1. Q2: Identify each of the types of reactions below:
AB  A + B
AB + CD  AD + CB
A + B  AB
AB + C  AC + B
2Na + Cl2  2NaCl
CaCO3 + 2HCl  CaCl2 + H2CO3

3. Today’s First Objective:
I understand how the Law of Conservation of Mass affects chemical reactions.

4. Capturing a
Chemical Reaction

5. How does mass change during a chemical reaction?
Our Question:
How does mass change during a chemical reaction?

6. Research

7. Hypothesis: How does mass change during a chemical reaction?

8. Lab: What Happens to Mass in a Chemical Reaction?

9. Our Reactants:
C16H17NaO14
sodium acetylsalicylate -sodium bicarbonate - sodium citrate

10. And H2O
Dihydrogen monoxide
Aka water

11. Trisodium citrate and water
Our Products:
Na3C6H5O7
H2O
Trisodium citrate and water

12. Mass of antacid tablet: 3.1g
Mass of water & bag: g
Mass of antacid tablet: 3.1g
Total Mass before reaction:
104.3 g
Mass after bubbles stopped: g
Mass difference between
start and end: .3g

13. Law of Conservation of Mass:
Mass is neither created or destroyed during a chemical reaction.
What you start out with,
you must end up with.
Every atom present before reaction, must be accounted for after reaction.

14. Conservation of Mass Law
Reactants = Products

15. So How Can We Prove That?
Lavoisier

16. Summing Up the Reactions

17. States of matter are often indicated in parenthesis behind the compound.
(g) Is a gas
(s) Is a solid
(aq) or (l) Is a liquid
2 K(s) + Cl2(g) → 2 KCl(s)

18. How many atoms are involved in this reaction?
2 K(s) + Cl2(g) → 2 KCl(s)
K Potassium
Cl Chlorine 2

19. Today’s 2nd Objective:
I can use various ways to distinguish an acid from a base.

20. Electrolyte: Charged particle in a substance
Ion: H+ or OH-
More electrolytes: more conducting of electricity

21. Chemical and physical properties when dissolved in water
Acids:
Chemical and physical properties when dissolved in water

22. Reacts with metals to form hydrogen gas and a metal compound

23. Changes colors with an indicator
Sour tastes
Changes colors with an indicator

24. Produce a hydrogen ion H+ in H2O
Contains hydrogen
Produce a hydrogen ion H+ in H2O
Proton donor

25. Not all compounds with hydrogen are acids

26. Example: HCl Hydrochloric Acid Naming Acids: * Hydrogen donator
…so we know there is at least one H+
Possible suffixes
- ide
- ite
- ate
- ic
Example: HCl
Hydrochloric
Acid

27. The “Power of Hydrogen”
pH:
The “Power of Hydrogen”
How many H+ ions are
in the compound

28. pH is
between 1 and 7

29. Base: A compound containing a hydroxide ion
OH-

30. Not reactive with metals
Base
Bitter Taste
Slippery
Not reactive with metals

31. pH is
between 8 and 14