Transcript Reaction In A Bag

Reaction In A Bag
Objective
• The student will be able to analyze a chemical
reaction in order to explain the law of
conservation of matter.
Recall the Law of Conservation of
Matter (or Mass)
• The Law of Conservation of Matter states that
during a chemical reaction, matter is neither
created nor destroyed.
• In other words, the total amount of matter
before and after a chemical reaction stays the
same.
SILENTLY read the procedure.
• What is the purpose of this lab?
• Why is it necessary to make sure the bag is
sealed tightly?
• In step I, it says to mass the rubber band with
the bag, why?
Today we will be doing the
following chemical reaction:
•2NaHCO3 + CaCl2 ----->
CaCO3 + 2NaCl + H2O
+ CO2
Answer the following question on
page 21:
• Based on what the Law of Conservation of
Matter states, what do you think will happen
to the mass after the chemical reaction
between baking soda and calcium chloride
occurs? (Will it increase, decrease or stay the
same?) Explain your answer.
On Page 22 of your notebook, draw
the following chart and title it
“Reaction in a Bag Data”
Mass of Materials
before reaction
Mass of Materials
after reaction
Do the investigation
Clean-up Procedure
• Give the Ziploc bag to Mr. Hong.
• Make sure your station is neat
and clean.
• Stack the goggles.
• Take your seat.
Read
• Conserving the Matter
• Complete “Life in a Jar Reflections 3”
• Paste the “Reaction in a Bag analysis” on
page 21.
• Paste the reading “Conserving Matter”
on page 20
• Paste “Life in a Jar Reflections 3” on page
23
Can you do an experiment with
seltzer tablet and water to test the
Law of conservation of matter?
• How will you keep the tablet from reacting
with the water before you are ready?
• Does it matter how much water that you use?