1. Law of Conservation of Mass
CHEMISTRY OCTOBER 6, 2014
Law of Conservation of Mass

2. OBJECTIVE SWBAT Define the Law of Conservation of Mass
Demonstrate the Law of Conservation of Mass

3. Law of Conservation of Mass
AGENDA
Important Date
Law of Conservation of Mass

4. IMPORTANT DATES Makeup Day Test Review - Wednesday Lab 03 – Thursday
Quiz 1, 2 and 3 Makeup
Lab 1 and 2 Makeup
Missing Homework
Test Review Worksheet
Test Review - Wednesday
Lab 03 – Thursday
Test 01 – Friday

5. Participation Champion
Period 1 - Autumn
Period 3 – Zachary and Eric
Period 5 - Vicente
Period 7 - Xianxiao
Period 8 – Anamaria, Cesar, Alyson

6. TRIPLE BEAM BALANCE

7. TRIPLE BEAM BALANCE The triple beam balance is used to measure mass
Calibrate before measurement

8. HOW TO USE THE TBB place the object to be measured on the pan
Move the 100 gram slider along the beam to the right until the indicator drops below the fixed mark. The notched position immediately to the left of this point indicates the number of hundreds of grams.
Now move the 10 gram slider along the beam to the right until the indicator drops below the fixed mark. The notched position immediately to the left of this point indicates the number of tens of grams.

9. HOW TO USE THE TBB (cont’)
The beam in front is not notched; the slider can move anywhere along the beam. The boldface numbers on this beam are grams and the tick marks between the boldface numbers indicate tenths of grams.
To find the mass of the object on the pan, simple add the numbers from the three beams.

10. QUESTIONS
Answer questions 4-6 related to the TBB

11. GRADUATED CYLINDER

12. GRADUATED CYLINDER The graduated cylinder is used to measure volume
Graduated cylinders come in various sizes.
Record yours
What is the maximum capacity of your graduated cylinder?
What is the smallest division of your cylinder?
How many decimal places should be included in reporting a measured volume?

13. GRADUATED CYLINDER READING

14. MENISCUS
Read the graduated cylinder by reading the meniscus (the lowest portion of the convex dip of the liquid)
Meniscus form because of adhesion force is stronger than cohesion force

15. USING THE INSTRUMENTS

16. QUALITATIVE OBSERVATIONS
Record your observations into the table for the rubber stopper, the cork stopper and the antacid
For this lab, you DO NOT taste any of the objects

17. QUANTITATIVE MEASUREMENTS
Record the quantitative measurements for the rubber stopper and the cork stopper and complete the table
Mass
Volume

18. DENSITY State the density formula
Perform the density calculation for both stoppers

19. LAW OF CONSERVATION OF MASS
The Law of Conservation of Mass states that in a chemical reaction, the mass of the product equals the mass of the reactants

20. Alka-Seltzer Perform the qualitative observations of the alka-seltzer
What happens to the mass when alka seltzer is placed into a sealed bag?

21. CLEAN UP CLEAN UP AROUND YOU LEAVE THE TRIPLE BEAM BALANCE AT THE DESK
DUMP OUT THE WATER INTO THE SINK FROM THE ZIP LOCK BAG AND THROW AWAY THE ZIP LOCK BAG
BRINK THE GRADUATED CYLINDERS, STOPPERS AND BEAKERS BACK TO THE LAB TAPLE AND SEPARATE INTO ITS INDIVIDUAL GROUPS