science Conservation of matter - Equation balance

Conservation of Matterand

Balancing the EquationPeking

Oxygen

O O

Hydrogen

H H

Oxygen

O OWhat type of bond does O2 have?

Oxygen

O OWhat type of bond does O2 have?

Two, it is double bonded

Hydrogen

H HWhat type of bond does H2

have?

Hydrogen

H HWhat type of bond does H2

have?One, it is single bonded

Gas: Oxygen and Hydrogen

• How many oxygen atoms do you see?


• How many oxygen atoms do you see?

Two


• How many oxygen molecules do you see?


• How many oxygen molecules do you see?

ONE


• How many hydrogen atoms do you see?


• How many hydrogen atoms do you see?

Four


• How many hydrogen molecules do you see?

Two

O2 +2H22H2O

O OH H H H

Balancing the EquationBalancing the Equation

O2 +2H22H2O

O OH H H H

O2 +2H22H2O

O OH H H H

Conservation of MatterConservation of Matter

O2 +2H22H2O


reactant

Subscript

O2 +2H22H2O


reactant

Subscript

Tells us how many of the element

O2 +2H22H2O


reactant

What is this?What is this?

Tells us how many of the element

O2 +2H22H2O


reactant

Subscript

What does it tell us?What does it tell us?

O2 +2H22H2O


reactant

Subscript

Tells us how many of the elementTells us how many of the element

O2 +2H22H2O


reactant

Refers to the HydrogenRefers to the Hydrogen

O2 +2H22H2O


reactant

Refers to the MOLECULERefers to the MOLECULE

O2 +2H22H2O


reactant

(2x2=4) (2x2=4)

4 hydrogens4 hydrogens

O2 +2H22H2O


reactant(2x2=4) (2x2=4)

4 hydrogens 2 oxygensThis molecule


O2 +2H22H2O


(2x2=4) (2x2=4)



Questions- Answer now

1. The valence electron of Oxygen, and how many does it need to be stable?

2. The valence electron of carbon, and how many does it need to be stable?

3. With how many elements can oxygen react?4. With how many elements can hydrogen react?5. With how many elements can carbon react?

• With how many elements can oxygen react?• 4.With how many elements can hydrogen

react?

• 5.With how many elements can carbon react?• 6. CO2 – How many oxygen atoms?

• 7. CO2 – How many Carbon atoms?

Questions- Answer now

6. CO2 – How many oxygen atoms?

7. CO2 – How many Carbon atoms?

8. NaCl – How many chlorine atoms?

9. 4CO2 – How many oxygen atoms?

10. 4CO2 – How many Molecules?

11. What have you learned

Word Wise

• The root equ- means “even” or “equal”.

– Balanced– The same

Word Wise- It’s wise to know them

Vocabulary - chemical formula - chemical equation - reactant - product - law of conservation of mass

•Page 262-64

chemical formula• All substances are formed from ~ 100

elements– All substances = Everything

• Shorthand way to represent a substance.

chemical formula• All substances are formed from ~ 100

elements– All substances = Everything

• Shorthand way to represent a substance.• Todas las sustancias se forman a partir de ~ 100

elementos • Todas las sustancias = Todo

chemical formula• How many carbons in sugar? ¿Cuántos átomos de

carbono en el azúcar?

– Hydrogens?– Oxygens?

COEFFICIENT

5C6H12O6

COEFFICIENT

COEFFICIENT

5C6H12O6

COEFFICIENT

coefficient is a number that is placed in front of a chemical symbol or formula

chemical formula• How many carbons in sugar?

–Hydrogens?–Oxygens?

5C6H12O6

Come back to naming page 263

chemical formula• How many carbons in sugar?

– Hydrogens?– Oxygens?

5C6H12O6

C = 30H = 60O= 30

Come back to naming page 263

COEFFICIENT

If you see 4O2 in an equation, what is the coefficient?

How many oxygen molecules?

How many oxygen atoms?

More parts of a chemical equation

The formulas of the reactants are written before the arrow .


• The formulas of the reactants are written before the arrow .

+ the two formulas are going to

combine


• Product written after the arrow.

Reactants Product

Which is Product?Which are Reactants?

• Plus sign =– the reactants are added together.

• The arrow points to the products.

A Balanced Equation

NaHCO3 + CH3COOH → CO2 + H2O + Na+ + CH3COO-

A Balanced Equation


• How many Na on reactant side?• How many H on reactant side?• How many C on reactant side?• How many O on reactant side?

A Balanced Equation


5. How many Na on product side?6. How many H on product side?7. How many C on product side?8. How many O on product side?

Explain if you think the Equation is Balanced


Baking soda + Vinegar

NaHCO3 + CH3COOH →

Baking soda + Vinegar

NaHCO3 + CH3COOH →Na= with how many atoms may it

react?H= with how many atoms may it react?C= with how many atoms may it react?

O= with how many atoms may it react?

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