Lab 1 Procedure

The three parts to the exercise are:

  1. Determine physical properties and particulate sizes of material.
  2. Determine physical and chemical changes from combining material.
  3. Determine the change in energy from combining material.

Safety for this lab:

  • Wear safety glasses at all times.
  • ALWAYS clean up your entire station and any spills made at shared stations.
  • DO NOT deposit broken glassware in trash, place into broken glassware container located near paper towels.

Part 1: Determine physical properties and particulate sizes of material

On the iPad, the following mobile apps will be used:

EMD PTE

EMD PTE

Molecules App

Nice Molecules

ionic

Ionic Bonding

  

 

 

 

 

 

Material 1: Magnesium

  • Using the Camera on the iPad, take a photo of a sample of magnesium.
  • Open the EMD PTE App on the iPad and click on the element Mg (click Basic Information) to fill in the Data Sheet information on magnesium.
  • Set up the Bunsen Burner and using Tongs, safely ignite a sample of magnesium, keeping all burning inside the fume hood (do not look directly at the burning magnesium as it produces a very bright light). Using the iPad Camera, have your lab partner record a short video of magnesium burning (keep iPad outside of the fume hood behind glass shield).

Material 2: Lithium chloride

  • Using the Camera on the iPad, take a photo of a sample of solid lithium chloride.
  • Open the Ionic Bonding App on the iPad and take a screenshot of the compound lithium chloride.
  • Go to the website Wikipedia on the iPad and type in “lithium chloride” to fill in the Data Sheet information on lithium chloride.
  • Using the Bunsen Burner, burn the wooden stick that is soaking in the lithium chloride solution. Using the iPad Camera, have your lab partner record the video of burning stick of lithium chloride solution burning (keep iPad outside of the fume hood behind glass shield).

Material 3: Methane

  • The gas coming out of your Bunsen burner is methane gas. Using the Camera on the iPad, take a short video of your lit Bunsen burner because methane is the gas (keep iPad outside of the fume hood behind glass shield).
  • Open the Nice Molecules App on the iPad and take a screenshot of the compound methane.
  • Hit the “i” in the Nice Molecules app for the methane to fill in the Data Sheet information on methane.

Part 2: Determine physical and chemical changes from combining material.

Combination 1: Corn Starch and Water

l01_18l01_20

  • Place a small amount of corn starch into a small beaker and add just enough water to get all the corn starch completely wet.
  • Using a METAL spatula mix (this should be difficult). You may place this substance into your hands and mold into a ball. This can be a bit messy but fun.
  • Using the Camera on the iPad, take a short video of this
  • combination.
  • On the Data Sheet determine if this is a physical or chemical change.
  • Do not rinse this down the sink. Discard this in the trash.

Combination 2: Baking Soda and Vinegar

  • l01_13 l01_15 l01_17Place a scoop of baking soda into a balloon using a plastic funnel (you will find this in the top cabinet at your station).
  • Fill a 125 mL Erlenmeyer flask with approximately 50 mL of vinegar.
  • Carefully place the balloon over the lid of the Erlenmeyer flask. Don’t let any baking soda fall into the vinegar yet.
  • Using the camera on the iPad have your lab partner record as you tip the balloon up and allow the baking soda to mix with the vinegar.
  • On the Data Sheet determine if this is a physical or chemical change.

Combination 3: Sodium Polyacrylate and Water

  • l01_21Place a small amount of sodium polyacrylate into the palm of your hand.
  • Using the Camera on the iPad have your lab partner record as you add water to the sodium polyacrylate that you have in the palm of your hand. Keep adding as much water as your palm can hold.
  • On the Data Sheet try to explain why this is a physical change.

 

Part 3: Determine the change in energy from combining material.

Combination 4: Magnesium and Hydrochloric Acid

WARNING: Do this procedure under the fume hood, wearing lab goggles!

  • l01_30l01_29Fill the test tube 1/4 filled with hydrochloric acid and measure the temperature with a thermometer, record on Data Sheet.
  • Place the test tube containing the hydrochloric acid safely in a test tube rack or beaker INSIDE the fume hood. Do not want to hold this with your hands for the remaining steps.
  • Remove the thermometer and add a small scoop of magnesium to the hydrochloric acid in the test tube, making sure the opening of the test tube is facing away from you.
  • After the reaction (bubbling) has ended, measure the temperature again with the thermometer, record on Data Sheet.
  • On the Data Sheet explain why this is a chemical change.

FINAL STEP: CLEAN YOUR STATION  

  • Use the sinks and soap to wash your glassware.  
  • PUT AWAY ALL EQUIPMENT AND CHEMICALS AND WIPE DOWN YOUR STATION.
  • Do not leave the lab until the instructor has inspected your clean station.