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C4 Stoichiometry

Vocabulary

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What are the chemical symbols for the following?

  1. Carbon
  2. Oxygen
  3. Hydrogen
  4. Calcium
  5. Helium
  6. Iron
  7. Sodium
  8. Potassium

​

What are the elements with these symbols?

  1. F
  2. S
  3. N
  4. Cl
  5. Mg
  6. Pb
  7. Au
  8. Zn

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C4 Stoichiometry

3.4.1 Use the symbols of the elements and write the formulae of simple compounds

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Challenge: Can you think of the symbols for these elements?

  1. Gyoxne
  2. Liehum
  3. Barcon
  4. Hitmiul
  5. Nori

6. Calmuic

7. Hodrygen

8. Nobor

9. Miodus

10. Linechor

  1. Oyxgen
  2. Helium
  3. Carbon
  4. Lithium
  5. Iron

6. Calcium

7. Hydrogen

8. Boron

9. Sodium

10. Chlorine

C4 Stoichiometry

On your whiteboards unscramble the element word

3.4.1 Use the symbols of the elements and write the formulae of simple compounds

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  • Cation = Positively Charged atom
  • Anion = Negatively charged atom

What is an anion and cation?

Challenge: How are they formed?

C4 Stoichiometry

Review C3.4.1 Describe the formation of ions by electron loss or gain

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C4 Stoichiometry

C3.4.7 Construct and use symbol equations, with state symbols, including ionic equations

State Symbol

Meaning

(s)

Solid

(l)

Liquid

(g)

Gas

(aq)

Aqueous (dissolved in water)

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C4 Stoichiometry

Most elements in group 5,6 and 7 like to form diatomic molecules

3.4.1 Use the symbols of the elements and write the formulae of simple compounds

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  • C4.1Use the symbols of the elements and write the formulae of simple compounds
  • C4.3 Deduce the formula of a simple compound from the relative numbers of atoms present
  • C4.4 Deduce the formula of a simple compound from a model or a diagrammatic representation
  • C4.5 Construct and use word equations

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C4 Stoichiometry

Learning Objectives

3.4.1 Use the symbols of the elements and write the formulae of simple compounds

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C4 Stoichiometry

What are the products for these 5 reactions?

C4.5 Construct and use word equations

  1. Iron (III) + Oxygen
  2. Copper + Chlorine
  3. Calcium + Oxygen
  4. Potassium + Fluorine
  5. Calcium + Nitrogen

​

​

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Sodium + Chlorine 🡪 Sodium Chloride

Na + Cl2 🡪 NaCl

Na+ and Cl- --> NaCl

2Na + Cl2 🡪 2NaCl

(s) + (g) 🡪 (s)

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C4 Stoichiometry

C4.1-4.5 Use the symbols of the elements and write the formulae of simple compounds

  1. Finish the word equation
  2. Write the symbols for each
  3. Draw the electron configuration
  4. Write the ions for each
  5. Write the chemical equation
  6. Balance the chemical equation
  7. Write the states symbols for each

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Magnesium + Oxygen 🡪 Magnesium Oxide

Mg + O

Mg2+ and O2- --> MgO

2Mg + 02 🡪 MgO

C4 Stoichiometry

C4.1-4.5 Use the symbols of the elements and write the formulae of simple compounds

  1. Finish the word equation
  2. Write the symbols for each
  3. Draw the electron configuration
  4. Write the ions for each
  5. Write the chemical equation
  6. Balance the chemical equation
  7. Write the states symbols for each

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Aluminum + Oxygen🡪 Aluminum Oxide

Al + O

Al3+ + O2- 🡪 Al2O3

2Al + 3O2 🡪 2Al2O3�

C4 Stoichiometry

C4.1-4.5 Use the symbols of the elements and write the formulae of simple compounds

  1. Finish the word equation
  2. Write the symbols for each
  3. Draw the electron configuration
  4. Write the ions for each
  5. Write the chemical equation
  6. Balance the chemical equation
  7. Write the states symbols for each

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C4 Stoichiometry

C4.1-4.5 Use the symbols of the elements and write the formulae of simple compounds

Iron (III) + Oxygen

Fe3+ + O2-

Copper + Chlorine

Cu2+ + Cl2-

Calcium + Oxygen

Ca2+ + O2-

Potassium + Fluorine

K+ + F-

Calcium + Nitrogen

Ca2+ + N3-

​

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Fe + CuSO4 

Fe + CuSO4 → FeSO4 + Cu

Fe(s) + CuSO4(aq) → FeSO4(aq)+ Cu(s)

C4 Stoichiometry

S042-

Fe2+

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Metal ion

Formula

Silver(I)

Ag+

Copper(II)

Cu2+

Lead(II)

Pb2+

Iron(II)

Fe2+

Iron(III)

Fe3+

C4 Stoichiometry

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Cations (positively charged)

Anions (negatively charged)

Ammonium NH4+

Hydroxide OH-

​

Nitrate NO3-

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Carbonate CO32-

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Sulfate SO42-

C4 Stoichiometry

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  1. The elements and compounds are put in place.
  2. Count the number of each element type on each side.
  3. Add numbers to the front of elements and compounds to make the same number of elements on each side. (balance whatever is by itself last).

Mg

O2

MgO

+

🡪

Reactants

Products

Mg = 1

O = 2

Mg = 1

O = 1

2

2

2

2

2

C4 Stoichiometry

C4.6 Interpret and balance simple symbol equations

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H2

O2

H2O

+

🡪

Reactants

Products

H = 2

O = 2

H = 2

O = 1

2

4

4

2

2

  • NO

O3

NO3

+

🡪

Reactants

Products

N = 1

O = 4

N = 1

O = 5

8

2

2

2

2

+

O2

5

2

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C4 Stoichiometry

Now you try two: balance the following equation

C4.6 Interpret and balance simple symbol equations

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�Hydrogen gas (H2) and nitrogen gas (N2) combine to form ammonium (NH3)

  • Hydrogen + Nitrogen 🡪 Ammonium

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  • 3H2 + N2 🡪 2NH3

C4 Stoichiometry

Write the word equation then the balanced equation of the following:

C4.6 Interpret and balance simple symbol equations

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C4 Stoichiometry

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C4 Stoichiometry

Checkpoint

https://forms.office.com/Pages/ResponsePage.aspx?id=KheSDBwaEUybg3pLxZlckfCWKUWRx4FArTzFC0TbyRFUMDBLUVFNWkU5RVkyV1A3WDMxVVNTSzdCTC4u

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