|
|
|
|
|
|
Posted: Mon Aug 28, 2006 3:46 pm
|
|
|
|
|
|
|
Posted: Mon Aug 28, 2006 9:09 pm
|
|
|
|
|
|
|
|
|
Posted: Sat Sep 02, 2006 2:57 pm
|
|
|
|
|
|
|
Posted: Sat Sep 02, 2006 7:54 pm
|
|
|
|
|
|
|
|
|
Posted: Sun Sep 03, 2006 4:54 pm
|
|
|
|
|
|
|
Posted: Sun Sep 03, 2006 6:12 pm
|
|
|
|
|
|
|
|
|
Posted: Sun Sep 03, 2006 6:21 pm
|
|
|
|
|
|
|
Posted: Sun Sep 03, 2006 8:30 pm
|
|
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 10:28 am
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 6:08 pm
|
|
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 7:50 pm
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 7:54 pm
|
|
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 7:59 pm
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 8:10 pm
|
|
|
|
|
|
|
|
|
Posted: Mon Sep 04, 2006 8:32 pm
|
|
|
|
What I have so far (as converted from Word):
Title: Keeping Track of Matter
Names: Christina, Morgan, Leah, Jennie, Andrew
Abstract: For our first reaction with the magnesium, we placed 2 inches of magnesium in a crucible then placed it over a blue flame. In the second reaction, we placed 2 inches of copper in nitric acid on a hot plate. Our end results were that the outside of the magnesium had turned into white ash while the inside turned black, and the copper had disappeared and the nitric acid remained in its new blue form.
Purpose: Study chemical reactions and see what happens to matter during chemical reactions.
Materials: 2 inches of magnesium, 2 inches of copper, a crucible, a clay triangle, a ring, a ring stand, a Bunsen burner, gas, a beaker, a piece of tape for a label, 20 mL of 3M nitric acid, a hot plate, a fume hood, and one scale.
Procedure:
First Reaction: 1. Obtain the required piece of magnesium. 2. Place the piece of magnesium into a crucible. 3. Measure and record the mass of the crucible and magnesium. 4. Place the crucible on a clay triangle on a ring attached to a ring stand. 5. Place a Bunsen burner under the crucible and light it. 6. Adjust the ring so the bottom of the crucible is in the hottest part of the flame. 7. Wait until a chemical reaction occurs. 8. After the chemical reaction is complete, turn off the flame. 9. Let the crucible and product of the reaction cool until it can be safely handled. 10. Measure and record the mass of the crucible and product.
Second Reaction: 1. Obtain the required piece of copper. 2. Place the piece of copper into a reasonably sized labeled beaker. 3. Measure and record the mass of the beaker. 4. Measure and record the mass of the beaker and copper. 5. Remove the copper. 6. Measure 20 mL of 3M nitric acid into the beaker. 7. Measure and record the mass of the beaker and nitric acid. 8. Place the beaker into the fume hood and onto the hot plate. 9. Add the copper to the beaker. 10. Wait until chemical reaction occurs. 11. After the chemical reaction is complete, remove the beaker from the hot plate. 12. Let beaker and its contents cool until it can be safely handled. 13. Measure and record the mass of the beaker and its contents.
Data: Mass of… Mass in grams Crucible and magnesium 20.91 Crucible and product 20.95 Beaker 51.12 Beaker and copper 51.37 Beaker and nitric acid 71.67 Beaker and contents 118.01
Analysis: Using magnesium and copper, my group measured the masses of several objects in their difference forms, turned magnesium from silver to white, and found that copper disappears when it’s heated in nitric acid. For our first reaction with the magnesium, we placed 2 inches of magnesium in a crucible then placed it over a blue flame. After a few minutes, there was a light orange light radiating from the crucible; the outside of the magnesium had turned into white ash while the inside turned black. In the second reaction, when the 2 inches of copper was placed in nitric acid on a hot plate, it changed from clear to teal to blue, and then the nitric acid started to bubble and fizz. The end result was that the copper had disappeared, and the nitric acid remained in its new blue form.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|