1. Chemical Reactions

2. What do the letters and numbers mean?
The letters are the element symbols
The numbers tell how many of that element are present.

3. MnO4
Ca3N2
LiC2H3O2
Al3S2

4. What if there are parentheses?
They show you have a polyatomic ion
The little number multiplies to everything inside of the ( ).
Ca(OH)2 = 1 Ca, 2 O and 2 H

5. Cr(C2H3O2)4
Al2(SO4)3
(NH4)3PO4

6. What is a chemical reaction?
It is the same as a chemical change.

7. What are the two parts to chemical reactions?
The reactants and the products

8. What are reactants?
It is what you begin with.

9. What are products?
It is your final result.

10. What were the ways we knew a chemical reaction occurred?
Creates light or sound
Change in temperature
Changes color
Creates an odor
Creates a precipitate
Bubbles/creates a gas

11. What is a precipitate?
A solid product from a chemical reaction,

12. Reading chemical reactions, what are some symbols I may see?
+ means reacts with or and
 means produces or forms
(s) is a solid
(l) is a liquid
(g) is a gas
(aq) is aqueous

13. H2(g)
H2O(l)
NaCl(s)
NaCl(aq)

14. What does aqueous mean?
It means dissolved in water

15. When a chemical reaction is done, is anything lost or gained?
No, all chemical reactions follow the law of conservation of mass.

16. What is the law of conservation of mass?
Mass can never be created or destroyed

17. What does it mean?
What ever mass you begin with in a reaction, you will end with the same mass.

18. How do we show that we are following the law of conservation of mass?
We balance chemical reactions.

19. What do we use to balance chemical reactions?
Coefficients- numbers in front of the compounds
2 H2O is H2O
H2O

20. What does balancing do?
Make sure you have the same number of each element on both sides of the reaction.

21. What are some hints to balancing?
Make an inventory
Keep polyatomic ions together, if they are on both sides
Save hydrogen and oxygen for last.
Use pencil

22. ___V2O5 + ___CaS  ___CaO + ___V2S5

23. ___NaNO3 + ___PbO  ___ Pb(NO3)2 +___Na2O

24. ___H2SO4 +___ Al(OH)3___Al2(SO4)3+___ H2O

25. What are the 5 types of chemical reactions?
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion

26. What is a synthesis reaction?
A reaction in which ONE compound is a product.
A + B  AB

27. Sally
Joey + 

28. What is a decomposition reaction?
A reaction in which your ONE product breaks down.
AB  A + B

29.  +
Billy
Betty

30. What is a single replacement reaction?
Where an element replaces one component of a compound to form another compound and an element.
AB + X  AX + B

31. Sally + +

32. What is a double replacement reaction?
You will see 2 compounds as reactants and as products. They just trade what they are paired up with.

33. + +

34. What is a combustion reaction?
A compound reacts with oxygen. The two products are always CO2 and H2O.
AB + O2  CO2 + H2O

35. Is there a way to predict the state of matter of the products?
Yes, use a chart

37. On the chart, what does soluble mean?
It is an aqueous (aq) compound

39. What does insoluble mean?
It is a solid (s) precipitate

41. What if it is an exception?
It is the other type of compound.

43. Examples
Ca(HCO3)2
LiNO3
Na3P
CaCO3
CaCrO4
FeS
Ba(OH)2
SrO