Reflection: Safety Conservation of Mass Lab - Section 5: Elaborate (homework)

 

As most science teachers are aware safety is the number one concern in the class, especially when a lab is being conducted.  This lab is no exception.  I chose this lab over the "traditional" baking soda and vinegar conservation of mass lab because it provided student with a real world look at how chemical reactions occur around us on a daily basis in the form of rust.  And just because something appears physically and chemically different, mass is still conserved during a chemical reaction.  

I would have like to made this lab more visually noticeable (increase in gas production) by using a stronger concentrated acid, such as 6 M sulfuric acid. By doing this students would see more product made and therefore a greater mass difference between reactants and products in trial A when gas was released into the air.  In addition, in trial B the greater mass of the gas would inflate the balloon more.  

In my mind the payoff for better results was not worth the potential safety issues that might occur when students try putting the balloon on the flask.  I have see in the past that the potential for tipping the flask can occur when students attempt to affix the balloon to the flask and with a stronger acid the potential for an burn is greatly increased.    

Using a lower concentration acid can lead to a discussion about lab safety and how results can sometimes be hard to measure.  This can also lead into a conversation about using classroom data to gather more reliable data.  

  Lab Safety
  Safety: Lab Safety
Loading resource...
 

Conservation of Mass Lab

Unit 3: Unit 5 Chemical Reactions
Lesson 6 of 13

Objective: SWBAT model, identify and balance chemical reactions demonstrating the Law of Conservation of Mass.

Big Idea: Students conduct an investigation that shows mass is conserved during the chemical reaction between sulfuric acid and steel wool (iron).

  Print Lesson
4 teachers like this lesson
rusted bridge
 
1
2
3
4
5
Similar Lessons
 
Balancing Chemical Equations
High School Chemistry » Stoichiometry
Big Idea: Atoms are not destroyed or created in chemical reactions; they are rearranged. This means that a reaction must have the same amount of atoms of each element on both sides of a chemical equation.
  Favorites(3)
  Resources(16)
Westhampton, MA
Environment: Suburban
Keith  Wright
 
Chemical Reaction Equations--An Introduction
High School Chemistry » Chemical Reactions and Stoichiometry
Big Idea: Starting materials in scientific processes are called "reactants" and "products" are the result; reactants that run out limit the amount of product made, leftovers are called excess.
  Favorites(14)
  Resources(15)
Los Angeles, CA
Environment: Urban
Emilie Hill
 
Mole and Molar Mass
High School Chemistry » Unit 2: Matter, Atoms, and the Periodic Table
Big Idea: The mole is a quantity that allows chemists to convert from the atomic scale to macroscopic scale.
  Favorites(8)
  Resources(34)
Chula Vista, CA
Environment: Urban
Rachel Meisner
 
Something went wrong. See details for more info
Nothing to upload
details
close