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