1. Chemical Equations EQ: What are the reactants and products of a chemical reaction? SPI 0807.9.10

2. What’s a Chemical Reaction? Chemical Reaction process of a substance completely changing to a different substance with different properties.

3. Equations are made up of chemical symbols and formulas. Chemical Symbol Shorter way to write an element’s name. Examples: – H: Hydrogen – O: Oxygen – Fe: Iron

4. Chemical Formula combination of chemical symbols and numbers to represent a substance. It an easier way to write a molecules and compounds. Examples: – H 2 0: Water – CO 2 : Carbon Dioxide

6. Subscript Subscript the small # to the right of the element that tells the # of atoms Applies to only the element directly before it!

7. Examples of subscripts: –H2O–H2O – SO 4 – Ca(OH) 2

8. How many atoms of each?? 1. CO 2 2. H 2 0 3. NaClF 4

9. Coefficients Coefficients large # to the left of the element. Applies to the whole molecule!

10. Examples of coefficients: – 2H 2 O – 4SO 4 – 3Ca(OH) 2

11. How many atoms of each?? 1. 4 NaCl 2. 6 CO 2 3. 2 H 2 O

12. What are reactants and products in a chemical equation?? Reactants what you start with Products what you end with

13. CH 4 + O 2 → CO 2 + H 2 O Circle the REACTANTS Underline the PRODUCTS

15. 1.P 2 O 5 2.4Na(ClO) 3 How many atoms of each element are there?

16. CH 4 + O 2 → CO 2 + H 2 O

17. The Law of Conservation of Mass EQ: What is the Law of Conservation of Mass? SPI 0807.9.11

18. The Law of Conservation of Mass Law of conservation of Mass states that mass cannot be created or destroyed! 4Na + 2Cl 2  4NaCl

19. This is important when we balance equations… An equation is balanced when the # of atoms in the reactants are = to the # of atoms in the products.

20. How many atoms of each element? Na + Cl 2  2NaCl

21. 6 CO 2 + 6 H 2 O  C 6 H 12 0 6 + 6 O 2 Is this a balanced equation?

22. Is this a “balanced” equation?

23. You balance an equation by changing the coefficients, not the subscript!

24. Balance this equation. ___ Mg + ___ O 2 ___ MgO

25. Balance the equation. ___ H 2 O 2 ___H 2 O + ___ O 2

26. __ Fe + __S → __FeS

27. __H 2 + __O 2 → __H 2 O

28. __Mg + __O 2 → __MgO

29. _Ca + _H 2 O → _Ca(OH) 2 + _H 2

30. ___ NH 4 NO 3  ___ N 2 O + ___ H 2 O

31. ___BKClO 3  ___BKCl + ___BO 2

32. ___ C 3 H 8 + ___O 2  ___ CO 2 + ___ H 2 O

33. __ Al 2 O 3 + __ Fe  __ Fe 3 O 4 + __ Al

34. ___ P 4 O 10 + ___H 2 O  ___H 3 PO 4

35. __Al + __H 2 SO 4  __Al 2 (SO 4 ) 3 + __H 2

36. __Be 2 C + __H 2 O  __Be(OH) 2 + __CH 4

37. ___ Fe + ___ O  ___ Fe 2 O 3

38. __S + __HNO 3  __H 2 SO 4 + __NO 2 + __H 2 O

39. __NH 3 + __CuO  __Cu + __N 2 + __H 2 O

40. __Cu + __HNO 3  __Cu(NO 3 ) 2 + __NO + __H 2 O

41. Al 2 (SO 3 ) 3 + NaOH  Na 2 SO 3 + Al(OH) 3