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

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

Law of Conservation of Mass AGENDA Important Date Law of Conservation of Mass

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

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

TRIPLE BEAM BALANCE

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

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.

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.

QUESTIONS Answer questions 4-6 related to the TBB

GRADUATED CYLINDER

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?

GRADUATED CYLINDER READING

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

USING THE INSTRUMENTS

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

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

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

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

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

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