Particle Model And Balancing Equations Notes

Is used to show chemical reactions

Counting atoms in a molecule

NaCl				3 NaCl				Na2SO4			2 Na2SO4			

3 CuSO4			C5H11OH			3 C5H11OH			Ca3(PO4)2 

3 Ca3(PO4)2			Cu(NO3)2			2 Cu(NO3)2			3 NH4Cl

           Various symbols are used to show the molecules.
Na	2 Na	2 H2	H2SO4	
				
Cu(NO3)2	2 Cu(NO3)2	Ca3(PO4)2	3 Ca3(PO4)2	

4 Al	+	3 O2	⇒ 		2 Al2O3

Fe2O3    +	3 CO	⇒			2 Fe	+	3 CO2

HNO3	+	4 H2	⇒			NH3	+	3 H2O

Conservation of Matter

Matter is never created or destroyed, it is just changed.

Rules:

1­ The type of atoms stay constant before and after the reaction.

2­ The number of atoms stay constant before and after the reaction.

3­ The mass of the atoms stays the same before and after the reaction.

What is incorrect with the following equation? 
Al	+	O2	⇒	Al2O3

Balancing equations

1.	            4 P    +	  5 O2    →     P2O5

2.		H2      +     O2       →      H2O

3.		P    +    Cl2     →     PCl3

4.		P    +     O2    →    P2O5

5.		N2    +    O2     →     N2O5

6.		Fe2O3    +    3 CO  →     2 Fe   +     CO2

7.		2 KOH    +    H2SO4       →       K2SO4     +     H2O

8.		NH3    +     Cl2      →     HCl     +    N2

9.		NaOH     →     Na     +    O2     +    H2O

10.		FeS    +   O2     →       Fe2O3     +     SO2

11.		HCl    +    Fe     →     FeCl2       +     H2

12.		Na    +     H2O      →      NaOH      +     H2

13.		H2SO4     +   S    →     SO2     +     H2O

14.		C8H18        +    O2      →     CO2      +    H2O

15.		HNO3     +     H2     →     NH3     +    H2O

16.		FeCl3    +   NH4OH    →     Fe(OH)3     +     NH4Cl

17.		H2SO4    +    C     →    CO2     +     H2O   +    SO2

Mass of Equations

1.	You combined 80 g of 2 KOH with 100 g of H2SO4 to produce 120 g of K2SO4 and 2 H2O. How much water was produced?

2.	You combined 160 g of 2 H2 with O2 and produced 197 g of 2 H2O. How much O2 was produced?

3.	You combined 25 g of C3H8 with 5 O2 to produce 37 g of 3 CO2 and 30 g of 4 H2O. How much O2 was produced?