describing the reaction between Magnesium Hydroxide and HF to produce MgF2 and water.
1. Formula: Magnesium Hydroxide?
2. Name for: HF and MgF2?
Day 4 5-15
Day 4 5-15
balance the following rxn:
C3H8 + O2 CO2 + H2O
Q Of The DayDay 5
5-18
http://education.jlab.org/elementbalancing/index.html (10 questions at beginner and 10 at intermediate in 15 tries each)
http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm - bonus
Go to wiki and click links – shssci.wikispaces.com:
C6H14 + O2 CO2 + H2O
C
O
H
C
O
H
6
2
14 2
3
1
C’s First
6
12
13
O’s Second
142 19
26
2828
38
12 12
38
6
ATB – Complete in the notes!!!
Notes page 4
Day 6 5-19
http://education.jlab.org/elementbalancing/index.html (10 questions at beginner and 10 at intermediate in 15 tries each)
http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm - bonus
Go to wiki and click links – shssci.wikispaces.com:
Balance:
C4H10(g) + O2(g) CO2(g) + H2O(g)
Balance:
H2SO3 + Mg(OH)2 MgSO3 + H2O
Day 1 5-20
Types of Chemical Reactions
Synthesis reaction – composition reaction – 2 or more substances combine to form a new compound
A + B AB
A and B = eles. Or cmpds.
AB = cmpd.
Example # 1: 2H2(g) + O2(g) 2H2O(g) A B AB
Synthesis Reactions
A and B = eles. Or cmpds.
AB = cmpd.
Example # 2: 2H2SO3(aq) + O2(g) 2H2SO4(aq)
A B AB
Example # 3: CaO(s) + SO2(g) CaSO3(s)
A B AB
Types of Chemical EquationsSynthesis Reactions
Types of Chemical EquationsSynthesis ReactionsExamples:
- an element reacts with oxygen to form an oxide
- most metals react with halogens to form cmpds.
- oxides of active metals react with water to produce metal hydroxides
- certain metal oxides and nonmetal oxides react to form salts
Types of Chemical EquationsSynthesis Reactions
Types of Chemical EquationsDecompostion Reactionsdecomposition reaction – single compound undergoes a reaction that produces 2 or more simpler subs. – usually require add. of energy (heat or electricity)
AB A + BA and B = eles. Or cmpds.
AB = cmpd.
Example: 2H2O(l) 2H2(g) + O2(g) AB A B
electricity
Types of Chemical EquationsDecompostion ReactionsExamples:
- electric current to a binary compound producing its elements
- heating the oxides of less active metals
- Metal carbonates produce metal oxide + CO2
Types of Chemical EquationsDecompostion Reactions
Electrolysis –
decpomposition of
a substance by an
electrical current
Types of Chemical EquationsDecompostion Reactions