1. Count the atoms for the following compounds.
BELL WORK:
Count the atoms for the following compounds.
CA2OH
2CaC2OH
3Ca(C2OH)3 4 10 39

2. Preparing for TCAP… SPI 0807.9.1
The 3 subatomic particles that make up atoms are __________, __________, and __________.
protons
neutrons
electrons
SPI …TRUE or FALSE
Bonds do not have to be broken to form compounds.
SPI
The atomic mass number tells you how many protons and __________ are in an atom.
neutrons

3. Law of Conservation of Mass
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Atoms are never lost or gained in a chemical reaction…they are just rearranged.
The total mass of the reactants will be equal to the total mass of the products.
The starting materials in a reaction are called reactants.
The substances formed from a reaction are called products.

4. Law of Conservation of Mass
Reactants
Products
4P + 5O P4O10
Coefficient
Yield Sign
Subscript
If you have 14 atoms on the left side, you have to have 14 atoms on the right side!

5. Today’s lab…you will work as a group.
Step 1: Place a baggie on the triple-beam balance. Step 2: Add baking soda to the baggie until you get a measurement of 7 grams. Step 3: Using the funnel (or dropper) and graduated cylinder, measure out 7 mL of vinegar. Step 4: Place the 7 mL of vinegar into the canister. Step 5: Put the lid on the canister. Step 6: Carefully place the canister into the baggie. Be sure to squeeze the air out of the baggie. Seal the bag…make sure it is sealed. Step 7: Measure the mass of the baggie and its contents all together. Record your measurements. Step 8: Send one member of your group to the front to record your measurements.

6. Today’s lab…you will work as a group.
Step 9: Keeping the bag closed at all times, open the canister in the bag. Mix the vinegar with the baking soda. Record your observations. Step 10: When the reaction has stopped, measure the mass of the baggie and its contents. Record your measurement. Step 11: Send one member of your group to the front to record your measurements. Step 12: Compare the mass of the materials before the reaction and the mass of the materials after the reaction.
Clean Up…
Set the triple-beam balance to zero.
Rinse out the canister.
Throw away your baggie.
Clean up your area.
Push in your stool and return to your seat.

7. Notice: No new elements were introduced.
Our experiment…
NaHCO3 + CH3COOH NaOOCCH3 + H2O + CO2
Baking Soda
Vinegar
Sodium Acetate
Water
Carbon dioxide
Reactants
Products
Notice: No new elements were introduced.
On the left…Na, H, C, O
On the right…Na, H, C, O